Feature: broader uses for watch plugins

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## master
 
+### Features
+
+- `[jest-cli]` Watch plugins now have access to a broader range of global configuration options in their `updateConfigAndRun` callbacks, so they can provide a wider set of extra features ([#6473](https://github.com/facebook/jest/pull/6473))
+
 ### Fixes
 
 - `[jest-runner]` Force parallel runs for watch mode, to avoid TTY freeze ([#6647](https://github.com/facebook/jest/pull/6647))

docs/WatchPlugins.md

@@ -149,6 +149,27 @@ class MyWatchPlugin {
 }
 ```
 
+**Note**: If you do call `updateConfigAndRun`, your `run` method should not resolve to a truthy value, as that would trigger a double-run.
+
+#### Authorized configuration keys
+
+For stability and safety reasons, only part of the global configuration keys can be updated with `updateConfigAndRun`. The current white list is as follows:
+
+- [`bail`](configuration.html#bail-boolean)
+- [`collectCoverage`](configuration.html#collectcoverage-boolean)
+- [`collectCoverageFrom`](configuration.html#collectcoveragefrom-array)
+- [`collectCoverageOnlyFrom`](configuration.html#collectcoverageonlyfrom-array)
+- [`coverageDirectory`](configuration.html#coveragedirectory-string)
+- [`coverageReporters`](configuration.html#coveragereporters-array)
+- [`notify`](configuration.html#notify-boolean)
+- [`notifyMode`](configuration.html#notifymode-string)
+- [`onlyFailures`](configuration.html#onlyfailures-boolean)
+- [`reporters`](configuration.html#reporters-array-modulename-modulename-options)
+- [`testNamePattern`](cli.html#testnamepattern-regex)
+- [`testPathPattern`](cli.html#testpathpattern-regex)
+- [`updateSnapshot`](cli.html#updatesnapshot)
+- [`verbose`](configuration.html#verbose-boolean)
+
 ## Customization
 
 Plugins can be customized via your Jest configuration.

packages/jest-cli/src/__tests__/__snapshots__/watch_filename_pattern_mode.test.js.snap

@@ -80,6 +80,16 @@ exports[`Watch mode flows Pressing "P" enters pattern mode 8`] = `
 [MOCK - cursorRestorePosition]"
 `;
 
+exports[`Watch mode flows Pressing "P" enters pattern mode 9`] = `
+Object {
+  "onlyChanged": false,
+  "passWithNoTests": true,
+  "testPathPattern": "p.*3",
+  "watch": true,
+  "watchAll": false,
+}
+`;
+
 exports[`Watch mode flows Pressing "c" clears the filters 1`] = `
 "[MOCK - cursorHide]
 [MOCK - clearScreen]

packages/jest-cli/src/__tests__/watch.test.js

@@ -86,6 +86,11 @@ jest.doMock(
   {virtual: true},
 );
 
+const regularUpdateGlobalConfig = require('../lib/update_global_config')
+  .default;
+const updateGlobalConfig = jest.fn(regularUpdateGlobalConfig);
+jest.doMock('../lib/update_global_config', () => updateGlobalConfig);
+
 const watch = require('../watch').default;
 
 const nextTick = () => new Promise(res => process.nextTick(res));
@@ -435,6 +440,101 @@ describe('Watch mode flows', () => {
     });
   });
 
+  it.each`
+    ok | option
+    ✔︎ | bail
+    ✖︎ | changedFilesWithAncestor
+    ✖︎ | changedSince
+    ✔︎ | collectCoverage
+    ✔︎ | collectCoverageFrom
+    ✔︎ | collectCoverageOnlyFrom
+    ✔︎ | coverageDirectory
+    ✔︎ | coverageReporters
+    ✖︎ | coverageThreshold
+    ✖︎ | detectLeaks
+    ✖︎ | detectOpenHandles
+    ✖︎ | enabledTestsMap
+    ✖︎ | errorOnDeprecated
+    ✖︎ | expand
+    ✖︎ | filter
+    ✖︎ | findRelatedTests
+    ✖︎ | forceExit
+    ✖︎ | globalSetup
+    ✖︎ | globalTeardown
+    ✖︎ | json
+    ✖︎ | lastCommit
+    ✖︎ | listTests
+    ✖︎ | logHeapUsage
+    ✖︎ | maxWorkers
+    ✖︎ | nonFlagArgs
+    ✖︎ | noSCM
+    ✖︎ | noStackTrace
+    ✔︎ | notify
+    ✔︎ | notifyMode
+    ✖︎ | onlyChanged
