chore: serialize config as a part of list-files (#18649)

examples/todomvc/tests/integration.spec.ts

@@ -143,6 +143,7 @@ test.describe('Item', () => {
     // Assert completed class.
     await expect(firstTodo).toHaveClass('completed');
     await expect(secondTodo).toHaveClass('completed');
+    
   });
 
   test('should allow me to un-mark items as complete', async ({ page }) => {

packages/playwright-test/src/cli.ts

@@ -195,7 +195,7 @@ async function listTestFiles(opts: { [key: string]: any }) {
 
   const runner = new Runner();
   await runner.loadConfigFromResolvedFile(resolvedConfigFile);
-  const report = await runner.listTestFiles(resolvedConfigFile, opts.project);
+  const report = await runner.listTestFiles(opts.project);
   write(JSON.stringify(report), () => {
     process.exit(0);
   });

packages/playwright-test/src/runner.ts

@@ -194,7 +194,7 @@ export class Runner {
     return fullResult;
   }
 
-  async listTestFiles(configFile: string, projectNames: string[] | undefined): Promise<any> {
+  async listTestFiles(projectNames: string[] | undefined): Promise<any> {
     const projects = this._collectProjects(projectNames);
     const { filesByProject } = await this._collectFiles(projects, () => true);
     const report: any = {
@@ -202,10 +202,8 @@ export class Runner {
     };
     for (const [project, files] of filesByProject) {
       report.projects.push({
-        docker: process.env.PLAYWRIGHT_DOCKER,
-        name: project.name,
-        testDir: path.resolve(configFile, project.testDir),
-        files: files
+        ...sanitizeConfigForJSON(project, new Set()),
+        files: files,
       });
     }
     return report;
@@ -953,5 +951,34 @@ function createStacklessError(message: string): TestError {
   return { message, __isNotAFatalError: true } as any;
 }
 
+function sanitizeConfigForJSON(object: any, visited: Set<any>): any {
+  const type = typeof object;
+  if (type === 'function' || type === 'symbol')
+    return undefined;
+  if (!object || type !== 'object')
+    return object;
+
+  if (object instanceof RegExp)
+    return String(object);
+  if (object instanceof Date)
+    return object.toISOString();
+
+  if (visited.has(object))
+    return undefined;
+  visited.add(object);
+
+  if (Array.isArray(object))
+    return object.map(a => sanitizeConfigForJSON(a, visited));
+
+  const result: any = {};
+  const keys = Object.keys(object).slice(0, 100);
+  for (const key of keys) {
+    if (key.startsWith('_'))
+      continue;
+    result[key] = sanitizeConfigForJSON(object[key], visited);
+  }
+  return result;
+}
+
 export const builtInReporters = ['list', 'line', 'dot', 'json', 'junit', 'null', 'github', 'html'] as const;
 export type BuiltInReporter = typeof builtInReporters[number];