diff --git a/packages/playwright-test/src/cli.ts b/packages/playwright-test/src/cli.ts
index 46c577547f..51b1bc2610 100644
--- a/packages/playwright-test/src/cli.ts
+++ b/packages/playwright-test/src/cli.ts
@@ -23,10 +23,12 @@ import { Runner } from './runner/runner';
 import { stopProfiling, startProfiling } from 'playwright-core/lib/utils';
 import { experimentalLoaderOption, fileIsModule } from './util';
 import { showHTMLReport } from './reporters/html';
-import { baseFullConfig, builtInReporters, ConfigLoader, defaultTimeout, kDefaultConfigFiles, resolveConfigFile } from './common/configLoader';
-import type { TraceMode } from './common/types';
+import { ConfigLoader, kDefaultConfigFiles, resolveConfigFile } from './common/configLoader';
 import type { ConfigCLIOverrides } from './common/ipc';
 import type { FullResult } from '../reporter';
+import type { TraceMode } from '../types/test';
+import { baseFullConfig, builtInReporters, defaultTimeout } from './common/config';
+import type { FullConfigInternal } from './common/config';
 
 export function addTestCommands(program: Command) {
   addTestCommand(program);
@@ -127,20 +129,18 @@ async function runTests(args: string[], opts: { [key: string]: any }) {
     return;
 
   const configLoader = new ConfigLoader(overrides);
+  let config: FullConfigInternal;
   if (resolvedConfigFile)
-    await configLoader.loadConfigFile(resolvedConfigFile);
+    config = await configLoader.loadConfigFile(resolvedConfigFile, opts.deps === false);
   else
-    await configLoader.loadEmptyConfig(configFileOrDirectory);
-  if (opts.deps === false)
-    configLoader.ignoreProjectDependencies();
+    config = await configLoader.loadEmptyConfig(configFileOrDirectory);
 
-  const config = configLoader.fullConfig();
-  config._internal.cliArgs = args;
-  config._internal.cliGrep = opts.grep as string | undefined;
-  config._internal.cliGrepInvert = opts.grepInvert as string | undefined;
-  config._internal.listOnly = !!opts.list;
-  config._internal.cliProjectFilter = opts.project || undefined;
-  config._internal.passWithNoTests = !!opts.passWithNoTests;
+  config.cliArgs = args;
+  config.cliGrep = opts.grep as string | undefined;
+  config.cliGrepInvert = opts.grepInvert as string | undefined;
+  config.listOnly = !!opts.list;
+  config.cliProjectFilter = opts.project || undefined;
+  config.passWithNoTests = !!opts.passWithNoTests;
 
   const runner = new Runner(config);
   let status: FullResult['status'];
@@ -166,8 +166,8 @@ async function listTestFiles(opts: { [key: string]: any }) {
     return;
 
   const configLoader = new ConfigLoader();
-  const runner = new Runner(configLoader.fullConfig());
-  await configLoader.loadConfigFile(resolvedConfigFile);
+  const config = await configLoader.loadConfigFile(resolvedConfigFile);
+  const runner = new Runner(config);
   const report = await runner.listTestFiles(opts.project);
   write(JSON.stringify(report), () => {
     process.exit(0);
diff --git a/packages/playwright-test/src/common/config.ts b/packages/playwright-test/src/common/config.ts
new file mode 100644
index 0000000000..b6ad4ed3f7
--- /dev/null
+++ b/packages/playwright-test/src/common/config.ts
@@ -0,0 +1,255 @@
+/**
+ * Copyright Microsoft Corporation. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import path from 'path';
+import os from 'os';
+import type { Config, Fixtures, Project, ReporterDescription } from '../../types/test';
+import type { Location } from '../../types/testReporter';
+import type { TestRunnerPluginRegistration } from '../plugins';
+import type { Matcher } from '../util';
+import { mergeObjects } from '../util';
+import type { ConfigCLIOverrides } from './ipc';
+import type { FullConfig, FullProject } from '../../types/test';
+
+export type FixturesWithLocation = {
+  fixtures: Fixtures;
+  location: Location;
+};
+export type Annotation = { type: string, description?: string };
+
+export const defaultTimeout = 30000;
+
+export class FullConfigInternal {
+  readonly config: FullConfig;
+  globalOutputDir = path.resolve(process.cwd());
+  configDir = '';
+  configCLIOverrides: ConfigCLIOverrides = {};
+  storeDir = '';
+  maxConcurrentTestGroups = 0;
+  ignoreSnapshots = false;
+  webServers: Exclude<FullConfig['webServer'], null>[] = [];
+  plugins: TestRunnerPluginRegistration[] = [];
+  listOnly = false;
+  cliArgs: string[] = [];
+  cliGrep: string | undefined;
+  cliGrepInvert: string | undefined;
+  cliProjectFilter?: string[];
+  testIdMatcher?: Matcher;
+  passWithNoTests?: boolean;
+  defineConfigWasUsed = false;
+  projects: FullProjectInternal[] = [];
+
+  static from(config: FullConfig): FullConfigInternal {
+    return (config as any)[configInternalSymbol];
+  }
+
+  constructor(configDir: string, configFile: string | undefined, config: Config, throwawayArtifactsPath: string) {
+    this.configDir = configDir;
+    this.config = { ...baseFullConfig };
+    (this.config as any)[configInternalSymbol] = this;
+    this.storeDir = path.resolve(configDir, (config as any)._storeDir || 'playwright');
+    this.globalOutputDir = takeFirst(config.outputDir, throwawayArtifactsPath, path.resolve(process.cwd()));
+    this.ignoreSnapshots = takeFirst(config.ignoreSnapshots, false);
+    this.plugins = ((config as any)._plugins || []).map((p: any) => ({ factory: p }));
+
+    this.config.configFile = configFile;
+    this.config.rootDir = config.testDir || configDir;
+    this.config.forbidOnly = takeFirst(config.forbidOnly, baseFullConfig.forbidOnly);
+    this.config.fullyParallel = takeFirst(config.fullyParallel, baseFullConfig.fullyParallel);
+    this.config.globalSetup = takeFirst(config.globalSetup, baseFullConfig.globalSetup);
+    this.config.globalTeardown = takeFirst(config.globalTeardown, baseFullConfig.globalTeardown);
+    this.config.globalTimeout = takeFirst(config.globalTimeout, baseFullConfig.globalTimeout);
+    this.config.grep = takeFirst(config.grep, baseFullConfig.grep);
+    this.config.grepInvert = takeFirst(config.grepInvert, baseFullConfig.grepInvert);
+    this.config.maxFailures = takeFirst(config.maxFailures, baseFullConfig.maxFailures);
+    this.config.preserveOutput = takeFirst(config.preserveOutput, baseFullConfig.preserveOutput);
+    this.config.reporter = takeFirst(resolveReporters(config.reporter, configDir), baseFullConfig.reporter);
+    this.config.reportSlowTests = takeFirst(config.reportSlowTests, baseFullConfig.reportSlowTests);
+    this.config.quiet = takeFirst(config.quiet, baseFullConfig.quiet);
+    this.config.shard = takeFirst(config.shard, baseFullConfig.shard);
+    this.config.updateSnapshots = takeFirst(config.updateSnapshots, baseFullConfig.updateSnapshots);
+
+    const workers = takeFirst(config.workers, '50%');
+    if (typeof workers === 'string') {
+      if (workers.endsWith('%')) {
+        const cpus = os.cpus().length;
+        this.config.workers = Math.max(1, Math.floor(cpus * (parseInt(workers, 10) / 100)));
+      } else {
+        this.config.workers = parseInt(workers, 10);
+      }
+    } else {
+      this.config.workers = workers;
+    }
+
+    const webServers = takeFirst(config.webServer, baseFullConfig.webServer);
+    if (Array.isArray(webServers)) { // multiple web server mode
+      // Due to previous choices, this value shows up to the user in globalSetup as part of FullConfig. Arrays are not supported by the old type.
+      this.config.webServer = null;
+      this.webServers = webServers;
+    } else if (webServers) { // legacy singleton mode
+      this.config.webServer = webServers;
+      this.webServers = [webServers];
+    }
+    this.config.metadata = takeFirst(config.metadata, baseFullConfig.metadata);
+    this.projects = (config.projects || [config]).map(p => this._resolveProject(config, p, throwawayArtifactsPath));
+    resolveProjectDependencies(this.projects);
+    this._assignUniqueProjectIds(this.projects);
+    this.config.projects = this.projects.map(p => p.project);
+  }
+
+  private _assignUniqueProjectIds(projects: FullProjectInternal[]) {
+    const usedNames = new Set();
+    for (const p of projects) {
+      const name = p.project.name || '';
+      for (let i = 0; i < projects.length; ++i) {
+        const candidate = name + (i ? i : '');
+        if (usedNames.has(candidate))
+          continue;
+        p.id = candidate;
+        usedNames.add(candidate);
+        break;
+      }
+    }
+  }
+
+  private _resolveProject(config: Config, projectConfig: Project, throwawayArtifactsPath: string): FullProjectInternal {
+    // Resolve all config dirs relative to configDir.
+    if (projectConfig.testDir !== undefined)
+      projectConfig.testDir = path.resolve(this.configDir, projectConfig.testDir);
+    if (projectConfig.outputDir !== undefined)
+      projectConfig.outputDir = path.resolve(this.configDir, projectConfig.outputDir);
+    if (projectConfig.snapshotDir !== undefined)
+      projectConfig.snapshotDir = path.resolve(this.configDir, projectConfig.snapshotDir);
+    return new FullProjectInternal(config, this, projectConfig, throwawayArtifactsPath);
+  }
+}
+
+export class FullProjectInternal {
+  readonly project: FullProject;
+  id = '';
+  fullConfig: FullConfigInternal;
+  fullyParallel: boolean;
+  expect: Project['expect'];
+  respectGitIgnore: boolean;
+  deps: FullProjectInternal[] = [];
+  snapshotPathTemplate: string;
+
+  static from(project: FullProject): FullProjectInternal {
+    return (project as any)[projectInternalSymbol];
+  }
+
+  constructor(config: Config, fullConfig: FullConfigInternal, projectConfig: Project, throwawayArtifactsPath: string) {
+    this.fullConfig = fullConfig;
+
+    const testDir = takeFirst(projectConfig.testDir, config.testDir, fullConfig.configDir);
+
+    const outputDir = takeFirst(projectConfig.outputDir, config.outputDir, path.join(throwawayArtifactsPath, 'test-results'));
+    const snapshotDir = takeFirst(projectConfig.snapshotDir, config.snapshotDir, testDir);
+    const name = takeFirst(projectConfig.name, config.name, '');
+
+    const defaultSnapshotPathTemplate = '{snapshotDir}/{testFileDir}/{testFileName}-snapshots/{arg}{-projectName}{-snapshotSuffix}{ext}';
+    this.snapshotPathTemplate = takeFirst(projectConfig.snapshotPathTemplate, config.snapshotPathTemplate, defaultSnapshotPathTemplate);
+
+    this.project = {
+      grep: takeFirst(projectConfig.grep, config.grep, baseFullConfig.grep),
+      grepInvert: takeFirst(projectConfig.grepInvert, config.grepInvert, baseFullConfig.grepInvert),
+      outputDir,
+      repeatEach: takeFirst(projectConfig.repeatEach, config.repeatEach, 1),
+      retries: takeFirst(projectConfig.retries, config.retries, 0),
+      metadata: takeFirst(projectConfig.metadata, config.metadata, undefined),
+      name,
+      testDir,
+      snapshotDir,
+      testIgnore: takeFirst(projectConfig.testIgnore, config.testIgnore, []),
+      testMatch: takeFirst(projectConfig.testMatch, config.testMatch, '**/?(*.)@(spec|test).?(m)[jt]s?(x)'),
+      timeout: takeFirst(projectConfig.timeout, config.timeout, defaultTimeout),
+      use: mergeObjects(config.use, projectConfig.use),
+      dependencies: projectConfig.dependencies || [],
+    };
+    (this.project as any)[projectInternalSymbol] = this;
+    this.fullyParallel = takeFirst(projectConfig.fullyParallel, config.fullyParallel, undefined);
+    this.expect = takeFirst(projectConfig.expect, config.expect, {});
+    this.respectGitIgnore = !projectConfig.testDir && !config.testDir;
+  }
+}
+
+export const baseFullConfig: FullConfig = {
+  forbidOnly: false,
+  fullyParallel: false,
+  globalSetup: null,
+  globalTeardown: null,
+  globalTimeout: 0,
+  grep: /.*/,
+  grepInvert: null,
+  maxFailures: 0,
+  metadata: {},
+  preserveOutput: 'always',
+  projects: [],
+  reporter: [[process.env.CI ? 'dot' : 'list']],
+  reportSlowTests: { max: 5, threshold: 15000 },
+  rootDir: path.resolve(process.cwd()),
+  quiet: false,
+  shard: null,
+  updateSnapshots: 'missing',
+  version: require('../../package.json').version,
+  workers: 0,
+  webServer: null,
+};
+
+export function takeFirst<T>(...args: (T | undefined)[]): T {
+  for (const arg of args) {
+    if (arg !== undefined)
+      return arg;
+  }
+  return undefined as any as T;
+}
+
+function resolveReporters(reporters: Config['reporter'], rootDir: string): ReporterDescription[] | undefined {
+  return toReporters(reporters as any)?.map(([id, arg]) => {
+    if (builtInReporters.includes(id as any))
+      return [id, arg];
+    return [require.resolve(id, { paths: [rootDir] }), arg];
+  });
+}
+
+function resolveProjectDependencies(projects: FullProjectInternal[]) {
+  for (const project of projects) {
+    for (const dependencyName of project.project.dependencies) {
+      const dependencies = projects.filter(p => p.project.name === dependencyName);
+      if (!dependencies.length)
+        throw new Error(`Project '${project.project.name}' depends on unknown project '${dependencyName}'`);
+      if (dependencies.length > 1)
+        throw new Error(`Project dependencies should have unique names, reading ${dependencyName}`);
+      project.deps.push(...dependencies);
+    }
+  }
+}
+
+export function toReporters(reporters: BuiltInReporter | ReporterDescription[] | undefined): ReporterDescription[] | undefined {
+  if (!reporters)
+    return;
+  if (typeof reporters === 'string')
+    return [[reporters]];
+  return reporters;
+}
+
+export const builtInReporters = ['list', 'line', 'dot', 'json', 'junit', 'null', 'github', 'html'] as const;
+export type BuiltInReporter = typeof builtInReporters[number];
+
+export type ContextReuseMode = 'none' | 'force' | 'when-possible';
+
+const configInternalSymbol = Symbol('configInternalSymbol');
+const projectInternalSymbol = Symbol('projectInternalSymbol');
diff --git a/packages/playwright-test/src/common/configLoader.ts b/packages/playwright-test/src/common/configLoader.ts
index 8f05fa31a5..db488838ff 100644
--- a/packages/playwright-test/src/common/configLoader.ts
+++ b/packages/playwright-test/src/common/configLoader.ts
@@ -15,16 +15,14 @@
  */
 
 import * as fs from 'fs';
-import * as os from 'os';
 import * as path from 'path';
 import { isRegExp } from 'playwright-core/lib/utils';
 import type { ConfigCLIOverrides, SerializedConfig } from './ipc';
 import { requireOrImport } from './transform';
-import type { Config, FullConfigInternal, FullProjectInternal, Project, ReporterDescription } from './types';
+import type { Config, Project } from '../../types/test';
 import { errorWithFile, getPackageJsonPath, mergeObjects } from '../util';
 import { setCurrentConfig } from './globals';
-
-export const defaultTimeout = 30000;
+import { FullConfigInternal, takeFirst, toReporters } from './config';
 
 const kDefineConfigWasUsed = Symbol('defineConfigWasUsed');
 export const defineConfig = (config: any) => {
@@ -33,62 +31,64 @@ export const defineConfig = (config: any) => {
 };
 
 export class ConfigLoader {
-  private _fullConfig: FullConfigInternal;
+  private _configCLIOverrides: ConfigCLIOverrides;
+  private _fullConfig: FullConfigInternal | undefined;
 
   constructor(configCLIOverrides?: ConfigCLIOverrides) {
-    this._fullConfig = { ...baseFullConfig };
-    this._fullConfig._internal.configCLIOverrides = configCLIOverrides || {};
+    this._configCLIOverrides = configCLIOverrides || {};
   }
 
