chore: migrate jest-watcher to TypeScript

[SimenB]

Summary

I somehow missed that this depends on jest-util, so there's a @ts-ignore in here 😅

Built diff:

diff --git c/packages/jest-watcher/build/BaseWatchPlugin.js w/packages/jest-watcher/build/BaseWatchPlugin.js
index cab7c44f2..44acd23fc 100644
--- c/packages/jest-watcher/build/BaseWatchPlugin.js
+++ w/packages/jest-watcher/build/BaseWatchPlugin.js
@@ -10,8 +10,6 @@ exports.default = void 0;
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 class BaseWatchPlugin {
   constructor({stdin, stdout}) {
@@ -19,15 +17,15 @@ class BaseWatchPlugin {
     this._stdout = stdout;
   }
 
-  apply(hooks) {}
+  apply() {}
 
-  getUsageInfo(globalConfig) {
+  getUsageInfo() {
     return null;
   }
 
-  onKey(value) {}
+  onKey() {}
 
-  run(globalConfig, updateConfigAndRun) {
+  run() {
     return Promise.resolve();
   }
 }
diff --git c/packages/jest-watcher/build/JestHooks.js w/packages/jest-watcher/build/JestHooks.js
index d1523a1ae..edcc03c72 100644
--- c/packages/jest-watcher/build/JestHooks.js
+++ w/packages/jest-watcher/build/JestHooks.js
@@ -42,8 +42,6 @@ function _asyncToGenerator(fn) {
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 class JestHooks {
   constructor() {
@@ -84,13 +82,12 @@ class JestHooks {
         ),
       shouldRunTestSuite: (function() {
         var _shouldRunTestSuite = _asyncToGenerator(function*(testSuiteInfo) {
-          return Promise.all(
+          const result = yield Promise.all(
             _this._listeners.shouldRunTestSuite.map(listener =>
               listener(testSuiteInfo)
             )
-          ).then(result =>
-            result.every(shouldRunTestSuite => shouldRunTestSuite)
           );
+          return result.every(shouldRunTestSuite => shouldRunTestSuite);
         });
 
         function shouldRunTestSuite(_x) {
diff --git c/packages/jest-watcher/build/PatternPrompt.js w/packages/jest-watcher/build/PatternPrompt.js
index a69f073c3..30dd061c2 100644
--- c/packages/jest-watcher/build/PatternPrompt.js
+++ w/packages/jest-watcher/build/PatternPrompt.js
@@ -1,11 +1,3 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- *
- */
 'use strict';
 
 Object.defineProperty(exports, '__esModule', {
@@ -43,12 +35,17 @@ function _jestUtil() {
   return data;
 }
 
-var _Prompt = _interopRequireDefault(require('./lib/Prompt'));
-
 function _interopRequireDefault(obj) {
   return obj && obj.__esModule ? obj : {default: obj};
 }
 
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+// @ts-ignore: Not yet migrated
 const CLEAR = _jestUtil().specialChars.CLEAR;
 
 const usage = entity =>
@@ -64,6 +61,8 @@ const usageRows = usage('').split('\n').length;
 
 class PatternPrompt {
   constructor(pipe, prompt) {
+    // TODO: Should come in the constructor
+    this._entityName = '';
     this._pipe = pipe;
     this._prompt = prompt;
     this._currentUsageRows = usageRows;
@@ -89,7 +88,7 @@ class PatternPrompt {
     this._prompt.enter(this._onChange.bind(this), onSuccess, onCancel);
   }
 
-  _onChange(pattern, options) {
+  _onChange() {
     this._pipe.write(_ansiEscapes().default.eraseLine);
 
     this._pipe.write(_ansiEscapes().default.cursorLeft);
diff --git c/packages/jest-watcher/build/constants.js w/packages/jest-watcher/build/constants.js
index a619cb776..97b0bdd7b 100644
--- c/packages/jest-watcher/build/constants.js
+++ w/packages/jest-watcher/build/constants.js
@@ -10,8 +10,6 @@ exports.KEYS = void 0;
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 const isWindows = process.platform === 'win32';
 const KEYS = {
diff --git c/packages/jest-watcher/build/lib/Prompt.js w/packages/jest-watcher/build/lib/Prompt.js
index e190653d6..4402fb89e 100644
--- c/packages/jest-watcher/build/lib/Prompt.js
+++ w/packages/jest-watcher/build/lib/Prompt.js
@@ -12,16 +12,27 @@ var _constants = require('../constants');
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 class Prompt {
   constructor() {
+    // Copied from `enter` to satisfy TS
+    this._entering = true;
+    this._value = '';
+    this._selection = null;
+    this._offset = -1;
+    this._promptLength = 0;
+
+    this._onChange = () => {};
+
+    this._onSuccess = () => {};
+
+    this._onCancel = () => {};
+
     this._onResize = this._onResize.bind(this);
   }
 
