run lint and fixes

docs/src/test-api/class-fullconfig.md

@@ -112,6 +112,12 @@ Base directory for all relative paths used in the reporters.
 
 See [`property: TestConfig.shard`].
 
+## property: FullConfig.shardingSeed
+* since: ???
+- type: <[null]|[string]>
+
+See [`property: TestConfig.shardingSeed`].
+
 ## property: FullConfig.updateSnapshots
 * since: v1.10
 - type: <[UpdateSnapshots]<"all"|"none"|"missing">>

packages/playwright/src/common/config.ts

@@ -86,7 +86,7 @@ export class FullConfigInternal {
       quiet: takeFirst(configCLIOverrides.quiet, userConfig.quiet, false),
       projects: [],
       shard: takeFirst(configCLIOverrides.shard, userConfig.shard, null),
-      shardingSeed: takeFirst(configCLIOverrides.shardingSeed, userConfig.shardingSeed, undefined),
+      shardingSeed: takeFirst(configCLIOverrides.shardingSeed, userConfig.shardingSeed, null),
       updateSnapshots: takeFirst(configCLIOverrides.updateSnapshots, userConfig.updateSnapshots, 'missing'),
       version: require('../../package.json').version,
       workers: 0,

packages/playwright/src/isomorphic/teleReceiver.ts

@@ -595,6 +595,7 @@ export const baseFullConfig: reporterTypes.FullConfig = {
   rootDir: '',
   quiet: false,
   shard: null,
+  shardingSeed: null,
   updateSnapshots: 'missing',
   version: '',
   workers: 0,

packages/playwright/types/test.d.ts

@@ -1411,8 +1411,25 @@ interface TestConfig<TestArgs = {}, WorkerArgs = {}> {
    * Shuffle the order of test groups with a seed. By default tests are run in the order they are discovered, which is
    * mostly alphabetical. This could lead to an uneven distribution of slow and fast tests. Shuffling the order of tests
    * in a deterministic way can help to distribute the load more evenly.
+   *
+   * The sharding seed is a string that is used to initialize a random number generator. The configured value needs to
+   * be the same for all shards, to make sure
+   *
+   * Learn more about [parallelism and sharding](https://playwright.dev/docs/test-parallel) with Playwright Test.
+   *
+   * **Usage**
+   *
+   * ```js
+   * // playwright.config.ts
+   * import { defineConfig } from '@playwright/test';
+   *
+   * export default defineConfig({
+   *   shardingSeed: "string value"
+   * });
+   * ```
+   *
    */
-  shardingSeed?: string
+  shardingSeed?: string;
 
   /**
    * **NOTE** Use
@@ -1793,7 +1810,7 @@ export interface FullConfig<TestArgs = {}, WorkerArgs = {}> {
   /**
    * See [testConfig.shardingSeed](https://playwright.dev/docs/api/class-testconfig#test-config-sharding-seed).
    */
-  shardingSeed: string;
+  shardingSeed: null|string;
 
   /**
    * See [testConfig.updateSnapshots](https://playwright.dev/docs/api/class-testconfig#test-config-update-snapshots).