-  static async deserialize(data: SerializedConfig): Promise<ConfigLoader> {
+  static async deserialize(data: SerializedConfig): Promise<FullConfigInternal> {
     const loader = new ConfigLoader(data.configCLIOverrides);
     if (data.configFile)
-      await loader.loadConfigFile(data.configFile);
-    else
-      await loader.loadEmptyConfig(data.configDir);
-    return loader;
+      return await loader.loadConfigFile(data.configFile);
+    return await loader.loadEmptyConfig(data.configDir);
   }
 
-  async loadConfigFile(file: string): Promise<FullConfigInternal> {
-    if (this._fullConfig.configFile)
+  async loadConfigFile(file: string, ignoreProjectDependencies = false): Promise<FullConfigInternal> {
+    if (this._fullConfig)
       throw new Error('Cannot load two config files');
     const config = await requireOrImportDefaultObject(file) as Config;
-    await this._processConfigObject(config, path.dirname(file), file);
-    setCurrentConfig(this._fullConfig);
-    return this._fullConfig;
+    const fullConfig = await this._loadConfig(config, path.dirname(file), file);
+    setCurrentConfig(fullConfig);
+    if (ignoreProjectDependencies) {
+      for (const project of fullConfig.projects)
+        project.deps = [];
+    }
+    this._fullConfig = fullConfig;
+    return fullConfig;
   }
 
-  async loadEmptyConfig(configDir: string): Promise<Config> {
-    await this._processConfigObject({}, configDir);
-    setCurrentConfig(this._fullConfig);
-    return {};
+  async loadEmptyConfig(configDir: string): Promise<FullConfigInternal> {
+    const fullConfig = await this._loadConfig({}, configDir);
+    setCurrentConfig(fullConfig);
+    return fullConfig;
   }
 
-  private async _processConfigObject(config: Config, configDir: string, configFile?: string) {
+  private async _loadConfig(config: Config, configDir: string, configFile?: string): Promise<FullConfigInternal> {
     // 1. Validate data provided in the config file.
     validateConfig(configFile || '<default config>', config);
 
     // 2. Override settings from CLI.
-    const configCLIOverrides = this._fullConfig._internal.configCLIOverrides;
-    config.forbidOnly = takeFirst(configCLIOverrides.forbidOnly, config.forbidOnly);
-    config.fullyParallel = takeFirst(configCLIOverrides.fullyParallel, config.fullyParallel);
-    config.globalTimeout = takeFirst(configCLIOverrides.globalTimeout, config.globalTimeout);
-    config.maxFailures = takeFirst(configCLIOverrides.maxFailures, config.maxFailures);
-    config.outputDir = takeFirst(configCLIOverrides.outputDir, config.outputDir);
-    config.quiet = takeFirst(configCLIOverrides.quiet, config.quiet);
-    config.repeatEach = takeFirst(configCLIOverrides.repeatEach, config.repeatEach);
-    config.retries = takeFirst(configCLIOverrides.retries, config.retries);
-    if (configCLIOverrides.reporter)
-      config.reporter = toReporters(configCLIOverrides.reporter as any);
-    config.shard = takeFirst(configCLIOverrides.shard, config.shard);
-    config.timeout = takeFirst(configCLIOverrides.timeout, config.timeout);
-    config.updateSnapshots = takeFirst(configCLIOverrides.updateSnapshots, config.updateSnapshots);
-    config.ignoreSnapshots = takeFirst(configCLIOverrides.ignoreSnapshots, config.ignoreSnapshots);
-    if (configCLIOverrides.projects && config.projects)
+    config.forbidOnly = takeFirst(this._configCLIOverrides.forbidOnly, config.forbidOnly);
+    config.fullyParallel = takeFirst(this._configCLIOverrides.fullyParallel, config.fullyParallel);
+    config.globalTimeout = takeFirst(this._configCLIOverrides.globalTimeout, config.globalTimeout);
+    config.maxFailures = takeFirst(this._configCLIOverrides.maxFailures, config.maxFailures);
+    config.outputDir = takeFirst(this._configCLIOverrides.outputDir, config.outputDir);
+    config.quiet = takeFirst(this._configCLIOverrides.quiet, config.quiet);
+    config.repeatEach = takeFirst(this._configCLIOverrides.repeatEach, config.repeatEach);
+    config.retries = takeFirst(this._configCLIOverrides.retries, config.retries);
+    if (this._configCLIOverrides.reporter)
+      config.reporter = toReporters(this._configCLIOverrides.reporter as any);
+    config.shard = takeFirst(this._configCLIOverrides.shard, config.shard);
+    config.timeout = takeFirst(this._configCLIOverrides.timeout, config.timeout);
+    config.updateSnapshots = takeFirst(this._configCLIOverrides.updateSnapshots, config.updateSnapshots);
+    config.ignoreSnapshots = takeFirst(this._configCLIOverrides.ignoreSnapshots, config.ignoreSnapshots);
+    if (this._configCLIOverrides.projects && config.projects)
       throw new Error(`Cannot use --browser option when configuration file defines projects. Specify browserName in the projects instead.`);
-    config.projects = takeFirst(configCLIOverrides.projects, config.projects as any);
-    config.workers = takeFirst(configCLIOverrides.workers, config.workers);
-    config.use = mergeObjects(config.use, configCLIOverrides.use);
+    config.projects = takeFirst(this._configCLIOverrides.projects, config.projects as any);
+    config.workers = takeFirst(this._configCLIOverrides.workers, config.workers);
+    config.use = mergeObjects(config.use, this._configCLIOverrides.use);
     for (const project of config.projects || [])
       this._applyCLIOverridesToProject(project);
 
@@ -110,134 +110,19 @@ export class ConfigLoader {
     if (config.snapshotDir !== undefined)
       config.snapshotDir = path.resolve(configDir, config.snapshotDir);
 
-    this._fullConfig._internal.configDir = configDir;
-    this._fullConfig._internal.storeDir = path.resolve(configDir, (config as any)._storeDir || 'playwright');
-    this._fullConfig.configFile = configFile;
-    this._fullConfig.rootDir = config.testDir || configDir;
-    this._fullConfig._internal.globalOutputDir = takeFirst(config.outputDir, throwawayArtifactsPath, baseFullConfig._internal.globalOutputDir);
-    this._fullConfig.forbidOnly = takeFirst(config.forbidOnly, baseFullConfig.forbidOnly);
-    this._fullConfig.fullyParallel = takeFirst(config.fullyParallel, baseFullConfig.fullyParallel);
-    this._fullConfig.globalSetup = takeFirst(config.globalSetup, baseFullConfig.globalSetup);
-    this._fullConfig.globalTeardown = takeFirst(config.globalTeardown, baseFullConfig.globalTeardown);
-    this._fullConfig.globalTimeout = takeFirst(config.globalTimeout, baseFullConfig.globalTimeout);
-    this._fullConfig.grep = takeFirst(config.grep, baseFullConfig.grep);
-    this._fullConfig.grepInvert = takeFirst(config.grepInvert, baseFullConfig.grepInvert);
-    this._fullConfig.maxFailures = takeFirst(config.maxFailures, baseFullConfig.maxFailures);
-    this._fullConfig.preserveOutput = takeFirst(config.preserveOutput, baseFullConfig.preserveOutput);
-    this._fullConfig.reporter = takeFirst(resolveReporters(config.reporter, configDir), baseFullConfig.reporter);
-    this._fullConfig.reportSlowTests = takeFirst(config.reportSlowTests, baseFullConfig.reportSlowTests);
-    this._fullConfig.quiet = takeFirst(config.quiet, baseFullConfig.quiet);
-    this._fullConfig.shard = takeFirst(config.shard, baseFullConfig.shard);
-    this._fullConfig._internal.ignoreSnapshots = takeFirst(config.ignoreSnapshots, baseFullConfig._internal.ignoreSnapshots);
-    this._fullConfig.updateSnapshots = takeFirst(config.updateSnapshots, baseFullConfig.updateSnapshots);
-    this._fullConfig._internal.plugins = ((config as any)._plugins || []).map((p: any) => ({ factory: p }));
-    this._fullConfig._internal.defineConfigWasUsed = !!(config as any)[kDefineConfigWasUsed];
-
-    const workers = takeFirst(config.workers, '50%');
-    if (typeof workers === 'string') {
-      if (workers.endsWith('%')) {
-        const cpus = os.cpus().length;
-        this._fullConfig.workers = Math.max(1, Math.floor(cpus * (parseInt(workers, 10) / 100)));
-      } else {
-        this._fullConfig.workers = parseInt(workers, 10);
-      }
-    } else {
-      this._fullConfig.workers = workers;
-    }
-
-    const webServers = takeFirst(config.webServer, baseFullConfig.webServer);
-    if (Array.isArray(webServers)) { // multiple web server mode
-      // Due to previous choices, this value shows up to the user in globalSetup as part of FullConfig. Arrays are not supported by the old type.
-      this._fullConfig.webServer = null;
-      this._fullConfig._internal.webServers = webServers;
-    } else if (webServers) { // legacy singleton mode
-      this._fullConfig.webServer = webServers;
-      this._fullConfig._internal.webServers = [webServers];
-    }
-    this._fullConfig.metadata = takeFirst(config.metadata, baseFullConfig.metadata);
-    this._fullConfig.projects = (config.projects || [config]).map(p => this._resolveProject(config, this._fullConfig, p, throwawayArtifactsPath));
-
-    resolveProjectDependencies(this._fullConfig.projects);
-    this._assignUniqueProjectIds(this._fullConfig.projects);
-  }
-
-  ignoreProjectDependencies() {
-    for (const project of this._fullConfig.projects)
-      project._internal.deps = [];
-  }
-
-  private _assignUniqueProjectIds(projects: FullProjectInternal[]) {
-    const usedNames = new Set();
-    for (const p of projects) {
-      const name = p.name || '';
-      for (let i = 0; i < projects.length; ++i) {
-        const candidate = name + (i ? i : '');
-        if (usedNames.has(candidate))
-          continue;
-        p._internal.id = candidate;
-        usedNames.add(candidate);
-        break;
-      }
-    }
-  }
-
-  fullConfig(): FullConfigInternal {
-    return this._fullConfig;
+    const fullConfig = new FullConfigInternal(configDir, configFile, config, throwawayArtifactsPath);
+    fullConfig.defineConfigWasUsed = !!(config as any)[kDefineConfigWasUsed];
+    fullConfig.configCLIOverrides = this._configCLIOverrides;
+    return fullConfig;
   }
 
   private _applyCLIOverridesToProject(projectConfig: Project) {
-    const configCLIOverrides = this._fullConfig._internal.configCLIOverrides;
-    projectConfig.fullyParallel = takeFirst(configCLIOverrides.fullyParallel, projectConfig.fullyParallel);
-    projectConfig.outputDir = takeFirst(configCLIOverrides.outputDir, projectConfig.outputDir);
-    projectConfig.repeatEach = takeFirst(configCLIOverrides.repeatEach, projectConfig.repeatEach);
-    projectConfig.retries = takeFirst(configCLIOverrides.retries, projectConfig.retries);
-    projectConfig.timeout = takeFirst(configCLIOverrides.timeout, projectConfig.timeout);
-    projectConfig.use = mergeObjects(projectConfig.use, configCLIOverrides.use);
-  }
-
-  private _resolveProject(config: Config, fullConfig: FullConfigInternal, projectConfig: Project, throwawayArtifactsPath: string): FullProjectInternal {
-    // Resolve all config dirs relative to configDir.
-    if (projectConfig.testDir !== undefined)
-      projectConfig.testDir = path.resolve(fullConfig._internal.configDir, projectConfig.testDir);
-    if (projectConfig.outputDir !== undefined)
-      projectConfig.outputDir = path.resolve(fullConfig._internal.configDir, projectConfig.outputDir);
-    if (projectConfig.snapshotDir !== undefined)
-      projectConfig.snapshotDir = path.resolve(fullConfig._internal.configDir, projectConfig.snapshotDir);
-
-    const testDir = takeFirst(projectConfig.testDir, config.testDir, fullConfig._internal.configDir);
-    const respectGitIgnore = !projectConfig.testDir && !config.testDir;
-
-    const outputDir = takeFirst(projectConfig.outputDir, config.outputDir, path.join(throwawayArtifactsPath, 'test-results'));
-    const snapshotDir = takeFirst(projectConfig.snapshotDir, config.snapshotDir, testDir);
-    const name = takeFirst(projectConfig.name, config.name, '');
-
-    const defaultSnapshotPathTemplate = '{snapshotDir}/{testFileDir}/{testFileName}-snapshots/{arg}{-projectName}{-snapshotSuffix}{ext}';
-    const snapshotPathTemplate = takeFirst(projectConfig.snapshotPathTemplate, config.snapshotPathTemplate, defaultSnapshotPathTemplate);
-    return {
-      _internal: {
-        id: '',
-        fullConfig: fullConfig,
-        fullyParallel: takeFirst(projectConfig.fullyParallel, config.fullyParallel, undefined),
-        expect: takeFirst(projectConfig.expect, config.expect, {}),
-        deps: [],
-        respectGitIgnore: respectGitIgnore,
-      },
-      grep: takeFirst(projectConfig.grep, config.grep, baseFullConfig.grep),
-      grepInvert: takeFirst(projectConfig.grepInvert, config.grepInvert, baseFullConfig.grepInvert),
-      outputDir,
-      repeatEach: takeFirst(projectConfig.repeatEach, config.repeatEach, 1),
-      retries: takeFirst(projectConfig.retries, config.retries, 0),
-      metadata: takeFirst(projectConfig.metadata, config.metadata, undefined),
-      name,
-      testDir,
-      snapshotDir,
-      snapshotPathTemplate,
-      testIgnore: takeFirst(projectConfig.testIgnore, config.testIgnore, []),
-      testMatch: takeFirst(projectConfig.testMatch, config.testMatch, '**/?(*.)@(spec|test).?(m)[jt]s?(x)'),
-      timeout: takeFirst(projectConfig.timeout, config.timeout, defaultTimeout),
-      use: mergeObjects(config.use, projectConfig.use),
-      dependencies: projectConfig.dependencies || [],
-    };
+    projectConfig.fullyParallel = takeFirst(this._configCLIOverrides.fullyParallel, projectConfig.fullyParallel);
+    projectConfig.outputDir = takeFirst(this._configCLIOverrides.outputDir, projectConfig.outputDir);
+    projectConfig.repeatEach = takeFirst(this._configCLIOverrides.repeatEach, projectConfig.repeatEach);
+    projectConfig.retries = takeFirst(this._configCLIOverrides.retries, projectConfig.retries);
+    projectConfig.timeout = takeFirst(this._configCLIOverrides.timeout, projectConfig.timeout);
+    projectConfig.use = mergeObjects(projectConfig.use, this._configCLIOverrides.use);
   }
 }
 
@@ -248,14 +133,6 @@ async function requireOrImportDefaultObject(file: string) {
   return object;
 }
 
-function takeFirst<T>(...args: (T | undefined)[]): T {
-  for (const arg of args) {
-    if (arg !== undefined)
-      return arg;
-  }
-  return undefined as any as T;
-}
-
 function validateConfig(file: string, config: Config) {
   if (typeof config !== 'object' || !config)
     throw errorWithFile(file, `Configuration file must export a single object`);
@@ -428,53 +305,6 @@ function validateProject(file: string, project: Project, title: string) {
   }
 }
 