   _onResize() {
-    this._onChange(this._value);
+    this._onChange();
   }
 
   enter(onChange, onSuccess, onCancel) {
diff --git c/packages/jest-watcher/build/lib/colorize.js w/packages/jest-watcher/build/lib/colorize.js
index fd523c4d9..7562424e4 100644
--- c/packages/jest-watcher/build/lib/colorize.js
+++ w/packages/jest-watcher/build/lib/colorize.js
@@ -24,8 +24,6 @@ function _interopRequireDefault(obj) {
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 var _default = (str, start, end) =>
   _chalk().default.dim(str.slice(0, start)) +
diff --git c/packages/jest-watcher/build/lib/formatTestNameByPattern.js w/packages/jest-watcher/build/lib/formatTestNameByPattern.js
index 7c8703a6a..07219c388 100644
--- c/packages/jest-watcher/build/lib/formatTestNameByPattern.js
+++ w/packages/jest-watcher/build/lib/formatTestNameByPattern.js
@@ -26,8 +26,6 @@ function _interopRequireDefault(obj) {
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 const DOTS = '...';
 const ENTER = '⏎';
@@ -48,7 +46,7 @@ var _default = (testName, pattern, width) => {
     return _chalk().default.dim(inlineTestName);
   }
 
-  const startPatternIndex = Math.max(match.index, 0);
+  const startPatternIndex = Math.max(match.index || 0, 0);
   const endPatternIndex = startPatternIndex + match[0].length;
 
   if (inlineTestName.length <= width) {
diff --git c/packages/jest-watcher/build/lib/patternModeHelpers.js w/packages/jest-watcher/build/lib/patternModeHelpers.js
index 0b159d018..13bbfb209 100644
--- c/packages/jest-watcher/build/lib/patternModeHelpers.js
+++ w/packages/jest-watcher/build/lib/patternModeHelpers.js
@@ -1,11 +1,3 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- *
- */
 'use strict';
 
 Object.defineProperty(exports, '__esModule', {
@@ -47,6 +39,12 @@ function _interopRequireDefault(obj) {
   return obj && obj.__esModule ? obj : {default: obj};
 }
 
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
 const printPatternCaret = (pattern, pipe) => {
   const inputText = `${_chalk().default.dim(' pattern \u203A')} ${pattern}`;
   pipe.write(_ansiEscapes().default.eraseDown);
diff --git c/packages/jest-watcher/build/lib/scroll.js w/packages/jest-watcher/build/lib/scroll.js
index b8413de02..4a545041e 100644
--- c/packages/jest-watcher/build/lib/scroll.js
+++ w/packages/jest-watcher/build/lib/scroll.js
@@ -1,11 +1,3 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- *
- */
 'use strict';
 
 Object.defineProperty(exports, '__esModule', {
@@ -13,6 +5,12 @@ Object.defineProperty(exports, '__esModule', {
 });
 exports.default = scroll;
 
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
 function scroll(size, {offset, max}) {
   let start = 0;
   let index = Math.min(offset, size);

Test plan

Green CI

[SimenB]

basically https://github.com/facebook/jest/blob/dc355000db72a6bbf52ce7d28620497873926c94/packages/jest-cli/src/lib/update_global_config.js#L14-L36

[SimenB]

Huh, as I look a this, they're actually wrong. I took my list from the docs, but this is longer than that.

[SimenB]

9950466

[codecov-io]

Codecov Report

Merging #7843 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7843      +/-   ##
==========================================
+ Coverage   64.36%   64.55%   +0.19%     
==========================================
  Files         228      219       -9     
  Lines        8485     8370     -115     
  Branches        5        6       +1     
==========================================
- Hits         5461     5403      -58     
+ Misses       3022     2965      -57     
  Partials        2        2

Impacted Files	Coverage Δ
packages/jest-cli/src/lib/update_global_config.js	93.75% <ø> (ø)	⬆️
packages/jest-runner/src/runTest.js	2.73% <ø> (ø)	⬆️
packages/jest-cli/src/plugins/quit.js	42.85% <ø> (ø)	⬆️

---

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[github-actions]

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