+    ✔︎ | onlyFailures
+    ✖︎ | outputFile
+    ✖︎ | passWithNoTests
+    ✖︎ | projects
+    ✖︎ | replname
+    ✔︎ | reporters
+    ✖︎ | rootDir
+    ✖︎ | runTestsByPath
+    ✖︎ | silent
+    ✖︎ | skipFilter
+    ✖︎ | testFailureExitCode
+    ✔︎ | testNamePattern
+    ✔︎ | testPathPattern
+    ✖︎ | testResultsProcessor
+    ✔︎ | updateSnapshot
+    ✖︎ | useStderr
+    ✔︎ | verbose
+    ✖︎ | watch
+    ✖︎ | watchAll
+    ✖︎ | watchman
+    ✖︎ | watchPlugins
+  `(
+    'allows WatchPlugins to modify only white-listed global config keys',
+    async ({ok, option}) => {
+      const pluginPath = `${__dirname}/__fixtures__/plugin_path_config_updater`;
+      const config = Object.assign({}, globalConfig, {
+        rootDir: __dirname,
+        watchPlugins: [{config: {}, path: pluginPath}],
+      });
+
+      jest.doMock(
+        pluginPath,
+        () =>
+          class WatchPlugin {
+            getUsageInfo() {
+              return {key: 'x', prompt: 'test option white-listing'};
+            }
+
+            run(globalConfig, updateConfigAndRun) {
+              updateConfigAndRun({[option]: '__JUST_TRYING__'});
+              return Promise.resolve();
+            }
+          },
+        {virtual: true},
+      );
+
+      watch(config, contexts, pipe, hasteMapInstances, stdin);
+      await nextTick();
+
+      stdin.emit('x');
+      await nextTick();
+
+      const lastCall = updateGlobalConfig.mock.calls.slice(-1)[0];
+      let expector = expect(lastCall[0]);
+      if (!ok) {
+        expector = expector.not;
+      }
+      expector.toMatchObject({
+        [option]: '__JUST_TRYING__',
+      });
+    },
+  );
+
   it('triggers enter on a WatchPlugin when its key is pressed', async () => {
     const run = jest.fn(() => Promise.resolve());
     const pluginPath = `${__dirname}/__fixtures__/plugin_path`;
@@ -588,7 +688,6 @@ describe('Watch mode flows', () => {
 
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
       testNamePattern: 'test',
-      testPathPattern: '',
       watch: true,
       watchAll: false,
     });
@@ -606,7 +705,6 @@ describe('Watch mode flows', () => {
     await nextTick();
 
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
-      testNamePattern: '',
       testPathPattern: 'file',
       watch: true,
       watchAll: false,

packages/jest-cli/src/__tests__/watch_filename_pattern_mode.test.js

@@ -125,14 +125,7 @@ describe('Watch mode flows', () => {
     expect(runJestMock).toBeCalled();
 
     // globalConfig is updated with the current pattern
-    expect(runJestMock.mock.calls[0][0].globalConfig).toEqual({
-      onlyChanged: false,
-      passWithNoTests: true,
-      testNamePattern: '',
-      testPathPattern: 'p.*3',
-      watch: true,
-      watchAll: false,
-    });
+    expect(runJestMock.mock.calls[0][0].globalConfig).toMatchSnapshot();
   });
 
   it('Pressing "c" clears the filters', async () => {

packages/jest-cli/src/lib/update_global_config.js

@@ -7,16 +7,31 @@
  * @flow
  */
 
-import type {GlobalConfig, SnapshotUpdateState} from 'types/Config';
+import {replacePathSepForRegex} from 'jest-regex-util';
 
-type Options = {
-  testNamePattern?: string,
-  testPathPattern?: string,
-  noSCM?: boolean,
-  updateSnapshot?: SnapshotUpdateState,
+import type {GlobalConfig} from 'types/Config';
+
+export type Options = {
+  bail?: $PropertyType<GlobalConfig, 'bail'>,
+  collectCoverage?: $PropertyType<GlobalConfig, 'collectCoverage'>,
+  collectCoverageFrom?: $PropertyType<GlobalConfig, 'collectCoverageFrom'>,
+  collectCoverageOnlyFrom?: $PropertyType<
+    GlobalConfig,
+    'collectCoverageOnlyFrom',
+  >,