-export const baseFullConfig: FullConfigInternal = {
-  forbidOnly: false,
-  fullyParallel: false,
-  globalSetup: null,
-  globalTeardown: null,
-  globalTimeout: 0,
-  grep: /.*/,
-  grepInvert: null,
-  maxFailures: 0,
-  metadata: {},
-  preserveOutput: 'always',
-  projects: [],
-  reporter: [[process.env.CI ? 'dot' : 'list']],
-  reportSlowTests: { max: 5, threshold: 15000 },
-  configFile: '',
-  rootDir: path.resolve(process.cwd()),
-  quiet: false,
-  shard: null,
-  updateSnapshots: 'missing',
-  version: require('../../package.json').version,
-  workers: 0,
-  webServer: null,
-  _internal: {
-    webServers: [],
-    globalOutputDir: path.resolve(process.cwd()),
-    configDir: '',
-    configCLIOverrides: {},
-    storeDir: '',
-    maxConcurrentTestGroups: 0,
-    ignoreSnapshots: false,
-    plugins: [],
-    cliArgs: [],
-    cliGrep: undefined,
-    cliGrepInvert: undefined,
-    listOnly: false,
-    defineConfigWasUsed: false,
-  }
-};
-
-function resolveReporters(reporters: Config['reporter'], rootDir: string): ReporterDescription[]|undefined {
-  return toReporters(reporters as any)?.map(([id, arg]) => {
-    if (builtInReporters.includes(id as any))
-      return [id, arg];
-    return [require.resolve(id, { paths: [rootDir] }), arg];
-  });
-}
-
 function resolveScript(id: string, rootDir: string) {
   const localPath = path.resolve(rootDir, id);
   if (fs.existsSync(localPath))
@@ -482,19 +312,6 @@ function resolveScript(id: string, rootDir: string) {
   return require.resolve(id, { paths: [rootDir] });
 }
 
-function resolveProjectDependencies(projects: FullProjectInternal[]) {
-  for (const project of projects) {
-    for (const dependencyName of project.dependencies) {
-      const dependencies = projects.filter(p => p.name === dependencyName);
-      if (!dependencies.length)
-        throw new Error(`Project '${project.name}' depends on unknown project '${dependencyName}'`);
-      if (dependencies.length > 1)
-        throw new Error(`Project dependencies should have unique names, reading ${dependencyName}`);
-      project._internal.deps.push(...dependencies);
-    }
-  }
-}
-
 export const kDefaultConfigFiles = ['playwright.config.ts', 'playwright.config.js', 'playwright.config.mjs'];
 
 export function resolveConfigFile(configFileOrDirectory: string): string | null {
@@ -526,14 +343,3 @@ export function resolveConfigFile(configFileOrDirectory: string): string | null
     return configFile!;
   }
 }
-
-export const builtInReporters = ['list', 'line', 'dot', 'json', 'junit', 'null', 'github', 'html'] as const;
-export type BuiltInReporter = typeof builtInReporters[number];
-
-export function toReporters(reporters: BuiltInReporter | ReporterDescription[] | undefined): ReporterDescription[] | undefined {
-  if (!reporters)
-    return;
-  if (typeof reporters === 'string')
-    return [[reporters]];
-  return reporters;
-}
diff --git a/packages/playwright-test/src/common/fixtures.ts b/packages/playwright-test/src/common/fixtures.ts
index 716b224d9a..4fd298e7cc 100644
--- a/packages/playwright-test/src/common/fixtures.ts
+++ b/packages/playwright-test/src/common/fixtures.ts
@@ -16,7 +16,9 @@
 
 import { formatLocation } from '../util';
 import * as crypto from 'crypto';
-import type { Fixtures, FixturesWithLocation, Location } from './types';
+import type { Fixtures } from '../../types/test';
+import type { Location } from '../../types/testReporter';
+import type { FixturesWithLocation } from './config';
 
 export type FixtureScope = 'test' | 'worker';
 type FixtureAuto = boolean | 'all-hooks-included';
diff --git a/packages/playwright-test/src/common/globals.ts b/packages/playwright-test/src/common/globals.ts
index 2bee5c5a41..fa4821a87b 100644
--- a/packages/playwright-test/src/common/globals.ts
+++ b/packages/playwright-test/src/common/globals.ts
@@ -16,7 +16,8 @@
 
 import type { TestInfoImpl } from '../worker/testInfo';
 import type { Suite } from './test';
-import type { FullConfigInternal } from './types';
+import { FullProjectInternal } from './config';
+import type { FullConfigInternal } from './config';
 
 let currentTestInfoValue: TestInfoImpl | null = null;
 export function setCurrentTestInfo(testInfo: TestInfoImpl | null) {
@@ -38,7 +39,7 @@ export function currentExpectTimeout(options: { timeout?: number }) {
   const testInfo = currentTestInfo();
   if (options.timeout !== undefined)
     return options.timeout;
-  let defaultExpectTimeout = testInfo?.project._internal.expect?.timeout;
+  let defaultExpectTimeout = testInfo?.project ? FullProjectInternal.from(testInfo.project).expect?.timeout : undefined;
   if (typeof defaultExpectTimeout === 'undefined')
     defaultExpectTimeout = 5000;
   return defaultExpectTimeout;
diff --git a/packages/playwright-test/src/common/ipc.ts b/packages/playwright-test/src/common/ipc.ts
index f209e389cb..5e9d6fe1d4 100644
--- a/packages/playwright-test/src/common/ipc.ts
+++ b/packages/playwright-test/src/common/ipc.ts
@@ -15,7 +15,8 @@
  */
 
 import { serializeCompilationCache } from './compilationCache';
-import type { FullConfigInternal, TestInfoError, TestStatus } from './types';
+import type { FullConfigInternal } from './config';
+import type { TestInfoError, TestStatus } from '../../types/test';
 
 export type ConfigCLIOverrides = {
   forbidOnly?: boolean;
@@ -126,9 +127,9 @@ export type EnvProducedPayload = [string, string | null][];
 
 export function serializeConfig(config: FullConfigInternal): SerializedConfig {
   const result: SerializedConfig = {
-    configFile: config.configFile,
-    configDir: config._internal.configDir,
-    configCLIOverrides: config._internal.configCLIOverrides,
+    configFile: config.config.configFile,
+    configDir: config.configDir,
+    configCLIOverrides: config.configCLIOverrides,
     compilationCache: serializeCompilationCache(),
   };
   return result;
diff --git a/packages/playwright-test/src/common/poolBuilder.ts b/packages/playwright-test/src/common/poolBuilder.ts
index 382255bbf8..326f24843b 100644
--- a/packages/playwright-test/src/common/poolBuilder.ts
+++ b/packages/playwright-test/src/common/poolBuilder.ts
@@ -18,7 +18,7 @@ import { FixturePool } from './fixtures';
 import type { LoadError } from './fixtures';
 import type { Suite, TestCase } from './test';
 import type { TestTypeImpl } from './testType';
-import type { FullProjectInternal } from './types';
+import type { FullProjectInternal } from './config';
 import { formatLocation } from '../util';
 import type { TestError } from '../../reporter';
 
@@ -74,8 +74,8 @@ export class PoolBuilder {
   private _buildTestTypePool(testType: TestTypeImpl, testErrors?: TestError[]): FixturePool {
     if (!this._testTypePools.has(testType)) {
       const optionOverrides = {
-        overrides: this._project?.use ?? {},
-        location: { file: `project#${this._project?._internal.id}`, line: 1, column: 1 }
+        overrides: this._project?.project?.use ?? {},
+        location: { file: `project#${this._project?.id}`, line: 1, column: 1 }
       };
       const pool = new FixturePool(testType.fixtures, e => this._handleLoadError(e, testErrors), undefined, undefined, optionOverrides);
       this._testTypePools.set(testType, pool);
diff --git a/packages/playwright-test/src/common/process.ts b/packages/playwright-test/src/common/process.ts
index 8119555202..8b0cd4222b 100644
--- a/packages/playwright-test/src/common/process.ts
+++ b/packages/playwright-test/src/common/process.ts
@@ -17,7 +17,7 @@
 import type { WriteStream } from 'tty';
 import type { EnvProducedPayload, ProcessInitParams, TtyParams } from './ipc';
 import { startProfiling, stopProfiling } from 'playwright-core/lib/utils';
-import type { TestInfoError } from './types';
+import type { TestInfoError } from '../../types/test';
 import { serializeError } from '../util';
 
 export type ProtocolRequest = {
diff --git a/packages/playwright-test/src/common/suiteUtils.ts b/packages/playwright-test/src/common/suiteUtils.ts
index 839e780a04..0247d2a8e4 100644
--- a/packages/playwright-test/src/common/suiteUtils.ts
+++ b/packages/playwright-test/src/common/suiteUtils.ts
@@ -17,7 +17,7 @@
 import path from 'path';
 import { calculateSha1 } from 'playwright-core/lib/utils';
 import type { Suite, TestCase } from './test';
-import type { FullProjectInternal } from './types';
+import type { FullProjectInternal } from './config';
 import type { Matcher, TestFileFilter } from '../util';
 import { createFileMatcher } from '../util';
 
@@ -41,7 +41,7 @@ export function filterTestsRemoveEmptySuites(suite: Suite, filter: (test: TestCa
 }
 
 export function buildFileSuiteForProject(project: FullProjectInternal, suite: Suite, repeatEachIndex: number): Suite {
-  const relativeFile = path.relative(project.testDir, suite.location!.file).split(path.sep).join('/');
+  const relativeFile = path.relative(project.project.testDir, suite.location!.file).split(path.sep).join('/');
   const fileId = calculateSha1(relativeFile).slice(0, 20);
 
   // Clone suite.
@@ -54,11 +54,11 @@ export function buildFileSuiteForProject(project: FullProjectInternal, suite: Su
     const repeatEachIndexSuffix = repeatEachIndex ? ` (repeat:${repeatEachIndex})` : '';
 
     // At the point of the query, suite is not yet attached to the project, so we only get file, describe and test titles.
-    const testIdExpression = `[project=${project._internal.id}]${test.titlePath().join('\x1e')}${repeatEachIndexSuffix}`;
+    const testIdExpression = `[project=${project.id}]${test.titlePath().join('\x1e')}${repeatEachIndexSuffix}`;
     const testId = fileId + '-' + calculateSha1(testIdExpression).slice(0, 20);
     test.id = testId;
     test.repeatEachIndex = repeatEachIndex;
-    test._projectId = project._internal.id;
+    test._projectId = project.id;
 
     // Inherit properties from parent suites.
     let inheritedRetries: number | undefined;
@@ -70,8 +70,8 @@ export function buildFileSuiteForProject(project: FullProjectInternal, suite: Su
       if (inheritedTimeout === undefined && parentSuite._timeout !== undefined)
         inheritedTimeout = parentSuite._timeout;
     }
-    test.retries = inheritedRetries ?? project.retries;
-    test.timeout = inheritedTimeout ?? project.timeout;
+    test.retries = inheritedRetries ?? project.project.retries;
+    test.timeout = inheritedTimeout ?? project.project.timeout;
 
     // Skip annotations imply skipped expectedStatus.
     if (test._staticAnnotations.some(a => a.type === 'skip' || a.type === 'fixme'))
@@ -79,7 +79,7 @@ export function buildFileSuiteForProject(project: FullProjectInternal, suite: Su
 
     // We only compute / set digest in the runner.
     if (test._poolDigest)
-      test._workerHash = `${project._internal.id}-${test._poolDigest}-${repeatEachIndex}`;
+      test._workerHash = `${project.id}-${test._poolDigest}-${repeatEachIndex}`;
   });
 
   return result;
diff --git a/packages/playwright-test/src/common/test.ts b/packages/playwright-test/src/common/test.ts
index b8aaa313c4..fe79121074 100644
--- a/packages/playwright-test/src/common/test.ts
+++ b/packages/playwright-test/src/common/test.ts
@@ -19,7 +19,9 @@ import type * as reporterTypes from '../../types/testReporter';
 import type { SuitePrivate } from '../../types/reporterPrivate';
 import type { TestTypeImpl } from './testType';
 import { rootTestType } from './testType';
-import type { Annotation, FixturesWithLocation, FullProject, FullProjectInternal, Location } from './types';
+import type { Annotation, FixturesWithLocation, FullProjectInternal } from './config';
+import type { FullProject } from '../../types/test';
+import type { Location } from '../../types/testReporter';
 
 class Base {
   title: string;
@@ -197,7 +199,7 @@ export class Suite extends Base implements SuitePrivate {
   }
 
   project(): FullProject | undefined {
-    return this._projectConfig || this.parent?.project();
+    return this._projectConfig?.project || this.parent?.project();
   }
 }
 
diff --git a/packages/playwright-test/src/common/testType.ts b/packages/playwright-test/src/common/testType.ts
index ef02c0fc49..12b630f6de 100644
--- a/packages/playwright-test/src/common/testType.ts
+++ b/packages/playwright-test/src/common/testType.ts
@@ -18,7 +18,9 @@ import { expect } from '../matchers/expect';
 import { currentlyLoadingFileSuite, currentTestInfo, setCurrentlyLoadingFileSuite } from './globals';
 import { TestCase, Suite } from './test';
 import { wrapFunctionWithLocation } from './transform';
-import type { Fixtures, FixturesWithLocation, Location, TestType } from './types';
+import type { FixturesWithLocation } from './config';
+import type { Fixtures, TestType } from '../../types/test';
+import type { Location } from '../../types/testReporter';
 
 const testTypeSymbol = Symbol('testType');
 
diff --git a/packages/playwright-test/src/common/transform.ts b/packages/playwright-test/src/common/transform.ts
index 7bedda954f..cdef485841 100644
--- a/packages/playwright-test/src/common/transform.ts
+++ b/packages/playwright-test/src/common/transform.ts
@@ -18,7 +18,7 @@ import path from 'path';
 import fs from 'fs';
 import { sourceMapSupport, pirates } from '../utilsBundle';
 import url from 'url';
-import type { Location } from './types';
+import type { Location } from '../../types/testReporter';
 import type { TsConfigLoaderResult } from '../third_party/tsconfig-loader';
 import { tsConfigLoader } from '../third_party/tsconfig-loader';
 import Module from 'module';
diff --git a/packages/playwright-test/src/common/types.ts b/packages/playwright-test/src/common/types.ts
deleted file mode 100644
index e3af8e82ab..0000000000
--- a/packages/playwright-test/src/common/types.ts
+++ /dev/null
@@ -1,80 +0,0 @@
-/**
- * Copyright Microsoft Corporation. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import type { Fixtures, Project } from '../../types/test';
-import type { Location } from '../../types/testReporter';
-import type { TestRunnerPluginRegistration } from '../plugins';
-import type { Matcher } from '../util';
-import type { ConfigCLIOverrides } from './ipc';
-import type { FullConfig as FullConfigPublic, FullProject as FullProjectPublic } from './types';
-export * from '../../types/test';
-export type { Location } from '../../types/testReporter';
-
-export type FixturesWithLocation = {
-  fixtures: Fixtures;
-  location: Location;
-};
-export type Annotation = { type: string, description?: string };
-
-type ConfigInternal = {
-  globalOutputDir: string;
-  configDir: string;
-  configCLIOverrides: ConfigCLIOverrides;
-  storeDir: string;
-  maxConcurrentTestGroups: number;
-  ignoreSnapshots: boolean;
-  webServers: Exclude<FullConfigPublic['webServer'], null>[];
-  plugins: TestRunnerPluginRegistration[];
-  listOnly: boolean;
-  cliArgs: string[];
-  cliGrep: string | undefined;
-  cliGrepInvert: string | undefined;
-  cliProjectFilter?: string[];
-  testIdMatcher?: Matcher;
-  passWithNoTests?: boolean;
-  defineConfigWasUsed: boolean;
-};
-
-/**
- * FullConfigInternal allows the plumbing of configuration details throughout the Test Runner without
- * increasing the surface area of the public API type called FullConfig.
- */
-export interface FullConfigInternal extends FullConfigPublic {
-  _internal: ConfigInternal;
-
-  // Overrides the public field.
-  projects: FullProjectInternal[];
-}
-
-type ProjectInternal = {
-  id: string;
-  fullConfig: FullConfigInternal;
-  fullyParallel: boolean;
-  expect: Project['expect'];
-  respectGitIgnore: boolean;
-  deps: FullProjectInternal[];
-};
-
-/**
- * FullProjectInternal allows the plumbing of configuration details throughout the Test Runner without
- * increasing the surface area of the public API type called FullProject.
- */
-export interface FullProjectInternal extends FullProjectPublic {
-  _internal: ProjectInternal;
-  snapshotPathTemplate: string;
-}
-
-export type ContextReuseMode = 'none' | 'force' | 'when-possible';
diff --git a/packages/playwright-test/src/index.ts b/packages/playwright-test/src/index.ts
index a65e7cf3ff..c4de2b927f 100644
--- a/packages/playwright-test/src/index.ts
+++ b/packages/playwright-test/src/index.ts
@@ -22,7 +22,7 @@ import { createGuid, debugMode, addInternalStackPrefix, mergeTraceFiles, saveTra
 import type { Fixtures, PlaywrightTestArgs, PlaywrightTestOptions, PlaywrightWorkerArgs, PlaywrightWorkerOptions, ScreenshotMode, TestInfo, TestType, TraceMode, VideoMode } from '../types/test';
 import type { TestInfoImpl } from './worker/testInfo';
 import { rootTestType } from './common/testType';
-import { type ContextReuseMode } from './common/types';
+import { type ContextReuseMode } from './common/config';
 import { artifactsFolderName } from './isomorphic/folders';
 export { expect } from './matchers/expect';
 export { store as _store } from './store';
diff --git a/packages/playwright-test/src/isomorphic/teleReceiver.ts b/packages/playwright-test/src/isomorphic/teleReceiver.ts
index 8d9dd86bfe..081ac7757a 100644
--- a/packages/playwright-test/src/isomorphic/teleReceiver.ts
+++ b/packages/playwright-test/src/isomorphic/teleReceiver.ts
@@ -15,7 +15,8 @@
  */
 
