From 2fca8051dd4957fd3d7870f4ecfc7046f4c182c2 Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:13:28 +0300
Subject: [PATCH 1/8] before migration

---
 packages/jest-leak-detector/build/index.d.ts  |  14 +++
 .../jest-leak-detector/build/index.d.ts.map   |   1 +
 packages/jest-leak-detector/build/index.js    | 108 ++++++++++++++++++
 packages/jest-leak-detector/build/index.ts_   |  72 ++++++++++++
 4 files changed, 195 insertions(+)
 create mode 100644 packages/jest-leak-detector/build/index.d.ts
 create mode 100644 packages/jest-leak-detector/build/index.d.ts.map
 create mode 100644 packages/jest-leak-detector/build/index.js
 create mode 100644 packages/jest-leak-detector/build/index.ts_

diff --git a/packages/jest-leak-detector/build/index.d.ts b/packages/jest-leak-detector/build/index.d.ts
new file mode 100644
index 000000000000..4b47aa700ca7
--- /dev/null
+++ b/packages/jest-leak-detector/build/index.d.ts
@@ -0,0 +1,14 @@
+/**
+ * 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.
+ */
+export default class {
+    _isReferenceBeingHeld: boolean;
+    constructor(value: any);
+    isLeaking(): boolean;
+    _runGarbageCollector(): void;
+    _isPrimitive(value: any): boolean;
+}
+//# sourceMappingURL=index.d.ts.map
\ No newline at end of file
diff --git a/packages/jest-leak-detector/build/index.d.ts.map b/packages/jest-leak-detector/build/index.d.ts.map
new file mode 100644
index 000000000000..83e37cde6d10
--- /dev/null
+++ b/packages/jest-leak-detector/build/index.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAAA;;;;;GAKG;AAQH,MAAM,CAAC,OAAO;IACZ,qBAAqB,EAAE,OAAO,CAAC;gBAEnB,KAAK,EAAE,GAAG;IAiCtB,SAAS,IAAI,OAAO;IAMpB,oBAAoB;IAapB,YAAY,CAAC,KAAK,EAAE,GAAG,GAAG,OAAO;CAGlC"}
\ No newline at end of file
diff --git a/packages/jest-leak-detector/build/index.js b/packages/jest-leak-detector/build/index.js
new file mode 100644
index 000000000000..72c2184fb576
--- /dev/null
+++ b/packages/jest-leak-detector/build/index.js
@@ -0,0 +1,108 @@
+/**
+ * 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', {
+  value: true
+});
+exports.default = void 0;
+
+function _prettyFormat() {
+  const data = _interopRequireDefault(require('pretty-format'));
+
+  _prettyFormat = function _prettyFormat() {
+    return data;
+  };
+
+  return data;
+}
+
+function _v() {
+  const data = _interopRequireDefault(require('v8'));
+
+  _v = function _v() {
+    return data;
+  };
+
+  return data;
+}
+
+function _vm() {
+  const data = _interopRequireDefault(require('vm'));
+
+  _vm = function _vm() {
+    return data;
+  };
+
+  return data;
+}
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
+class _default {
+  constructor(value) {
+    if (this._isPrimitive(value)) {
+      throw new TypeError(
+        [
+          'Primitives cannot leak memory.',
+          'You passed a ' +
+            typeof value +
+            ': <' +
+            (0, _prettyFormat().default)(value) +
+            '>'
+        ].join(' ')
+      );
+    }
+
+    let weak;
+
+    try {
+      // eslint-disable-next-line import/no-extraneous-dependencies
+      weak = require('weak');
+    } catch (err) {
+      if (!err || err.code !== 'MODULE_NOT_FOUND') {
+        throw err;
+      }
+
+      throw new Error(
+        'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
+          'Please install it as a dependency on your main project'
+      );
+    }
+
+    weak(value, () => (this._isReferenceBeingHeld = false));
+    this._isReferenceBeingHeld = true; // Ensure value is not leaked by the closure created by the "weak" callback.
+
+    value = null;
+  }
+
+  isLeaking() {
+    this._runGarbageCollector();
+
+    return this._isReferenceBeingHeld;
+  }
+
+  _runGarbageCollector() {
+    const isGarbageCollectorHidden = !global.gc; // GC is usually hidden, so we have to expose it before running.
+
+    _v().default.setFlagsFromString('--expose-gc');
+
+    _vm().default.runInNewContext('gc')(); // The GC was not initially exposed, so let's hide it again.
+
+    if (isGarbageCollectorHidden) {
+      _v().default.setFlagsFromString('--no-expose-gc');
+    }
+  }
+
+  _isPrimitive(value) {
+    return value !== Object(value);
+  }
+}
+
+exports.default = _default;
diff --git a/packages/jest-leak-detector/build/index.ts_ b/packages/jest-leak-detector/build/index.ts_
new file mode 100644
index 000000000000..c5ad07ba7b02
--- /dev/null
+++ b/packages/jest-leak-detector/build/index.ts_
@@ -0,0 +1,72 @@
+/**
+ * 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';
+
+import prettyFormat from 'pretty-format';
+import v8 from 'v8';
+import vm from 'vm';
+
+export default class {
+  _isReferenceBeingHeld: boolean;
+
+  constructor(value: ?Object) {
+    if (this._isPrimitive(value)) {
+      throw new TypeError(
+        [
+          'Primitives cannot leak memory.',
+          'You passed a ' + typeof value + ': <' + prettyFormat(value) + '>',
+        ].join(' '),
+      );
+    }
+
+    let weak;
+
+    try {
+      // eslint-disable-next-line import/no-extraneous-dependencies
+      weak = require('weak');
+    } catch (err) {
+      if (!err || err.code !== 'MODULE_NOT_FOUND') {
+        throw err;
+      }
+
+      throw new Error(
+        'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
+          'Please install it as a dependency on your main project',
+      );
+    }
+
+    weak(value, () => (this._isReferenceBeingHeld = false));
+    this._isReferenceBeingHeld = true;
+
+    // Ensure value is not leaked by the closure created by the "weak" callback.
+    value = null;
+  }
+
+  isLeaking(): boolean {
+    this._runGarbageCollector();
+
+    return this._isReferenceBeingHeld;
+  }
+
+  _runGarbageCollector() {
+    const isGarbageCollectorHidden = !global.gc;
+
+    // GC is usually hidden, so we have to expose it before running.
+    v8.setFlagsFromString('--expose-gc');
+    vm.runInNewContext('gc')();
+
+    // The GC was not initially exposed, so let's hide it again.
+    if (isGarbageCollectorHidden) {
+      v8.setFlagsFromString('--no-expose-gc');
+    }
+  }
+
+  _isPrimitive(value: any): boolean {
+    return value !== Object(value);
+  }
+}

