Updated --filter documentation and fixed spacing issue as noticed by linter

Author: brunocabral88

CHANGELOG.md

@@ -8,6 +8,7 @@
 - `[@jest/fake-timers]` [**BREAKING**] Upgrade `@sinonjs/fake-timers` to v11 ([#14544](https://github.com/jestjs/jest/pull/14544))
 - `[@jest/schemas]` Upgrade `@sinclair/typebox` to v0.31 ([#14072](https://github.com/jestjs/jest/pull/14072))
 - `[pretty-format]` [**BREAKING**] Do not render empty string children (`''`) in React plugin ([#14470](https://github.com/facebook/jest/pull/14470))
+- `[@jest/core]` [**BREAKING**] Changed `--filter` to accept an object with shape `{ filtered: Array<string> }` to match [documentation](https://jestjs.io/docs/cli#--filterfile) ([#13319](https://github.com/jestjs/jest/pull/13319))
 
 ### Fixes
 

docs/CLI.md

@@ -194,13 +194,14 @@ Alias: `-e`. Use this flag to show full diffs and errors instead of a patch.
 
 ### `--filter=<file>`
 
-Path to a module exporting a filtering function. This asynchronous function receives a list of test paths which can be manipulated to exclude tests from running by returning an object with shape `{ filtered: Array<{ test: string }> }`. Especially useful when used in conjunction with a testing infrastructure to filter known broken tests, e.g.
+Path to a module exporting a filtering function. This asynchronous function receives a list of test paths which can be manipulated to exclude tests from running and must return an object with shape `{ filtered: Array<string> }` containing the tests that should be run by Jest. Especially useful when used in conjunction with a testing infrastructure to filter known broken tests.
 
 ```js title="my-filter.js"
+// This filter when applied will only run tests ending in .spec.js (not the best way to do it, but it's just an example):
+const filteringFunction = (testPath) => testPath.endsWith('.spec.js');
+
 module.exports = testPaths => {
-  const allowedPaths = testPaths
-    .filter(filteringFunction)
-    .map(test => ({test})); // [{ test: "path1.spec.js" }, { test: "path2.spec.js" }, etc]
+  const allowedPaths = testPaths.filter(filteringFunction); // ["path1.spec.js", "path2.spec.js", etc]
 
   return {
     filtered: allowedPaths,

packages/jest-core/src/__tests__/SearchSource.test.ts

@@ -113,7 +113,7 @@ describe('SearchSource', () => {
       const {searchSource, config} = await initSearchSource(initialOptions);
       const {tests: paths} = await searchSource.getTestPaths(
         {
-        ...config,
+          ...config,
           testPathPattern: '',
         },
         null,