 import type { FullConfig, FullResult, Location, Reporter, TestError, TestResult, TestStatus, TestStep } from '../../types/testReporter';
-import type { Annotation, FullProject, Metadata } from '../common/types';
+import type { Annotation } from '../common/config';
+import type { FullProject, Metadata } from '../../types/test';
 import type * as reporterTypes from '../../types/testReporter';
 import type { SuitePrivate } from '../../types/reporterPrivate';
 
diff --git a/packages/playwright-test/src/loader/loaderMain.ts b/packages/playwright-test/src/loader/loaderMain.ts
index 21d07b3ecc..01ac96dc4b 100644
--- a/packages/playwright-test/src/loader/loaderMain.ts
+++ b/packages/playwright-test/src/loader/loaderMain.ts
@@ -17,7 +17,7 @@
 import type { SerializedConfig } from '../common/ipc';
 import { ConfigLoader } from '../common/configLoader';
 import { ProcessRunner } from '../common/process';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import { loadTestFile } from '../common/testLoader';
 import type { TestError } from '../../reporter';
 import { addToCompilationCache, serializeCompilationCache } from '../common/compilationCache';
@@ -36,14 +36,14 @@ export class LoaderMain extends ProcessRunner {
 
   private _config(): Promise<FullConfigInternal> {
     if (!this._configPromise)
-      this._configPromise = ConfigLoader.deserialize(this._serializedConfig).then(configLoader => configLoader.fullConfig());
+      this._configPromise = ConfigLoader.deserialize(this._serializedConfig);
     return this._configPromise;
   }
 
   async loadTestFile(params: { file: string }) {
     const testErrors: TestError[] = [];
     const config = await this._config();
-    const fileSuite = await loadTestFile(params.file, config.rootDir, testErrors);
+    const fileSuite = await loadTestFile(params.file, config.config.rootDir, testErrors);
     this._poolBuilder.buildPools(fileSuite);
     return { fileSuite: fileSuite._deepSerialize(), testErrors };
   }
diff --git a/packages/playwright-test/src/matchers/expect.ts b/packages/playwright-test/src/matchers/expect.ts
index 34fc603943..8bf73728cb 100644
--- a/packages/playwright-test/src/matchers/expect.ts
+++ b/packages/playwright-test/src/matchers/expect.ts
@@ -47,7 +47,7 @@ import {
   toPass
 } from './matchers';
 import { toMatchSnapshot, toHaveScreenshot } from './toMatchSnapshot';
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { currentTestInfo, currentExpectTimeout } from '../common/globals';
 import { filteredStackTrace, serializeError, stringifyStackFrames, trimLongString } from '../util';
 import {
diff --git a/packages/playwright-test/src/matchers/matcherHint.ts b/packages/playwright-test/src/matchers/matcherHint.ts
index 5ab053532f..2c1a23c5cd 100644
--- a/packages/playwright-test/src/matchers/matcherHint.ts
+++ b/packages/playwright-test/src/matchers/matcherHint.ts
@@ -15,7 +15,7 @@
  */
 
 import { colors } from 'playwright-core/lib/utilsBundle';
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 
 export function matcherHint(state: ReturnType<Expect['getState']>, matcherName: string, a: any, b: any, matcherOptions: any, timeout?: number) {
   const message = state.utils.matcherHint(matcherName, a, b, matcherOptions);
diff --git a/packages/playwright-test/src/matchers/matchers.ts b/packages/playwright-test/src/matchers/matchers.ts
index 25f6635204..5f4c56724d 100644
--- a/packages/playwright-test/src/matchers/matchers.ts
+++ b/packages/playwright-test/src/matchers/matchers.ts
@@ -17,7 +17,7 @@
 import type { Locator, Page, APIResponse } from 'playwright-core';
 import type { FrameExpectOptions } from 'playwright-core/lib/client/types';
 import { colors } from 'playwright-core/lib/utilsBundle';
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { expectTypes, callLogText } from '../util';
 import { currentTestInfo } from '../common/globals';
 import type { TestInfoErrorState } from '../worker/testInfo';
diff --git a/packages/playwright-test/src/matchers/toBeTruthy.ts b/packages/playwright-test/src/matchers/toBeTruthy.ts
index da89f93a0e..d83d3ba70d 100644
--- a/packages/playwright-test/src/matchers/toBeTruthy.ts
+++ b/packages/playwright-test/src/matchers/toBeTruthy.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { expectTypes, callLogText } from '../util';
 import { matcherHint } from './matcherHint';
 import { currentExpectTimeout } from '../common/globals';
diff --git a/packages/playwright-test/src/matchers/toEqual.ts b/packages/playwright-test/src/matchers/toEqual.ts
index 216c1d6c56..d09ca058fe 100644
--- a/packages/playwright-test/src/matchers/toEqual.ts
+++ b/packages/playwright-test/src/matchers/toEqual.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { expectTypes } from '../util';
 import { callLogText } from '../util';
 import { matcherHint } from './matcherHint';
diff --git a/packages/playwright-test/src/matchers/toMatchSnapshot.ts b/packages/playwright-test/src/matchers/toMatchSnapshot.ts
index 00696d628b..05eff09ca1 100644
--- a/packages/playwright-test/src/matchers/toMatchSnapshot.ts
+++ b/packages/playwright-test/src/matchers/toMatchSnapshot.ts
@@ -17,7 +17,7 @@
 import type { Locator, Page } from 'playwright-core';
 import type { Page as PageEx } from 'playwright-core/lib/client/page';
 import type { Locator as LocatorEx } from 'playwright-core/lib/client/locator';
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { currentTestInfo, currentExpectTimeout } from '../common/globals';
 import type { ImageComparatorOptions, Comparator } from 'playwright-core/lib/utils';
 import { getComparator } from 'playwright-core/lib/utils';
@@ -253,12 +253,12 @@ export function toMatchSnapshot(
   if (received instanceof Promise)
     throw new Error('An unresolved Promise was passed to toMatchSnapshot(), make sure to resolve it by adding await to it.');
 
-  if (testInfo.config._internal.ignoreSnapshots)
+  if (testInfo._configInternal.ignoreSnapshots)
     return { pass: !this.isNot, message: () => '' };
 
   const helper = new SnapshotHelper(
       testInfo, testInfo.snapshotPath.bind(testInfo), determineFileExtension(received),
-      testInfo.project._internal.expect?.toMatchSnapshot || {},
+      testInfo._projectInternal.expect?.toMatchSnapshot || {},
       nameOrOptions, optOptions);
 
   if (this.isNot) {
@@ -298,10 +298,10 @@ export async function toHaveScreenshot(
   if (!testInfo)
     throw new Error(`toHaveScreenshot() must be called during the test`);
 
-  if (testInfo.config._internal.ignoreSnapshots)
+  if (testInfo._configInternal.ignoreSnapshots)
     return { pass: !this.isNot, message: () => '' };
 
-  const config = (testInfo.project._internal.expect as any)?.toHaveScreenshot;
+  const config = (testInfo._projectInternal.expect as any)?.toHaveScreenshot;
   const snapshotPathResolver = testInfo.snapshotPath.bind(testInfo);
   const helper = new SnapshotHelper(
       testInfo, snapshotPathResolver, 'png',
diff --git a/packages/playwright-test/src/matchers/toMatchText.ts b/packages/playwright-test/src/matchers/toMatchText.ts
index c051dbd0b1..5a302027d3 100644
--- a/packages/playwright-test/src/matchers/toMatchText.ts
+++ b/packages/playwright-test/src/matchers/toMatchText.ts
@@ -17,7 +17,7 @@
 
 import type { ExpectedTextValue } from '@protocol/channels';
 import { isRegExp, isString } from 'playwright-core/lib/utils';
-import type { Expect } from '../common/types';
+import type { Expect } from '../../types/test';
 import { expectTypes, callLogText } from '../util';
 import {
   printReceivedStringContainExpectedResult,
diff --git a/packages/playwright-test/src/mount.ts b/packages/playwright-test/src/mount.ts
index 6cec8d9445..609f7bd38f 100644
--- a/packages/playwright-test/src/mount.ts
+++ b/packages/playwright-test/src/mount.ts
@@ -14,8 +14,9 @@
  * limitations under the License.
  */
 
-import type { Fixtures, Locator, Page, BrowserContextOptions, PlaywrightTestArgs, PlaywrightTestOptions, PlaywrightWorkerArgs, PlaywrightWorkerOptions, BrowserContext, ContextReuseMode, FullConfigInternal } from './common/types';
+import type { Fixtures, Locator, Page, BrowserContextOptions, PlaywrightTestArgs, PlaywrightTestOptions, PlaywrightWorkerArgs, PlaywrightWorkerOptions, BrowserContext } from '../types/test';
 import type { Component, JsxComponent, MountOptions } from '../types/experimentalComponent';
+import type { ContextReuseMode, FullConfigInternal } from './common/config';
 
 let boundCallbacksForMount: Function[] = [];
 
@@ -38,7 +39,7 @@ export const fixtures: Fixtures<
     _ctWorker: [{ context: undefined, hash: '' }, { scope: 'worker' }],
 
     page: async ({ page }, use, info) => {
-      if (!(info.config as FullConfigInternal)._internal.defineConfigWasUsed)
+      if (!((info as any)._configInternal as FullConfigInternal).defineConfigWasUsed)
         throw new Error('Component testing requires the use of the defineConfig() in your playwright-ct.config.{ts,js}: https://aka.ms/playwright/ct-define-config');
       await (page as any)._wrapApiCall(async () => {
         await page.exposeFunction('__ct_dispatch', (ordinal: number, args: any[]) => {
diff --git a/packages/playwright-test/src/plugins/index.ts b/packages/playwright-test/src/plugins/index.ts
index 1a5a663264..1e700ef493 100644
--- a/packages/playwright-test/src/plugins/index.ts
+++ b/packages/playwright-test/src/plugins/index.ts
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import type { Suite } from '../../types/testReporter';
-import type { FullConfig } from '../common/types';
+import type { FullConfig, Suite } from '../../types/testReporter';
 import type { Multiplexer } from '../reporters/multiplexer';
 
 export interface TestRunnerPlugin {
diff --git a/packages/playwright-test/src/plugins/vitePlugin.ts b/packages/playwright-test/src/plugins/vitePlugin.ts
index 06be18e288..5c23e0e94d 100644
--- a/packages/playwright-test/src/plugins/vitePlugin.ts
+++ b/packages/playwright-test/src/plugins/vitePlugin.ts
@@ -23,11 +23,10 @@ import { parse, traverse, types as t } from '../common/babelBundle';
 import { stoppable } from '../utilsBundle';
 import type { ComponentInfo } from '../common/tsxTransform';
 import { collectComponentUsages, componentInfo } from '../common/tsxTransform';
-import type { FullConfig } from '../common/types';
 import { assert, calculateSha1 } from 'playwright-core/lib/utils';
 import type { AddressInfo } from 'net';
 import { getPlaywrightVersion } from 'playwright-core/lib/utils';
-import type { PlaywrightTestConfig as BasePlaywrightTestConfig } from '@playwright/test';
+import type { PlaywrightTestConfig as BasePlaywrightTestConfig, FullConfig } from '@playwright/test';
 import type { PluginContext } from 'rollup';
 import { setExternalDependencies } from '../common/compilationCache';
 
diff --git a/packages/playwright-test/src/plugins/webServerPlugin.ts b/packages/playwright-test/src/plugins/webServerPlugin.ts
index ab7fe766a2..987f1a57b4 100644
--- a/packages/playwright-test/src/plugins/webServerPlugin.ts
+++ b/packages/playwright-test/src/plugins/webServerPlugin.ts
@@ -21,7 +21,7 @@ import { raceAgainstTimeout, launchProcess, httpRequest } from 'playwright-core/
 
 import type { FullConfig } from '../../types/testReporter';
 import type { TestRunnerPlugin } from '.';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import { envWithoutExperimentalLoaderOptions } from '../util';
 import type { Multiplexer } from '../reporters/multiplexer';
 
@@ -204,9 +204,9 @@ export const webServer = (options: WebServerPluginOptions): TestRunnerPlugin =>
 };
 
 export const webServerPluginsForConfig = (config: FullConfigInternal): TestRunnerPlugin[] => {
-  const shouldSetBaseUrl = !!config.webServer;
+  const shouldSetBaseUrl = !!config.config.webServer;
   const webServerPlugins = [];
-  for (const webServerConfig of config._internal.webServers) {
+  for (const webServerConfig of config.webServers) {
     if ((!webServerConfig.port && !webServerConfig.url) || (webServerConfig.port && webServerConfig.url))
       throw new Error(`Exactly one of 'port' or 'url' is required in config.webServer.`);
 
diff --git a/packages/playwright-test/src/reporters/base.ts b/packages/playwright-test/src/reporters/base.ts
index 0164ab1394..53b554469e 100644
--- a/packages/playwright-test/src/reporters/base.ts
+++ b/packages/playwright-test/src/reporters/base.ts
@@ -19,9 +19,9 @@ import fs from 'fs';
 import path from 'path';
 import type { FullConfig, TestCase, Suite, TestResult, TestError, FullResult, TestStep, Location, Reporter } from '../../types/testReporter';
 import type { SuitePrivate } from '../../types/reporterPrivate';
-import type { FullConfigInternal } from '../common/types';
 import { codeFrameColumns } from '../common/babelBundle';
 import { monotonicTime } from 'playwright-core/lib/utils';
+import { FullConfigInternal } from '../common/config';
 
 export type TestResultOutput = { chunk: string | Buffer, type: 'stdout' | 'stderr' };
 export const kOutputSymbol = Symbol('output');
@@ -49,7 +49,7 @@ type TestSummary = {
 
 export class BaseReporter implements Reporter {
   duration = 0;
-  config!: FullConfigInternal;
+  config!: FullConfig;
   suite!: Suite;
   totalTestCount = 0;
   result!: FullResult;
@@ -66,7 +66,7 @@ export class BaseReporter implements Reporter {
 
   onBegin(config: FullConfig, suite: Suite) {
     this.monotonicStartTime = monotonicTime();
-    this.config = config as FullConfigInternal;
+    this.config = config;
     this.suite = suite;
     this.totalTestCount = suite.allTests().length;
   }
@@ -122,7 +122,7 @@ export class BaseReporter implements Reporter {
   }
 