From daade867a7effafb890f5fc7f9ce38a410e7887d Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:17:39 +0300
Subject: [PATCH 2/8] Migrate jest-leak-detector to TypeScript

---
 packages/jest-leak-detector/package.json               |  1 +
 .../src/__tests__/{index.test.js => index.test.ts}     | 10 +++++-----
 packages/jest-leak-detector/src/{index.js => index.ts} |  6 ++----
 packages/jest-leak-detector/tsconfig.json              |  7 +++++++
 4 files changed, 15 insertions(+), 9 deletions(-)
 rename packages/jest-leak-detector/src/__tests__/{index.test.js => index.test.ts} (96%)
 rename packages/jest-leak-detector/src/{index.js => index.ts} (93%)
 create mode 100644 packages/jest-leak-detector/tsconfig.json

diff --git a/packages/jest-leak-detector/package.json b/packages/jest-leak-detector/package.json
index 434f904dcf62..eaeb90409094 100644
--- a/packages/jest-leak-detector/package.json
+++ b/packages/jest-leak-detector/package.json
@@ -8,6 +8,7 @@
   },
   "license": "MIT",
   "main": "build/index.js",
+  "types": "build/index.d.ts",
   "dependencies": {
     "pretty-format": "^24.0.0"
   },
diff --git a/packages/jest-leak-detector/src/__tests__/index.test.js b/packages/jest-leak-detector/src/__tests__/index.test.ts
similarity index 96%
rename from packages/jest-leak-detector/src/__tests__/index.test.js
rename to packages/jest-leak-detector/src/__tests__/index.test.ts
index b4499ec20d2e..e55aa7c1c649 100644
--- a/packages/jest-leak-detector/src/__tests__/index.test.js
+++ b/packages/jest-leak-detector/src/__tests__/index.test.ts
@@ -34,7 +34,7 @@ it('does not show the GC if hidden', () => {
 it('does not hide the GC if visible', () => {
   const detector = new LeakDetector({});
 