+  coverageDirectory?: $PropertyType<GlobalConfig, 'coverageDirectory'>,
+  coverageReporters?: $PropertyType<GlobalConfig, 'coverageReporters'>,
   mode?: 'watch' | 'watchAll',
-  passWithNoTests?: boolean,
-  onlyFailures?: boolean,
+  noSCM?: $PropertyType<GlobalConfig, 'noSCM'>,
+  notify?: $PropertyType<GlobalConfig, 'notify'>,
+  notifyMode?: $PropertyType<GlobalConfig, 'notifyMode'>,
+  onlyFailures?: $PropertyType<GlobalConfig, 'onlyFailures'>,
+  passWithNoTests?: $PropertyType<GlobalConfig, 'passWithNoTests'>,
+  reporters?: $PropertyType<GlobalConfig, 'reporters'>,
+  testNamePattern?: $PropertyType<GlobalConfig, 'testNamePattern'>,
+  testPathPattern?: $PropertyType<GlobalConfig, 'testPathPattern'>,
+  updateSnapshot?: $PropertyType<GlobalConfig, 'updateSnapshot'>,
+  verbose?: $PropertyType<GlobalConfig, 'verbose'>,
 };
 
 export default (globalConfig: GlobalConfig, options: Options): GlobalConfig => {
@@ -27,10 +42,6 @@ export default (globalConfig: GlobalConfig, options: Options): GlobalConfig => {
     options = {};
   }
 
-  if (options.updateSnapshot) {
-    newConfig.updateSnapshot = options.updateSnapshot;
-  }
-
   if (options.mode === 'watch') {
     newConfig.watch = true;
     newConfig.watchAll = false;
@@ -39,12 +50,13 @@ export default (globalConfig: GlobalConfig, options: Options): GlobalConfig => {
     newConfig.watchAll = true;
   }
 
-  if ('testPathPattern' in options) {
-    newConfig.testPathPattern = options.testPathPattern || '';
+  if (options.testNamePattern !== undefined) {
+    newConfig.testNamePattern = options.testNamePattern || '';
   }
 
-  if ('testNamePattern' in options) {
-    newConfig.testNamePattern = options.testNamePattern || '';
+  if (options.testPathPattern !== undefined) {
+    newConfig.testPathPattern =
+      replacePathSepForRegex(options.testPathPattern) || '';
   }
 
   newConfig.onlyChanged = false;
@@ -53,17 +65,61 @@ export default (globalConfig: GlobalConfig, options: Options): GlobalConfig => {
     !newConfig.testNamePattern &&
     !newConfig.testPathPattern;
 
+  if (options.bail !== undefined) {
+    newConfig.bail = options.bail || false;
+  }
+
+  if (options.collectCoverage !== undefined) {
+    newConfig.collectCoverage = options.collectCoverage || false;
+  }
+
+  if (options.collectCoverageFrom !== undefined) {
+    newConfig.collectCoverageFrom = options.collectCoverageFrom;
+  }
+
+  if (options.collectCoverageOnlyFrom !== undefined) {
+    newConfig.collectCoverageOnlyFrom = options.collectCoverageOnlyFrom;
+  }
+
+  if (options.coverageDirectory !== undefined) {
+    newConfig.coverageDirectory = options.coverageDirectory;
+  }
+
+  if (options.coverageReporters !== undefined) {
+    newConfig.coverageReporters = options.coverageReporters;
+  }
+
   if (options.noSCM) {
     newConfig.noSCM = true;
   }
 
-  if (options.passWithNoTests) {
-    newConfig.passWithNoTests = true;
+  if (options.notify !== undefined) {
+    newConfig.notify = options.notify || false;
+  }
+
+  if (options.notifyMode !== undefined) {
+    newConfig.notifyMode = options.notifyMode;
   }
 
-  if ('onlyFailures' in options) {
+  if (options.onlyFailures !== undefined) {
     newConfig.onlyFailures = options.onlyFailures || false;
   }
 
+  if (options.passWithNoTests !== undefined) {
+    newConfig.passWithNoTests = true;
+  }
+
+  if (options.reporters !== undefined) {
+    newConfig.reporters = options.reporters;
+  }
+
+  if (options.updateSnapshot !== undefined) {
+    newConfig.updateSnapshot = options.updateSnapshot;
+  }
+
+  if (options.verbose !== undefined) {
+    newConfig.verbose = options.verbose || false;
+  }
+
   return Object.freeze(newConfig);
 };