   protected generateStartingMessage() {
-    const jobs = Math.min(this.config.workers, this.config._internal.maxConcurrentTestGroups);
+    const jobs = Math.min(this.config.workers, FullConfigInternal.from(this.config).maxConcurrentTestGroups);
     const shardDetails = this.config.shard ? `, shard ${this.config.shard.current} of ${this.config.shard.total}` : '';
     if (!this.totalTestCount)
       return '';
diff --git a/packages/playwright-test/src/reporters/html.ts b/packages/playwright-test/src/reporters/html.ts
index a2ad7136f6..b31a4c1962 100644
--- a/packages/playwright-test/src/reporters/html.ts
+++ b/packages/playwright-test/src/reporters/html.ts
@@ -26,7 +26,7 @@ import type { JsonAttachment, JsonReport, JsonSuite, JsonTestCase, JsonTestResul
 import RawReporter from './raw';
 import { stripAnsiEscapes } from './base';
 import { getPackageJsonPath, sanitizeForFilePath } from '../util';
-import type { Metadata } from '../common/types';
+import type { Metadata } from '../../types/test';
 import type { ZipFile } from 'playwright-core/lib/zipBundle';
 import { yazl } from 'playwright-core/lib/zipBundle';
 import { mime } from 'playwright-core/lib/utilsBundle';
diff --git a/packages/playwright-test/src/reporters/json.ts b/packages/playwright-test/src/reporters/json.ts
index 2921760747..33fd3a58cd 100644
--- a/packages/playwright-test/src/reporters/json.ts
+++ b/packages/playwright-test/src/reporters/json.ts
@@ -20,7 +20,7 @@ import type { FullConfig, TestCase, Suite, TestResult, TestError, TestStep, Full
 import { formatError, prepareErrorStack } from './base';
 import { MultiMap } from 'playwright-core/lib/utils';
 import { assert } from 'playwright-core/lib/utils';
-import type { FullProjectInternal } from '../common/types';
+import { FullProjectInternal } from '../common/config';
 
 export function toPosixPath(aPath: string): string {
   return aPath.split(path.sep).join(path.posix.sep);
@@ -64,7 +64,7 @@ class JSONReporter implements Reporter {
             repeatEach: project.repeatEach,
             retries: project.retries,
             metadata: project.metadata,
-            id: (project as FullProjectInternal)._internal.id,
+            id: FullProjectInternal.from(project).id,
             name: project.name,
             testDir: toPosixPath(project.testDir),
             testIgnore: serializePatterns(project.testIgnore),
@@ -81,7 +81,7 @@ class JSONReporter implements Reporter {
   private _mergeSuites(suites: Suite[]): JSONReportSuite[] {
     const fileSuites = new MultiMap<string, JSONReportSuite>();
     for (const projectSuite of suites) {
-      const projectId = (projectSuite.project() as FullProjectInternal)._internal.id;
+      const projectId = FullProjectInternal.from(projectSuite.project()!).id;
       const projectName = projectSuite.project()!.name;
       for (const fileSuite of projectSuite.suites) {
         const file = fileSuite.location!.file;
diff --git a/packages/playwright-test/src/reporters/multiplexer.ts b/packages/playwright-test/src/reporters/multiplexer.ts
index dab2d80dc8..314f5a778f 100644
--- a/packages/playwright-test/src/reporters/multiplexer.ts
+++ b/packages/playwright-test/src/reporters/multiplexer.ts
@@ -16,6 +16,7 @@
 
 import type { FullConfig, TestCase, TestError, TestResult, FullResult, TestStep, Reporter } from '../../types/testReporter';
 import { Suite } from '../common/test';
+import type { FullConfigInternal } from '../common/config';
 import { addSnippetToError } from './base';
 
 type StdIOChunk = {
@@ -27,7 +28,7 @@ type StdIOChunk = {
 export class Multiplexer {
   private _reporters: Reporter[];
   private _deferred: { error?: TestError, stdout?: StdIOChunk, stderr?: StdIOChunk }[] | null = [];
-  private _config!: FullConfig;
+  private _config!: FullConfigInternal;
 
   constructor(reporters: Reporter[]) {
     this._reporters = reporters;
@@ -37,7 +38,7 @@ export class Multiplexer {
     return this._reporters.some(r => r.printsToStdio ? r.printsToStdio() : true);
   }
 
-  onConfigure(config: FullConfig) {
+  onConfigure(config: FullConfigInternal) {
     this._config = config;
   }
 
@@ -92,7 +93,7 @@ export class Multiplexer {
   async onExit(result: FullResult) {
     if (this._deferred) {
       // onBegin was not reported, emit it.
-      this.onBegin(this._config, new Suite('', 'root'));
+      this.onBegin(this._config.config, new Suite('', 'root'));
     }
 
     for (const reporter of this._reporters)
@@ -107,7 +108,7 @@ export class Multiplexer {
       this._deferred.push({ error });
       return;
     }
-    addSnippetToError(this._config, error);
+    addSnippetToError(this._config.config, error);
     for (const reporter of this._reporters)
       wrap(() => reporter.onError?.(error));
   }
@@ -125,12 +126,12 @@ export class Multiplexer {
 
   private _addSnippetToTestErrors(test: TestCase, result: TestResult) {
     for (const error of result.errors)
-      addSnippetToError(this._config, error, test.location.file);
+      addSnippetToError(this._config.config, error, test.location.file);
   }
 
   private _addSnippetToStepError(test: TestCase, step: TestStep) {
     if (step.error)
-      addSnippetToError(this._config, step.error, test.location.file);
+      addSnippetToError(this._config.config, step.error, test.location.file);
   }
 
 }
diff --git a/packages/playwright-test/src/reporters/raw.ts b/packages/playwright-test/src/reporters/raw.ts
index d366794335..24f8357139 100644
--- a/packages/playwright-test/src/reporters/raw.ts
+++ b/packages/playwright-test/src/reporters/raw.ts
@@ -23,7 +23,7 @@ import { formatResultFailure } from './base';
 import { toPosixPath, serializePatterns } from './json';
 import { MultiMap } from 'playwright-core/lib/utils';
 import { codeFrameColumns } from '../common/babelBundle';
-import type { Metadata } from '../common/types';
+import type { Metadata } from '../../types/test';
 import type { SuitePrivate } from '../../types/reporterPrivate';
 
 export type JsonLocation = Location;
diff --git a/packages/playwright-test/src/reporters/teleEmitter.ts b/packages/playwright-test/src/reporters/teleEmitter.ts
index cc34209d64..19afc54ded 100644
--- a/packages/playwright-test/src/reporters/teleEmitter.ts
+++ b/packages/playwright-test/src/reporters/teleEmitter.ts
@@ -18,7 +18,7 @@ import type { FullConfig, FullResult, Reporter, TestError, TestResult, TestStep,
 import type { Suite, TestCase } from '../common/test';
 import type { JsonConfig, JsonProject, JsonSuite, JsonTestCase, JsonTestEnd, JsonTestResultEnd, JsonTestResultStart, JsonTestStepEnd, JsonTestStepStart } from '../isomorphic/teleReceiver';
 import type { SuitePrivate } from '../../types/reporterPrivate';
-import type { FullConfigInternal, FullProjectInternal } from '../common/types';
+import { FullConfigInternal, FullProjectInternal } from '../common/config';
 import { createGuid } from 'playwright-core/lib/utils';
 import { serializeRegexPatterns } from '../isomorphic/teleReceiver';
 import path from 'path';
@@ -123,14 +123,14 @@ export class TeleReporterEmitter implements Reporter {
     return {
       rootDir: config.rootDir,
       configFile: this._relativePath(config.configFile),
-      listOnly: (config as FullConfigInternal)._internal.listOnly,
+      listOnly: FullConfigInternal.from(config).listOnly,
     };
   }
 
   private _serializeProject(suite: Suite): JsonProject {
     const project = suite.project()!;
     const report: JsonProject = {
-      id: (project as FullProjectInternal)._internal.id,
+      id: FullProjectInternal.from(project).id,
       metadata: project.metadata,
       name: project.name,
       outputDir: this._relativePath(project.outputDir),
diff --git a/packages/playwright-test/src/runner/dispatcher.ts b/packages/playwright-test/src/runner/dispatcher.ts
index 1b6f65de8d..17dbc1aae8 100644
--- a/packages/playwright-test/src/runner/dispatcher.ts
+++ b/packages/playwright-test/src/runner/dispatcher.ts
@@ -23,7 +23,7 @@ import type { TestCase } from '../common/test';
 import { ManualPromise } from 'playwright-core/lib/utils';
 import { WorkerHost } from './workerHost';
 import type { TestGroup } from './testGroups';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import type { Multiplexer } from '../reporters/multiplexer';
 
 type TestResultData = {
@@ -180,7 +180,7 @@ export class Dispatcher {
     this._isStopped = false;
     this._workerSlots = [];
     // 1. Allocate workers.
-    for (let i = 0; i < this._config.workers; i++)
+    for (let i = 0; i < this._config.config.workers; i++)
       this._workerSlots.push({ busy: false });
     // 2. Schedule enough jobs.
     for (let i = 0; i < this._workerSlots.length; i++)
@@ -504,7 +504,7 @@ export class Dispatcher {
   }
 
   private _hasReachedMaxFailures() {
-    const maxFailures = this._config.maxFailures;
+    const maxFailures = this._config.config.maxFailures;
     return maxFailures > 0 && this._failureCount >= maxFailures;
   }
 
@@ -512,7 +512,7 @@ export class Dispatcher {
     if (result.status !== 'skipped' && result.status !== test.expectedStatus)
       ++this._failureCount;
     this._reporter.onTestEnd?.(test, result);
-    const maxFailures = this._config.maxFailures;
+    const maxFailures = this._config.config.maxFailures;
     if (maxFailures && this._failureCount === maxFailures)
       this.stop().catch(e => {});
   }
diff --git a/packages/playwright-test/src/runner/loadUtils.ts b/packages/playwright-test/src/runner/loadUtils.ts
index 35201e1496..c5eee1310d 100644
--- a/packages/playwright-test/src/runner/loadUtils.ts
+++ b/packages/playwright-test/src/runner/loadUtils.ts
@@ -15,11 +15,12 @@
  */
 
 import path from 'path';
-import type { Reporter, TestError } from '../../types/testReporter';
+import type { FullConfig, Reporter, TestError } from '../../types/testReporter';
 import { InProcessLoaderHost, OutOfProcessLoaderHost } from './loaderHost';
 import { Suite } from '../common/test';
 import type { TestCase } from '../common/test';
-import type { FullConfigInternal, FullProjectInternal } from '../common/types';
+import type { FullProjectInternal } from '../common/config';
+import type { FullConfigInternal } from '../common/config';
 import { createFileMatcherFromArguments, createFileFiltersFromArguments, createTitleMatcher, errorWithFile, forceRegExp } from '../util';
 import type { Matcher, TestFileFilter } from '../util';
 import { buildProjectsClosure, collectFilesForProject, filterProjects } from './projectUtils';
@@ -35,11 +36,11 @@ export async function collectProjectsAndTestFiles(testRun: TestRun, additionalFi
   const config = testRun.config;
   const fsCache = new Map();
   const sourceMapCache = new Map();
-  const cliFileMatcher = config._internal.cliArgs.length ? createFileMatcherFromArguments(config._internal.cliArgs) : null;
+  const cliFileMatcher = config.cliArgs.length ? createFileMatcherFromArguments(config.cliArgs) : null;
 
   // First collect all files for the projects in the command line, don't apply any file filters.
   const allFilesForProject = new Map<FullProjectInternal, string[]>();
-  for (const project of filterProjects(config.projects, config._internal.cliProjectFilter)) {
+  for (const project of filterProjects(config.projects, config.cliProjectFilter)) {
     const files = await collectFilesForProject(project, fsCache);
     allFilesForProject.set(project, files);
   }
@@ -100,8 +101,8 @@ export async function loadFileSuites(testRun: TestRun, mode: 'out-of-process' |
   for (const file of allTestFiles) {
     for (const dependency of dependenciesForTestFile(file)) {
       if (allTestFiles.has(dependency)) {
-        const importer = path.relative(config.rootDir, file);
-        const importee = path.relative(config.rootDir, dependency);
+        const importer = path.relative(config.config.rootDir, file);
+        const importee = path.relative(config.config.rootDir, dependency);
         errors.push({
           message: `Error: test file "${importer}" should not import test file "${importee}"`,
           location: { file, line: 1, column: 1 },
@@ -125,20 +126,20 @@ export async function createRootSuite(testRun: TestRun, errors: TestError[], sho
   // First add top-level projects, so that we can filterOnly and shard just top-level.
   {
     // Interpret cli parameters.
-    const cliFileFilters = createFileFiltersFromArguments(config._internal.cliArgs);
-    const grepMatcher = config._internal.cliGrep ? createTitleMatcher(forceRegExp(config._internal.cliGrep)) : () => true;
-    const grepInvertMatcher = config._internal.cliGrepInvert ? createTitleMatcher(forceRegExp(config._internal.cliGrepInvert)) : () => false;
+    const cliFileFilters = createFileFiltersFromArguments(config.cliArgs);
+    const grepMatcher = config.cliGrep ? createTitleMatcher(forceRegExp(config.cliGrep)) : () => true;
+    const grepInvertMatcher = config.cliGrepInvert ? createTitleMatcher(forceRegExp(config.cliGrepInvert)) : () => false;
     const cliTitleMatcher = (title: string) => !grepInvertMatcher(title) && grepMatcher(title);
 
     // Clone file suites for top-level projects.
     for (const [project, fileSuites] of testRun.projectSuites) {
       if (testRun.projectType.get(project) === 'top-level')
-        rootSuite._addSuite(await createProjectSuite(fileSuites, project, { cliFileFilters, cliTitleMatcher, testIdMatcher: config._internal.testIdMatcher }));
+        rootSuite._addSuite(await createProjectSuite(fileSuites, project, { cliFileFilters, cliTitleMatcher, testIdMatcher: config.testIdMatcher }));
     }
   }
 
   // Complain about only.
-  if (config.forbidOnly) {
+  if (config.config.forbidOnly) {
     const onlyTestsAndSuites = rootSuite._getOnlyItems();
     if (onlyTestsAndSuites.length > 0)
       errors.push(...createForbidOnlyErrors(onlyTestsAndSuites));
@@ -149,14 +150,14 @@ export async function createRootSuite(testRun: TestRun, errors: TestError[], sho
     filterOnly(rootSuite);
 
   // Shard only the top-level projects.
-  if (config.shard) {
+  if (config.config.shard) {
     // Create test groups for top-level projects.
     const testGroups: TestGroup[] = [];
     for (const projectSuite of rootSuite.suites)
-      testGroups.push(...createTestGroups(projectSuite, config.workers));
+      testGroups.push(...createTestGroups(projectSuite, config.config.workers));
 
     // Shard test groups.
-    const testGroupsInThisShard = filterForShard(config.shard, testGroups);
+    const testGroupsInThisShard = filterForShard(config.config.shard, testGroups);
     const testsInThisShard = new Set<TestCase>();
     for (const group of testGroupsInThisShard) {
       for (const test of group.tests)
@@ -171,7 +172,7 @@ export async function createRootSuite(testRun: TestRun, errors: TestError[], sho
   {
     // Filtering only and sharding might have reduced the number of top-level projects.
     // Build the project closure to only include dependencies that are still needed.
-    const projectClosure = new Map(buildProjectsClosure(rootSuite.suites.map(suite => suite.project() as FullProjectInternal)));
+    const projectClosure = new Map(buildProjectsClosure(rootSuite.suites.map(suite => suite._projectConfig!)));
 
     // Clone file suites for dependency projects.
     for (const [project, fileSuites] of testRun.projectSuites) {
@@ -184,12 +185,12 @@ export async function createRootSuite(testRun: TestRun, errors: TestError[], sho
 }
 
 async function createProjectSuite(fileSuites: Suite[], project: FullProjectInternal, options: { cliFileFilters: TestFileFilter[], cliTitleMatcher?: Matcher, testIdMatcher?: Matcher }): Promise<Suite> {
-  const projectSuite = new Suite(project.name, 'project');
+  const projectSuite = new Suite(project.project.name, 'project');
   projectSuite._projectConfig = project;
-  if (project._internal.fullyParallel)
+  if (project.fullyParallel)
     projectSuite._parallelMode = 'parallel';
   for (const fileSuite of fileSuites) {
-    for (let repeatEachIndex = 0; repeatEachIndex < project.repeatEach; repeatEachIndex++) {
+    for (let repeatEachIndex = 0; repeatEachIndex < project.project.repeatEach; repeatEachIndex++) {
       const builtSuite = buildFileSuiteForProject(project, fileSuite, repeatEachIndex);
       projectSuite._addSuite(builtSuite);
     }
@@ -198,8 +199,8 @@ async function createProjectSuite(fileSuites: Suite[], project: FullProjectInter
   filterByFocusedLine(projectSuite, options.cliFileFilters);
   filterByTestIds(projectSuite, options.testIdMatcher);
 