-  global.gc = () => {};
+  global.gc = () => { };
   detector.isLeaking();
   expect(global.gc).toBeDefined();
 });
@@ -56,8 +56,8 @@ it('correctly checks simple leaks', () => {
 
 it('tests different objects', () => {
   const refs = [
-    function() {},
-    () => {},
+    function () { },
+    () => { },
     Object.create(null),
     [],
     /foo/g,
@@ -73,8 +73,8 @@ it('tests different objects', () => {
 });
 
 it('correctly checks more complex leaks', () => {
-  let ref1 = {};
-  let ref2 = {};
+  let ref1: any = {};
+  let ref2: any = {};
 
   // Create a circular dependency between ref1 and ref2.
   ref1.ref2 = ref2;
diff --git a/packages/jest-leak-detector/src/index.js b/packages/jest-leak-detector/src/index.ts
similarity index 93%
rename from packages/jest-leak-detector/src/index.js
rename to packages/jest-leak-detector/src/index.ts
index d9e97788a406..205e159118a5 100644
--- a/packages/jest-leak-detector/src/index.js
+++ b/packages/jest-leak-detector/src/index.ts
@@ -3,8 +3,6 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @flow
  */
 
 'use strict';
@@ -16,7 +14,7 @@ import vm from 'vm';
 export default class {
   _isReferenceBeingHeld: boolean;
 
-  constructor(value: ?Object) {
+  constructor(value: any) {
     if (this._isPrimitive(value)) {
       throw new TypeError(
         [
@@ -38,7 +36,7 @@ export default class {
 
       throw new Error(
         'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
-          'Please install it as a dependency on your main project',
+        'Please install it as a dependency on your main project',
       );
     }
 
diff --git a/packages/jest-leak-detector/tsconfig.json b/packages/jest-leak-detector/tsconfig.json
new file mode 100644
index 000000000000..7bb06bce6d20
--- /dev/null
+++ b/packages/jest-leak-detector/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "build"
+  }
+}

From 4b26b29f02b5e68ebabc47e33b9517d572b91f1c Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:27:08 +0300
Subject: [PATCH 3/8] Code linting

---
 packages/jest-leak-detector/src/__tests__/index.test.ts | 6 +++---
 packages/jest-leak-detector/src/index.ts                | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/jest-leak-detector/src/__tests__/index.test.ts b/packages/jest-leak-detector/src/__tests__/index.test.ts
index e55aa7c1c649..188aaf4cf920 100644
--- a/packages/jest-leak-detector/src/__tests__/index.test.ts
+++ b/packages/jest-leak-detector/src/__tests__/index.test.ts
@@ -34,7 +34,7 @@ it('does not show the GC if hidden', () => {
 it('does not hide the GC if visible', () => {
   const detector = new LeakDetector({});
 
-  global.gc = () => { };
+  global.gc = () => {};
   detector.isLeaking();
   expect(global.gc).toBeDefined();
 });
@@ -56,8 +56,8 @@ it('correctly checks simple leaks', () => {
 
 it('tests different objects', () => {
   const refs = [
-    function () { },
-    () => { },
+    function() {},
+    () => {},
     Object.create(null),
     [],
     /foo/g,
diff --git a/packages/jest-leak-detector/src/index.ts b/packages/jest-leak-detector/src/index.ts
index 205e159118a5..f281c3ea4886 100644
--- a/packages/jest-leak-detector/src/index.ts
+++ b/packages/jest-leak-detector/src/index.ts
@@ -7,9 +7,9 @@
 
 'use strict';
 