-  const grepMatcher = createTitleMatcher(project.grep);
-  const grepInvertMatcher = project.grepInvert ? createTitleMatcher(project.grepInvert) : null;
+  const grepMatcher = createTitleMatcher(project.project.grep);
+  const grepInvertMatcher = project.project.grepInvert ? createTitleMatcher(project.project.grepInvert) : null;
 
   const titleMatcher = (test: TestCase) => {
     const grepTitle = test.titlePath().join(' ');
@@ -234,7 +235,7 @@ function createDuplicateTitlesErrors(config: FullConfigInternal, fileSuite: Suit
     const existingTest = testsByFullTitle.get(fullTitle);
     if (existingTest) {
       const error: TestError = {
-        message: `Error: duplicate test title "${fullTitle}", first declared in ${buildItemLocation(config.rootDir, existingTest)}`,
+        message: `Error: duplicate test title "${fullTitle}", first declared in ${buildItemLocation(config.config.rootDir, existingTest)}`,
         location: test.location,
       };
       errors.push(error);
@@ -259,12 +260,12 @@ async function requireOrImportDefaultFunction(file: string, expectConstructor: b
   return func;
 }
 
-export function loadGlobalHook(config: FullConfigInternal, file: string): Promise<(config: FullConfigInternal) => any> {
-  return requireOrImportDefaultFunction(path.resolve(config.rootDir, file), false);
+export function loadGlobalHook(config: FullConfigInternal, file: string): Promise<(config: FullConfig) => any> {
+  return requireOrImportDefaultFunction(path.resolve(config.config.rootDir, file), false);
 }
 
 export function loadReporter(config: FullConfigInternal, file: string): Promise<new (arg?: any) => Reporter> {
-  return requireOrImportDefaultFunction(path.resolve(config.rootDir, file), true);
+  return requireOrImportDefaultFunction(path.resolve(config.config.rootDir, file), true);
 }
 
 function sourceMapSources(file: string, cache: Map<string, string[]>): string[] {
diff --git a/packages/playwright-test/src/runner/loaderHost.ts b/packages/playwright-test/src/runner/loaderHost.ts
index 86f13cc785..29a697c286 100644
--- a/packages/playwright-test/src/runner/loaderHost.ts
+++ b/packages/playwright-test/src/runner/loaderHost.ts
@@ -19,7 +19,7 @@ import { serializeConfig } from '../common/ipc';
 import { ProcessHost } from './processHost';
 import { Suite } from '../common/test';
 import { loadTestFile } from '../common/testLoader';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import { PoolBuilder } from '../common/poolBuilder';
 import { addToCompilationCache } from '../common/compilationCache';
 
@@ -33,7 +33,7 @@ export class InProcessLoaderHost {
   }
 
   async loadTestFile(file: string, testErrors: TestError[]): Promise<Suite> {
-    const result = await loadTestFile(file, this._config.rootDir, testErrors);
+    const result = await loadTestFile(file, this._config.config.rootDir, testErrors);
     this._poolBuilder.buildPools(result, testErrors);
     return result;
   }
diff --git a/packages/playwright-test/src/runner/projectUtils.ts b/packages/playwright-test/src/runner/projectUtils.ts
index 547906065c..664eadcbc5 100644
--- a/packages/playwright-test/src/runner/projectUtils.ts
+++ b/packages/playwright-test/src/runner/projectUtils.ts
@@ -18,7 +18,7 @@ import fs from 'fs';
 import path from 'path';
 import { minimatch } from 'playwright-core/lib/utilsBundle';
 import { promisify } from 'util';
-import type { FullProjectInternal } from '../common/types';
+import type { FullProjectInternal } from '../common/config';
 import { createFileMatcher } from '../util';
 
 const readFileAsync = promisify(fs.readFile);
@@ -35,12 +35,12 @@ export function filterProjects(projects: FullProjectInternal[], projectNames?: s
     unknownProjects.set(name, n);
   });
   const result = projects.filter(project => {
-    const name = project.name.toLocaleLowerCase();
+    const name = project.project.name.toLocaleLowerCase();
     unknownProjects.delete(name);
     return projectsToFind.has(name);
   });
   if (unknownProjects.size) {
-    const names = projects.map(p => p.name).filter(name => !!name);
+    const names = projects.map(p => p.project.name).filter(name => !!name);
     if (!names.length)
       throw new Error(`No named projects are specified in the configuration file`);
     const unknownProjectNames = Array.from(unknownProjects.values()).map(n => `"${n}"`).join(', ');
@@ -58,7 +58,7 @@ export function buildProjectsClosure(projects: FullProjectInternal[]): Map<FullP
       throw error;
     }
     result.set(project, depth ? 'dependency' : 'top-level');
-    project._internal.deps.map(visit.bind(undefined, depth + 1));
+    project.deps.map(visit.bind(undefined, depth + 1));
   };
   for (const p of projects)
     result.set(p, 'top-level');
@@ -70,9 +70,9 @@ export function buildProjectsClosure(projects: FullProjectInternal[]): Map<FullP
 export async function collectFilesForProject(project: FullProjectInternal, fsCache = new Map<string, string[]>()): Promise<string[]> {
   const extensions = ['.js', '.ts', '.mjs', '.tsx', '.jsx'];
   const testFileExtension = (file: string) => extensions.includes(path.extname(file));
-  const allFiles = await cachedCollectFiles(project.testDir, project._internal.respectGitIgnore, fsCache);
-  const testMatch = createFileMatcher(project.testMatch);
-  const testIgnore = createFileMatcher(project.testIgnore);
+  const allFiles = await cachedCollectFiles(project.project.testDir, project.respectGitIgnore, fsCache);
+  const testMatch = createFileMatcher(project.project.testMatch);
+  const testIgnore = createFileMatcher(project.project.testIgnore);
   const testFiles = allFiles.filter(file => {
     if (!testFileExtension(file))
       return false;
diff --git a/packages/playwright-test/src/runner/reporters.ts b/packages/playwright-test/src/runner/reporters.ts
index 3cf8013b3f..108d1ef7b0 100644
--- a/packages/playwright-test/src/runner/reporters.ts
+++ b/packages/playwright-test/src/runner/reporters.ts
@@ -15,7 +15,7 @@
  */
 
 import path from 'path';
-import type { Reporter, TestError } from '../../types/testReporter';
+import type { FullConfig, Reporter, TestError } from '../../types/testReporter';
 import { formatError } from '../reporters/base';
 import DotReporter from '../reporters/dot';
 import EmptyReporter from '../reporters/empty';
@@ -27,9 +27,8 @@ import LineReporter from '../reporters/line';
 import ListReporter from '../reporters/list';
 import { Multiplexer } from '../reporters/multiplexer';
 import type { Suite } from '../common/test';
-import type { FullConfigInternal } from '../common/types';
+import type { BuiltInReporter, FullConfigInternal } from '../common/config';
 import { loadReporter } from './loadUtils';
-import type { BuiltInReporter } from '../common/configLoader';
 
 export async function createReporter(config: FullConfigInternal, mode: 'list' | 'watch' | 'run' | 'ui', additionalReporters: Reporter[] = []): Promise<Multiplexer> {
   const defaultReporters: {[key in BuiltInReporter]: new(arg: any) => Reporter} = {
@@ -46,9 +45,9 @@ export async function createReporter(config: FullConfigInternal, mode: 'list' |
   if (mode === 'watch') {
     reporters.push(new ListReporter());
   } else {
-    for (const r of config.reporter) {
+    for (const r of config.config.reporter) {
       const [name, arg] = r;
-      const options = { ...arg, configDir: config._internal.configDir };
+      const options = { ...arg, configDir: config.configDir };
       if (name in defaultReporters) {
         reporters.push(new defaultReporters[name as keyof typeof defaultReporters](options));
       } else {
@@ -79,9 +78,9 @@ export async function createReporter(config: FullConfigInternal, mode: 'list' |
 }
 
 export class ListModeReporter implements Reporter {
-  private config!: FullConfigInternal;
+  private config!: FullConfig;
 
-  onBegin(config: FullConfigInternal, suite: Suite): void {
+  onBegin(config: FullConfig, suite: Suite): void {
     this.config = config;
     // eslint-disable-next-line no-console
     console.log(`Listing tests:`);
diff --git a/packages/playwright-test/src/runner/runner.ts b/packages/playwright-test/src/runner/runner.ts
index d5c0d5b5e8..c9225de18b 100644
--- a/packages/playwright-test/src/runner/runner.ts
+++ b/packages/playwright-test/src/runner/runner.ts
@@ -21,7 +21,7 @@ import { webServerPluginsForConfig } from '../plugins/webServerPlugin';
 import { collectFilesForProject, filterProjects } from './projectUtils';
 import { createReporter } from './reporters';
 import { TestRun, createTaskRunner, createTaskRunnerForList } from './tasks';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import { colors } from 'playwright-core/lib/utilsBundle';
 import { runWatchModeLoop } from './watchMode';
 import { runUIMode } from './uiMode';
@@ -49,11 +49,11 @@ export class Runner {
 
   async runAllTests(): Promise<FullResult['status']> {
     const config = this._config;
-    const listOnly = config._internal.listOnly;
-    const deadline = config.globalTimeout ? monotonicTime() + config.globalTimeout : 0;
+    const listOnly = config.listOnly;
+    const deadline = config.config.globalTimeout ? monotonicTime() + config.config.globalTimeout : 0;
 
     // Legacy webServer support.
-    webServerPluginsForConfig(config).forEach(p => config._internal.plugins.push({ factory: p }));
+    webServerPluginsForConfig(config).forEach(p => config.plugins.push({ factory: p }));
 
     const reporter = await createReporter(config, listOnly ? 'list' : 'run');
     const taskRunner = listOnly ? createTaskRunnerForList(config, reporter, 'in-process')
@@ -62,7 +62,7 @@ export class Runner {
     const testRun = new TestRun(config, reporter);
     reporter.onConfigure(config);
 
-    if (!listOnly && config._internal.ignoreSnapshots) {
+    if (!listOnly && config.ignoreSnapshots) {
       reporter.onStdOut(colors.dim([
         'NOTE: running with "ignoreSnapshots" option. All of the following asserts are silently ignored:',
         '- expect().toMatchSnapshot()',
@@ -89,13 +89,13 @@ export class Runner {
 
   async watchAllTests(): Promise<FullResult['status']> {
     const config = this._config;
-    webServerPluginsForConfig(config).forEach(p => config._internal.plugins.push({ factory: p }));
+    webServerPluginsForConfig(config).forEach(p => config.plugins.push({ factory: p }));
     return await runWatchModeLoop(config);
   }
 
   async uiAllTests(): Promise<FullResult['status']> {
     const config = this._config;
-    webServerPluginsForConfig(config).forEach(p => config._internal.plugins.push({ factory: p }));
+    webServerPluginsForConfig(config).forEach(p => config.plugins.push({ factory: p }));
     return await runUIMode(config);
   }
 }
diff --git a/packages/playwright-test/src/runner/tasks.ts b/packages/playwright-test/src/runner/tasks.ts
index e9b831b29d..40bbcafd6c 100644
--- a/packages/playwright-test/src/runner/tasks.ts
+++ b/packages/playwright-test/src/runner/tasks.ts
@@ -24,7 +24,7 @@ import type { Multiplexer } from '../reporters/multiplexer';
 import { createTestGroups, type TestGroup } from '../runner/testGroups';
 import type { Task } from './taskRunner';
 import { TaskRunner } from './taskRunner';
-import type { FullConfigInternal, FullProjectInternal } from '../common/types';
+import type { FullConfigInternal, FullProjectInternal } from '../common/config';
 import { collectProjectsAndTestFiles, createRootSuite, loadFileSuites, loadGlobalHook } from './loadUtils';
 import type { Matcher } from '../util';
 import type { Suite } from '../common/test';
@@ -60,7 +60,7 @@ export class TestRun {
 }
 
 export function createTaskRunner(config: FullConfigInternal, reporter: Multiplexer): TaskRunner<TestRun> {
-  const taskRunner = new TaskRunner<TestRun>(reporter, config.globalTimeout);
+  const taskRunner = new TaskRunner<TestRun>(reporter, config.config.globalTimeout);
   addGlobalSetupTasks(taskRunner, config);
   taskRunner.addTask('load tests', createLoadTask('in-process', true));
   addRunTasks(taskRunner, config);
@@ -81,9 +81,9 @@ export function createTaskRunnerForWatch(config: FullConfigInternal, reporter: M
 }
 
 function addGlobalSetupTasks(taskRunner: TaskRunner<TestRun>, config: FullConfigInternal) {
-  for (const plugin of config._internal.plugins)
+  for (const plugin of config.plugins)
     taskRunner.addTask('plugin setup', createPluginSetupTask(plugin));
-  if (config.globalSetup || config.globalTeardown)
+  if (config.config.globalSetup || config.config.globalTeardown)
     taskRunner.addTask('global setup', createGlobalSetupTask());
   taskRunner.addTask('clear output', createRemoveOutputDirsTask());
 }
@@ -91,10 +91,10 @@ function addGlobalSetupTasks(taskRunner: TaskRunner<TestRun>, config: FullConfig
 function addRunTasks(taskRunner: TaskRunner<TestRun>, config: FullConfigInternal) {
   taskRunner.addTask('create phases', createPhasesTask());
   taskRunner.addTask('report begin', async ({ reporter, rootSuite }) => {
-    reporter.onBegin?.(config, rootSuite!);
+    reporter.onBegin?.(config.config, rootSuite!);
     return () => reporter.onEnd();
   });
-  for (const plugin of config._internal.plugins)
+  for (const plugin of config.plugins)
     taskRunner.addTask('plugin begin', createPluginBeginTask(plugin));
   taskRunner.addTask('start workers', createWorkersTask());
   taskRunner.addTask('test suite', createRunTestsTask());
@@ -102,10 +102,10 @@ function addRunTasks(taskRunner: TaskRunner<TestRun>, config: FullConfigInternal
 }
 
 export function createTaskRunnerForList(config: FullConfigInternal, reporter: Multiplexer, mode: 'in-process' | 'out-of-process'): TaskRunner<TestRun> {
-  const taskRunner = new TaskRunner<TestRun>(reporter, config.globalTimeout);
+  const taskRunner = new TaskRunner<TestRun>(reporter, config.config.globalTimeout);
   taskRunner.addTask('load tests', createLoadTask(mode, false));
   taskRunner.addTask('report begin', async ({ reporter, rootSuite }) => {
-    reporter.onBegin?.(config, rootSuite!);
+    reporter.onBegin?.(config.config, rootSuite!);
     return () => reporter.onEnd();
   });
   return taskRunner;
@@ -117,7 +117,7 @@ function createPluginSetupTask(plugin: TestRunnerPluginRegistration): Task<TestR
       plugin.instance = await plugin.factory();
     else
       plugin.instance = plugin.factory;
-    await plugin.instance?.setup?.(config, config._internal.configDir, reporter);
+    await plugin.instance?.setup?.(config.config, config.configDir, reporter);
     return () => plugin.instance?.teardown?.();
   };
 }
@@ -131,13 +131,13 @@ function createPluginBeginTask(plugin: TestRunnerPluginRegistration): Task<TestR
 
 function createGlobalSetupTask(): Task<TestRun> {
   return async ({ config }) => {
-    const setupHook = config.globalSetup ? await loadGlobalHook(config, config.globalSetup) : undefined;
-    const teardownHook = config.globalTeardown ? await loadGlobalHook(config, config.globalTeardown) : undefined;
-    const globalSetupResult = setupHook ? await setupHook(config) : undefined;
+    const setupHook = config.config.globalSetup ? await loadGlobalHook(config, config.config.globalSetup) : undefined;
+    const teardownHook = config.config.globalTeardown ? await loadGlobalHook(config, config.config.globalTeardown) : undefined;
+    const globalSetupResult = setupHook ? await setupHook(config.config) : undefined;
     return async () => {
       if (typeof globalSetupResult === 'function')
         await globalSetupResult();
-      await teardownHook?.(config);
+      await teardownHook?.(config.config);
     };
   };
 }
@@ -146,8 +146,8 @@ function createRemoveOutputDirsTask(): Task<TestRun> {
   return async ({ config }) => {
     const outputDirs = new Set<string>();
     for (const p of config.projects) {
-      if (!config._internal.cliProjectFilter || config._internal.cliProjectFilter.includes(p.name))
-        outputDirs.add(p.outputDir);
+      if (!config.cliProjectFilter || config.cliProjectFilter.includes(p.project.name))
+        outputDirs.add(p.project.outputDir);
     }
 
     await Promise.all(Array.from(outputDirs).map(outputDir => removeFolderAsync(outputDir).catch(async (error: any) => {
@@ -170,24 +170,24 @@ function createLoadTask(mode: 'out-of-process' | 'in-process', shouldFilterOnly:
     await loadFileSuites(testRun, mode, errors);
     testRun.rootSuite = await createRootSuite(testRun, errors, shouldFilterOnly);
     // Fail when no tests.
-    if (!testRun.rootSuite.allTests().length && !testRun.config._internal.passWithNoTests && !testRun.config.shard)
+    if (!testRun.rootSuite.allTests().length && !testRun.config.passWithNoTests && !testRun.config.config.shard)
       throw new Error(`No tests found`);
   };
 }
 
 function createPhasesTask(): Task<TestRun> {
   return async testRun => {
-    testRun.config._internal.maxConcurrentTestGroups = 0;
+    testRun.config.maxConcurrentTestGroups = 0;
 
     const processed = new Set<FullProjectInternal>();
-    const projectToSuite = new Map(testRun.rootSuite!.suites.map(suite => [suite.project() as FullProjectInternal, suite]));
+    const projectToSuite = new Map(testRun.rootSuite!.suites.map(suite => [suite._projectConfig!, suite]));
     for (let i = 0; i < projectToSuite.size; i++) {
       // Find all projects that have all their dependencies processed by previous phases.
       const phaseProjects: FullProjectInternal[] = [];
       for (const project of projectToSuite.keys()) {
         if (processed.has(project))
           continue;
-        if (project._internal.deps.find(p => !processed.has(p)))
+        if (project.deps.find(p => !processed.has(p)))
           continue;
         phaseProjects.push(project);
       }
@@ -201,12 +201,12 @@ function createPhasesTask(): Task<TestRun> {
         testRun.phases.push(phase);
         for (const project of phaseProjects) {
           const projectSuite = projectToSuite.get(project)!;
-          const testGroups = createTestGroups(projectSuite, testRun.config.workers);
+          const testGroups = createTestGroups(projectSuite, testRun.config.config.workers);
           phase.projects.push({ project, projectSuite, testGroups });
           testGroupsInPhase += testGroups.length;
         }
-        debug('pw:test:task')(`created phase #${testRun.phases.length} with ${phase.projects.map(p => p.project.name).sort()} projects, ${testGroupsInPhase} testGroups`);
-        testRun.config._internal.maxConcurrentTestGroups = Math.max(testRun.config._internal.maxConcurrentTestGroups, testGroupsInPhase);
+        debug('pw:test:task')(`created phase #${testRun.phases.length} with ${phase.projects.map(p => p.project.project.name).sort()} projects, ${testGroupsInPhase} testGroups`);
+        testRun.config.maxConcurrentTestGroups = Math.max(testRun.config.maxConcurrentTestGroups, testGroupsInPhase);
       }
     }
   };
@@ -235,11 +235,11 @@ function createRunTestsTask(): Task<TestRun> {
       for (const { project, testGroups } of projects) {
         // Inherit extra enviroment variables from dependencies.
         let extraEnv: Record<string, string | undefined> = {};
-        for (const dep of project._internal.deps)
-          extraEnv = { ...extraEnv, ...extraEnvByProjectId.get(dep._internal.id) };
-        extraEnvByProjectId.set(project._internal.id, extraEnv);
+        for (const dep of project.deps)
+          extraEnv = { ...extraEnv, ...extraEnvByProjectId.get(dep.id) };
+        extraEnvByProjectId.set(project.id, extraEnv);
 
-        const hasFailedDeps = project._internal.deps.some(p => !successfulProjects.has(p));
+        const hasFailedDeps = project.deps.some(p => !successfulProjects.has(p));
         if (!hasFailedDeps) {
           phaseTestGroups.push(...testGroups);
         } else {
@@ -263,7 +263,7 @@ function createRunTestsTask(): Task<TestRun> {
       // projects failed.
       if (!dispatcher.hasWorkerErrors()) {
         for (const { project, projectSuite } of projects) {
-          const hasFailedDeps = project._internal.deps.some(p => !successfulProjects.has(p));
+          const hasFailedDeps = project.deps.some(p => !successfulProjects.has(p));
           if (!hasFailedDeps && !projectSuite.allTests().some(test => !test.ok()))
             successfulProjects.add(project);
         }
diff --git a/packages/playwright-test/src/runner/uiMode.ts b/packages/playwright-test/src/runner/uiMode.ts
index fd40afeb23..9c182df3fb 100644
--- a/packages/playwright-test/src/runner/uiMode.ts
+++ b/packages/playwright-test/src/runner/uiMode.ts
@@ -19,7 +19,7 @@ import type { Page } from 'playwright-core/lib/server/page';
 import { isUnderTest, ManualPromise } from 'playwright-core/lib/utils';
 import type { FullResult } from '../../reporter';
 import { clearCompilationCache, collectAffectedTestFiles, dependenciesForTestFile } from '../common/compilationCache';
-import type { FullConfigInternal } from '../common/types';
+import type { FullConfigInternal } from '../common/config';
 import { Multiplexer } from '../reporters/multiplexer';
 import { TeleReporterEmitter } from '../reporters/teleEmitter';
 import { createReporter } from './reporters';
@@ -42,20 +42,20 @@ class UIMode {
   constructor(config: FullConfigInternal) {
     this._config = config;
     process.env.PW_LIVE_TRACE_STACKS = '1';
-    config._internal.configCLIOverrides.forbidOnly = false;
-    config._internal.configCLIOverrides.globalTimeout = 0;
-    config._internal.configCLIOverrides.repeatEach = 0;
-    config._internal.configCLIOverrides.shard = undefined;
-    config._internal.configCLIOverrides.updateSnapshots = undefined;
-    config._internal.listOnly = false;
-    config._internal.passWithNoTests = true;
+    config.configCLIOverrides.forbidOnly = false;
+    config.configCLIOverrides.globalTimeout = 0;
+    config.configCLIOverrides.repeatEach = 0;
+    config.configCLIOverrides.shard = undefined;
+    config.configCLIOverrides.updateSnapshots = undefined;
+    config.listOnly = false;
+    config.passWithNoTests = true;
     for (const project of config.projects)
-      project._internal.deps = [];
+      project.deps = [];
 
     for (const p of config.projects)
-      p.retries = 0;
-    config._internal.configCLIOverrides.use = config._internal.configCLIOverrides.use || {};
-    config._internal.configCLIOverrides.use.trace = { mode: 'on', sources: false };
+      p.project.retries = 0;
+    config.configCLIOverrides.use = config.configCLIOverrides.use || {};
+    config.configCLIOverrides.use.trace = { mode: 'on', sources: false };
 
     this._originalStdoutWrite = process.stdout.write;
     this._originalStderrWrite = process.stderr.write;
@@ -148,8 +148,8 @@ class UIMode {
   private async _listTests() {
     const listReporter = new TeleReporterEmitter(e => this._dispatchEvent(e));
     const reporter = new Multiplexer([listReporter]);
-    this._config._internal.listOnly = true;
-    this._config._internal.testIdMatcher = undefined;
+    this._config.listOnly = true;
+    this._config.testIdMatcher = undefined;
     const taskRunner = createTaskRunnerForList(this._config, reporter, 'out-of-process');
     const testRun = new TestRun(this._config, reporter);
     clearCompilationCache();
@@ -159,7 +159,7 @@ class UIMode {
 
     const projectDirs = new Set<string>();
     for (const p of this._config.projects)
-      projectDirs.add(p.testDir);
+      projectDirs.add(p.project.testDir);
     this._globalWatcher.update([...projectDirs], false);
   }
 
@@ -167,8 +167,8 @@ class UIMode {
     await this._stopTests();
 
     const testIdSet = testIds ? new Set<string>(testIds) : null;
-    this._config._internal.listOnly = false;
-    this._config._internal.testIdMatcher = id => !testIdSet || testIdSet.has(id);
+    this._config.listOnly = false;
+    this._config.testIdMatcher = id => !testIdSet || testIdSet.has(id);
 
     const runReporter = new TeleReporterEmitter(e => this._dispatchEvent(e));
     const reporter = await createReporter(this._config, 'ui', [runReporter]);
@@ -180,7 +180,7 @@ class UIMode {
     const run = taskRunner.run(testRun, 0, stop).then(async status => {
       await reporter.onExit({ status });
       this._testRun = undefined;
-      this._config._internal.testIdMatcher = undefined;
+      this._config.testIdMatcher = undefined;
       return status;
     });
     this._testRun = { run, stop };
diff --git a/packages/playwright-test/src/runner/watchMode.ts b/packages/playwright-test/src/runner/watchMode.ts
index 23ceea813a..ae931b55ce 100644
--- a/packages/playwright-test/src/runner/watchMode.ts
+++ b/packages/playwright-test/src/runner/watchMode.ts
@@ -16,7 +16,7 @@
 
 import readline from 'readline';
 import { createGuid, ManualPromise } from 'playwright-core/lib/utils';
-import type { FullConfigInternal, FullProjectInternal } from '../common/types';
+import type { FullConfigInternal, FullProjectInternal } from '../common/config';
 import { Multiplexer } from '../reporters/multiplexer';
 import { createFileMatcher, createFileMatcherFromArguments } from '../util';
 import type { Matcher } from '../util';
@@ -40,15 +40,15 @@ class FSWatcher {
   private _timer: NodeJS.Timeout | undefined;
 
   async update(config: FullConfigInternal) {
-    const commandLineFileMatcher = config._internal.cliArgs.length ? createFileMatcherFromArguments(config._internal.cliArgs) : () => true;
-    const projects = filterProjects(config.projects, config._internal.cliProjectFilter);
+    const commandLineFileMatcher = config.cliArgs.length ? createFileMatcherFromArguments(config.cliArgs) : () => true;
+    const projects = filterProjects(config.projects, config.cliProjectFilter);
     const projectClosure = buildProjectsClosure(projects);
     const projectFilters = new Map<FullProjectInternal, Matcher>();
     for (const [project, type] of projectClosure) {
-      const testMatch = createFileMatcher(project.testMatch);
-      const testIgnore = createFileMatcher(project.testIgnore);
+      const testMatch = createFileMatcher(project.project.testMatch);
+      const testIgnore = createFileMatcher(project.project.testIgnore);
       projectFilters.set(project, file => {
-        if (!file.startsWith(project.testDir) || !testMatch(file) || testIgnore(file))
+        if (!file.startsWith(project.project.testDir) || !testMatch(file) || testIgnore(file))
           return false;
         return type === 'dependency' || commandLineFileMatcher(file);
       });
@@ -59,7 +59,7 @@ class FSWatcher {
     if (this._watcher)
       await this._watcher.close();
 
-    this._watcher = chokidar.watch([...projectClosure.keys()].map(p => p.testDir), { ignoreInitial: true }).on('all', async (event, file) => {
+    this._watcher = chokidar.watch([...projectClosure.keys()].map(p => p.project.testDir), { ignoreInitial: true }).on('all', async (event, file) => {
       if (event !== 'add' && event !== 'change')
         return;
 
@@ -108,9 +108,9 @@ class FSWatcher {
 
 export async function runWatchModeLoop(config: FullConfigInternal): Promise<FullResult['status']> {
   // Reset the settings that don't apply to watch.
-  config._internal.passWithNoTests = true;
+  config.passWithNoTests = true;
   for (const p of config.projects)
-    p.retries = 0;
+    p.project.retries = 0;
 
   // Perform global setup.
   const reporter = await createReporter(config, 'watch');
@@ -123,7 +123,7 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
 
   // Prepare projects that will be watched, set up watcher.
   const failedTestIdCollector = new Set<string>();
-  const originalWorkers = config.workers;
+  const originalWorkers = config.config.workers;
   const fsWatcher = new FSWatcher();
   await fsWatcher.update(config);
 
@@ -165,11 +165,11 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
         type: 'multiselect',
         name: 'projectNames',
         message: 'Select projects',
-        choices: config.projects.map(p => ({ name: p.name })),
+        choices: config.projects.map(p => ({ name: p.project.name })),
       }).catch(() => ({ projectNames: null }));
       if (!projectNames)
         continue;
-      config._internal.cliProjectFilter = projectNames.length ? projectNames : undefined;
+      config.cliProjectFilter = projectNames.length ? projectNames : undefined;
       await fsWatcher.update(config);
       await runTests(config, failedTestIdCollector);
       lastRun = { type: 'regular' };
@@ -185,9 +185,9 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
       if (filePattern === null)
         continue;
       if (filePattern.trim())
-        config._internal.cliArgs = filePattern.split(' ');
+        config.cliArgs = filePattern.split(' ');
       else
-        config._internal.cliArgs = [];
+        config.cliArgs = [];
       await fsWatcher.update(config);
       await runTests(config, failedTestIdCollector);
       lastRun = { type: 'regular' };
@@ -203,9 +203,9 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
       if (testPattern === null)
         continue;
       if (testPattern.trim())
-        config._internal.cliGrep = testPattern;
+        config.cliGrep = testPattern;
       else
-        config._internal.cliGrep = undefined;
+        config.cliGrep = undefined;
       await fsWatcher.update(config);
       await runTests(config, failedTestIdCollector);
       lastRun = { type: 'regular' };
@@ -213,10 +213,10 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
     }
 
     if (command === 'failed') {
-      config._internal.testIdMatcher = id => failedTestIdCollector.has(id);
+      config.testIdMatcher = id => failedTestIdCollector.has(id);
       const failedTestIds = new Set(failedTestIdCollector);
       await runTests(config, failedTestIdCollector, { title: 'running failed tests' });
-      config._internal.testIdMatcher = undefined;
+      config.testIdMatcher = undefined;
       lastRun = { type: 'failed', failedTestIds };
       continue;
     }
@@ -228,9 +228,9 @@ export async function runWatchModeLoop(config: FullConfigInternal): Promise<Full
       } else if (lastRun.type === 'changed') {
         await runChangedTests(config, failedTestIdCollector, lastRun.dirtyTestFiles!, 're-running tests');
       } else if (lastRun.type === 'failed') {
-        config._internal.testIdMatcher = id => lastRun.failedTestIds!.has(id);
+        config.testIdMatcher = id => lastRun.failedTestIds!.has(id);
         await runTests(config, failedTestIdCollector, { title: 're-running tests' });
-        config._internal.testIdMatcher = undefined;
+        config.testIdMatcher = undefined;
       }
       continue;
     }
@@ -259,7 +259,7 @@ async function runChangedTests(config: FullConfigInternal, failedTestIdCollector
 
   // Collect all the affected projects, follow project dependencies.
   // Prepare to exclude all the projects that do not depend on this file, as if they did not exist.
-  const projects = filterProjects(config.projects, config._internal.cliProjectFilter);
+  const projects = filterProjects(config.projects, config.cliProjectFilter);
   const projectClosure = buildProjectsClosure(projects);
   const affectedProjects = affectedProjectsClosure([...projectClosure.keys()], [...filesByProject.keys()]);
   const affectsAnyDependency = [...affectedProjects].some(p => projectClosure.get(p) === 'dependency');
@@ -305,7 +305,7 @@ function affectedProjectsClosure(projectClosure: FullProjectInternal[], affected
   const result = new Set<FullProjectInternal>(affected);
   for (let i = 0; i < projectClosure.length; ++i) {
     for (const p of projectClosure) {
-      for (const dep of p._internal.deps) {
+      for (const dep of p.deps) {
         if (result.has(dep))
           result.add(p);
       }
@@ -379,11 +379,11 @@ let seq = 0;
 function printConfiguration(config: FullConfigInternal, title?: string) {
   const tokens: string[] = [];
   tokens.push('npx playwright test');
-  tokens.push(...(config._internal.cliProjectFilter || [])?.map(p => colors.blue(`--project ${p}`)));
-  if (config._internal.cliGrep)
-    tokens.push(colors.red(`--grep ${config._internal.cliGrep}`));
-  if (config._internal.cliArgs)
-    tokens.push(...config._internal.cliArgs.map(a => colors.bold(a)));
+  tokens.push(...(config.cliProjectFilter || [])?.map(p => colors.blue(`--project ${p}`)));
+  if (config.cliGrep)
+    tokens.push(colors.red(`--grep ${config.cliGrep}`));
+  if (config.cliArgs)
+    tokens.push(...config.cliArgs.map(a => colors.bold(a)));
   if (title)
     tokens.push(colors.dim(`(${title})`));
   if (seq)
@@ -407,14 +407,14 @@ ${colors.dim('Waiting for file changes. Press')} ${colors.bold('enter')} ${color
 
 async function toggleShowBrowser(config: FullConfigInternal, originalWorkers: number) {
   if (!showBrowserServer) {
-    config.workers = 1;
+    config.config.workers = 1;
     showBrowserServer = new PlaywrightServer({ path: '/' + createGuid(), maxConnections: 1 });
     const wsEndpoint = await showBrowserServer.listen();
     process.env.PW_TEST_REUSE_CONTEXT = '1';
     process.env.PW_TEST_CONNECT_WS_ENDPOINT = wsEndpoint;
     process.stdout.write(`${colors.dim('Show & reuse browser:')} ${colors.bold('on')}\n`);
   } else {
-    config.workers = originalWorkers;
+    config.config.workers = originalWorkers;
     await showBrowserServer?.close();
     showBrowserServer = undefined;
     delete process.env.PW_TEST_REUSE_CONTEXT;
diff --git a/packages/playwright-test/src/store.ts b/packages/playwright-test/src/store.ts
index d7bcddeae1..ceb5bd85c7 100644
--- a/packages/playwright-test/src/store.ts
+++ b/packages/playwright-test/src/store.ts
@@ -49,7 +49,7 @@ class JsonStore {
     const config = currentConfig();
     if (!config)
       throw new Error('Cannot access store before config is loaded');
-    return config._internal.storeDir;
+    return config.storeDir;
   }
 
   async set<T>(name: string, value: T | undefined) {
diff --git a/packages/playwright-test/src/util.ts b/packages/playwright-test/src/util.ts
index 50bc893ba1..656d7f7393 100644
--- a/packages/playwright-test/src/util.ts
+++ b/packages/playwright-test/src/util.ts
@@ -21,7 +21,8 @@ import util from 'util';
 import path from 'path';
 import url from 'url';
 import { colors, debug, minimatch, parseStackTraceLine } from 'playwright-core/lib/utilsBundle';
-import type { TestInfoError, Location } from './common/types';
+import type { TestInfoError } from './../types/test';
+import type { Location } from './../types/testReporter';
 import { calculateSha1, isRegExp, isString } from 'playwright-core/lib/utils';
 import type { RawStack } from 'playwright-core/lib/utils';
 
diff --git a/packages/playwright-test/src/worker/fixtureRunner.ts b/packages/playwright-test/src/worker/fixtureRunner.ts
index f42581b23f..93468b7bdd 100644
--- a/packages/playwright-test/src/worker/fixtureRunner.ts
+++ b/packages/playwright-test/src/worker/fixtureRunner.ts
@@ -15,11 +15,12 @@
  */
 
 import { formatLocation, debugTest } from '../util';
-import type { Location, WorkerInfo } from '../common/types';
 import { ManualPromise } from 'playwright-core/lib/utils';
 import type { TestInfoImpl } from './testInfo';
 import type { FixtureDescription, TimeoutManager } from './timeoutManager';
 import { fixtureParameterNames, type FixturePool, type FixtureRegistration, type FixtureScope } from '../common/fixtures';
+import type { WorkerInfo } from '../../types/test';
+import type { Location } from '../../types/testReporter';
 
 class Fixture {
   runner: FixtureRunner;
diff --git a/packages/playwright-test/src/worker/testInfo.ts b/packages/playwright-test/src/worker/testInfo.ts
index 5052bd2ec8..7b8327e971 100644
--- a/packages/playwright-test/src/worker/testInfo.ts
+++ b/packages/playwright-test/src/worker/testInfo.ts
@@ -17,11 +17,12 @@
 import fs from 'fs';
 import path from 'path';
 import { captureRawStack, monotonicTime, zones } from 'playwright-core/lib/utils';
-import type { TestInfoError, TestInfo, TestStatus } from '../../types/test';
+import type { TestInfoError, TestInfo, TestStatus, FullProject, FullConfig } from '../../types/test';
 import type { StepBeginPayload, StepEndPayload, WorkerInitParams } from '../common/ipc';
 import type { TestCase } from '../common/test';
 import { TimeoutManager } from './timeoutManager';
-import type { Annotation, FullConfigInternal, FullProjectInternal, Location } from '../common/types';
+import type { Annotation, FullConfigInternal, FullProjectInternal } from '../common/config';
+import type { Location } from '../../types/testReporter';
 import { getContainedPath, normalizeAndSaveAttachment, sanitizeForFilePath, serializeError, trimLongString } from '../util';
 import type * as trace from '@trace/trace';
 
@@ -54,6 +55,8 @@ export class TestInfoImpl implements TestInfo {
   _didTimeout = false;
   _wasInterrupted = false;
   _lastStepId = 0;
+  readonly _projectInternal: FullProjectInternal;
+  readonly _configInternal: FullConfigInternal;
 
   // ------------ TestInfo fields ------------
   readonly testId: string;
@@ -61,8 +64,8 @@ export class TestInfoImpl implements TestInfo {
   readonly retry: number;
   readonly workerIndex: number;
   readonly parallelIndex: number;
-  readonly project: FullProjectInternal;
-  config: FullConfigInternal;
+  readonly project: FullProject;
+  readonly config: FullConfig;
   readonly title: string;
   readonly titlePath: string[];
   readonly file: string;
@@ -101,8 +104,8 @@ export class TestInfoImpl implements TestInfo {
   }
 
   constructor(
-    config: FullConfigInternal,
-    project: FullProjectInternal,
+    configInternal: FullConfigInternal,
+    projectInternal: FullProjectInternal,
     workerParams: WorkerInitParams,
     test: TestCase,
     retry: number,
@@ -120,8 +123,10 @@ export class TestInfoImpl implements TestInfo {
     this.retry = retry;
     this.workerIndex = workerParams.workerIndex;
     this.parallelIndex =  workerParams.parallelIndex;
-    this.project = project;
-    this.config = config;
+    this._projectInternal = projectInternal;
+    this.project = projectInternal.project;
+    this._configInternal = configInternal;
+    this.config = configInternal.config;
     this.title = test.title;
     this.titlePath = test.titlePath();
     this.file = test.location.file;
@@ -138,8 +143,8 @@ export class TestInfoImpl implements TestInfo {
       const fullTitleWithoutSpec = test.titlePath().slice(1).join(' ');
 
       let testOutputDir = trimLongString(sanitizedRelativePath + '-' + sanitizeForFilePath(fullTitleWithoutSpec));
-      if (project._internal.id)
-        testOutputDir += '-' + sanitizeForFilePath(project._internal.id);
+      if (projectInternal.id)
+        testOutputDir += '-' + sanitizeForFilePath(projectInternal.id);
       if (this.retry)
         testOutputDir += '-retry' + this.retry;
       if (this.repeatEachIndex)
@@ -345,7 +350,7 @@ export class TestInfoImpl implements TestInfo {
     const parsedRelativeTestFilePath = path.parse(relativeTestFilePath);
     const projectNamePathSegment = sanitizeForFilePath(this.project.name);
 
-    const snapshotPath = this.project.snapshotPathTemplate
+    const snapshotPath = (this._projectInternal.snapshotPathTemplate || '')
         .replace(/\{(.)?testDir\}/g, '$1' + this.project.testDir)
         .replace(/\{(.)?snapshotDir\}/g, '$1' + this.project.snapshotDir)
         .replace(/\{(.)?snapshotSuffix\}/g, this.snapshotSuffix ? '$1' + this.snapshotSuffix : '')
@@ -358,7 +363,7 @@ export class TestInfoImpl implements TestInfo {
         .replace(/\{(.)?arg\}/g, '$1' + path.join(parsedSubPath.dir, parsedSubPath.name))
         .replace(/\{(.)?ext\}/g, parsedSubPath.ext ? '$1' + parsedSubPath.ext : '');
 
-    return path.normalize(path.resolve(this.config._internal.configDir, snapshotPath));
+    return path.normalize(path.resolve(this._configInternal.configDir, snapshotPath));
   }
 
   skip(...args: [arg?: any, description?: string]) {
diff --git a/packages/playwright-test/src/worker/timeoutManager.ts b/packages/playwright-test/src/worker/timeoutManager.ts
index 8ec290857c..effaac4c3a 100644
--- a/packages/playwright-test/src/worker/timeoutManager.ts
+++ b/packages/playwright-test/src/worker/timeoutManager.ts
@@ -16,7 +16,8 @@
 
 import { colors } from 'playwright-core/lib/utilsBundle';
 import { TimeoutRunner, TimeoutRunnerError } from 'playwright-core/lib/utils';
-import type { Location, TestInfoError } from '../common/types';
+import type { TestInfoError } from '../../types/test';
+import type { Location } from '../../types/testReporter';
 
 export type TimeSlot = {
   timeout: number;
diff --git a/packages/playwright-test/src/worker/workerMain.ts b/packages/playwright-test/src/worker/workerMain.ts
index 98a97be100..d92ab2b87c 100644
--- a/packages/playwright-test/src/worker/workerMain.ts
+++ b/packages/playwright-test/src/worker/workerMain.ts
@@ -21,7 +21,7 @@ import type { TestBeginPayload, TestEndPayload, RunPayload, DonePayload, WorkerI
 import { setCurrentTestInfo, setIsWorkerProcess } from '../common/globals';
 import { ConfigLoader } from '../common/configLoader';
 import type { Suite, TestCase } from '../common/test';
-import type { Annotation, FullConfigInternal, FullProjectInternal, TestInfoError } from '../common/types';
+import type { Annotation, FullConfigInternal, FullProjectInternal } from '../common/config';
 import { FixtureRunner } from './fixtureRunner';
 import { ManualPromise } from 'playwright-core/lib/utils';
 import { TestInfoImpl } from './testInfo';
@@ -31,6 +31,7 @@ import { loadTestFile } from '../common/testLoader';
 import { buildFileSuiteForProject, filterTestsRemoveEmptySuites } from '../common/suiteUtils';
 import { PoolBuilder } from '../common/poolBuilder';
 import { addToCompilationCache } from '../common/compilationCache';
+import type { TestInfoError } from '../../types/test';
 
 const removeFolderAsync = util.promisify(rimraf);
 
@@ -150,7 +151,7 @@ export class WorkerMain extends ProcessRunner {
 
   private async _teardownScopes() {
     // TODO: separate timeout for teardown?
-    const timeoutManager = new TimeoutManager(this._project.timeout);
+    const timeoutManager = new TimeoutManager(this._project.project.timeout);
     timeoutManager.setCurrentRunnable({ type: 'teardown' });
     const timeoutError = await timeoutManager.runWithTimeout(async () => {
       await this._fixtureRunner.teardownScope('test', timeoutManager);
@@ -189,9 +190,8 @@ export class WorkerMain extends ProcessRunner {
     if (this._config)
       return;
 
-    const configLoader = await ConfigLoader.deserialize(this._params.config);
-    this._config = configLoader.fullConfig();
-    this._project = this._config.projects.find(p => p._internal.id === this._params.projectId)!;
+    this._config = await ConfigLoader.deserialize(this._params.config);
+    this._project = this._config.projects.find(p => p.id === this._params.projectId)!;
     this._poolBuilder = PoolBuilder.createForWorker(this._project);
   }
 
@@ -201,7 +201,7 @@ export class WorkerMain extends ProcessRunner {
     let fatalUnknownTestIds;
     try {
       await this._loadIfNeeded();
-      const fileSuite = await loadTestFile(runPayload.file, this._config.rootDir);
+      const fileSuite = await loadTestFile(runPayload.file, this._config.config.rootDir);
       const suite = buildFileSuiteForProject(this._project, fileSuite, this._params.repeatEachIndex);
       const hasEntries = filterTestsRemoveEmptySuites(suite, test => entries.has(test.id));
       if (hasEntries) {
@@ -332,7 +332,7 @@ export class WorkerMain extends ProcessRunner {
           this._extraSuiteAnnotations.set(suite, extraAnnotations);
           didFailBeforeAllForSuite = suite;  // Assume failure, unless reset below.
           // Separate timeout for each "beforeAll" modifier.
-          const timeSlot = { timeout: this._project.timeout, elapsed: 0 };
+          const timeSlot = { timeout: this._project.project.timeout, elapsed: 0 };
           await this._runModifiersForSuite(suite, testInfo, 'worker', timeSlot, extraAnnotations);
         }
 
@@ -385,7 +385,7 @@ export class WorkerMain extends ProcessRunner {
     let afterHooksSlot: TimeSlot | undefined;
     if (testInfo._didTimeout) {
       // A timed-out test gets a full additional timeout to run after hooks.
-      afterHooksSlot = { timeout: this._project.timeout, elapsed: 0 };
+      afterHooksSlot = { timeout: this._project.project.timeout, elapsed: 0 };
       testInfo._timeoutManager.setCurrentRunnable({ type: 'afterEach', slot: afterHooksSlot });
     }
     await testInfo._runAsStep(async step => {
@@ -450,7 +450,7 @@ export class WorkerMain extends ProcessRunner {
             const afterAllError = await this._runAfterAllHooksForSuite(suite, testInfo);
             firstAfterHooksError = firstAfterHooksError || afterAllError;
           }
-          const teardownSlot = { timeout: this._project.timeout, elapsed: 0 };
+          const teardownSlot = { timeout: this._project.project.timeout, elapsed: 0 };
           // Attribute to 'test' so that users understand they should probably increate the test timeout to fix this issue.
           testInfo._timeoutManager.setCurrentRunnable({ type: 'test', slot: teardownSlot });
           debugTest(`tearing down test scope started`);
@@ -476,8 +476,8 @@ export class WorkerMain extends ProcessRunner {
     setCurrentTestInfo(null);
     this.dispatchEvent('testEnd', buildTestEndPayload(testInfo));
 
-    const preserveOutput = this._config.preserveOutput === 'always' ||
-      (this._config.preserveOutput === 'failures-only' && testInfo._isFailure());
+    const preserveOutput = this._config.config.preserveOutput === 'always' ||
+      (this._config.config.preserveOutput === 'failures-only' && testInfo._isFailure());
     if (!preserveOutput)
       await removeFolderAsync(testInfo.outputDir).catch(e => {});
   }
@@ -512,7 +512,7 @@ export class WorkerMain extends ProcessRunner {
       debugTest(`${hook.type} hook at "${formatLocation(hook.location)}" started`);
       try {
         // Separate time slot for each "beforeAll" hook.
-        const timeSlot = { timeout: this._project.timeout, elapsed: 0 };
+        const timeSlot = { timeout: this._project.project.timeout, elapsed: 0 };
         testInfo._timeoutManager.setCurrentRunnable({ type: 'beforeAll', location: hook.location, slot: timeSlot });
         await testInfo._runAsStep(() => this._fixtureRunner.resolveParametersAndRunFunction(hook.fn, testInfo, 'all-hooks-only'), {
           category: 'hook',
@@ -540,7 +540,7 @@ export class WorkerMain extends ProcessRunner {
       debugTest(`${hook.type} hook at "${formatLocation(hook.location)}" started`);
       const afterAllError = await testInfo._runFn(async () => {
         // Separate time slot for each "afterAll" hook.
-        const timeSlot = { timeout: this._project.timeout, elapsed: 0 };
+        const timeSlot = { timeout: this._project.project.timeout, elapsed: 0 };
         testInfo._timeoutManager.setCurrentRunnable({ type: 'afterAll', location: hook.location, slot: timeSlot });
         await testInfo._runAsStep(() => this._fixtureRunner.resolveParametersAndRunFunction(hook.fn, testInfo, 'all-hooks-only'), {
           category: 'hook',