-import prettyFormat from 'pretty-format';
 import v8 from 'v8';
 import vm from 'vm';
+import prettyFormat from 'pretty-format';
 
 export default class {
   _isReferenceBeingHeld: boolean;
@@ -36,7 +36,7 @@ export default class {
 
       throw new Error(
         'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
-        'Please install it as a dependency on your main project',
+          'Please install it as a dependency on your main project',
       );
     }
 

From cf36683cfc4d8a3ea9dee7d5e541e83aeb368484 Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:28:52 +0300
Subject: [PATCH 4/8] Update ChangeLog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index db7f53290797..5057addc65dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 - `[diff-sequences]`: Migrate to Typescript ([#7820](https://github.com/facebook/jest/pull/7820))
 - `[jest-get-type]`: Migrate to TypeScript ([#7818](https://github.com/facebook/jest/pull/7818))
 - `[jest-regex-util]`: Migrate to TypeScript ([#7822](https://github.com/facebook/jest/pull/7822))
+- `[jest-leak-detector]`: Migrate to TypeScript ([#7825](https://github.com/facebook/jest/pull/7825))
 
 ### Performance
 

From 2b342c9a37f1a0f94e7be273868d24f1fcd50ce0 Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:35:39 +0300
Subject: [PATCH 5/8] Applied comments after the review

---
 packages/jest-leak-detector/src/index.ts  | 6 ++----
 packages/jest-leak-detector/tsconfig.json | 5 ++++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/packages/jest-leak-detector/src/index.ts b/packages/jest-leak-detector/src/index.ts
index f281c3ea4886..78b64453dd11 100644
--- a/packages/jest-leak-detector/src/index.ts
+++ b/packages/jest-leak-detector/src/index.ts
@@ -5,14 +5,12 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-'use strict';
-
 import v8 from 'v8';
 import vm from 'vm';
 import prettyFormat from 'pretty-format';
 
 export default class {
-  _isReferenceBeingHeld: boolean;
+  private _isReferenceBeingHeld: boolean;
 
   constructor(value: any) {
     if (this._isPrimitive(value)) {
@@ -53,7 +51,7 @@ export default class {
     return this._isReferenceBeingHeld;
   }
 
-  _runGarbageCollector() {
+  private _runGarbageCollector() {
     const isGarbageCollectorHidden = !global.gc;
 
     // GC is usually hidden, so we have to expose it before running.
diff --git a/packages/jest-leak-detector/tsconfig.json b/packages/jest-leak-detector/tsconfig.json
index 7bb06bce6d20..3e70b10372b1 100644
--- a/packages/jest-leak-detector/tsconfig.json
+++ b/packages/jest-leak-detector/tsconfig.json
@@ -3,5 +3,8 @@
   "compilerOptions": {
     "rootDir": "src",
     "outDir": "build"
-  }
+  },
+  "references": [
+    {"path": "../pretty-format"}
+  ]
 }

From 55ef0f7251f63015163a804996908f04d05faf76 Mon Sep 17 00:00:00 2001
From: Andrew Makarov <me@r3nya.ru>
Date: Thu, 7 Feb 2019 12:40:24 +0300
Subject: [PATCH 6/8] Cleanup

---
 packages/jest-leak-detector/build/index.d.ts  |  14 ---
 .../jest-leak-detector/build/index.d.ts.map   |   1 -
 packages/jest-leak-detector/build/index.js    | 108 ------------------
 packages/jest-leak-detector/build/index.ts_   |  72 ------------
 ...{index.test.js.snap => index.test.ts.snap} |   0
 packages/jest-leak-detector/src/index.ts      |   2 +-
 6 files changed, 1 insertion(+), 196 deletions(-)
 delete mode 100644 packages/jest-leak-detector/build/index.d.ts
 delete mode 100644 packages/jest-leak-detector/build/index.d.ts.map
 delete mode 100644 packages/jest-leak-detector/build/index.js
 delete mode 100644 packages/jest-leak-detector/build/index.ts_
 rename packages/jest-leak-detector/src/__tests__/__snapshots__/{index.test.js.snap => index.test.ts.snap} (100%)

diff --git a/packages/jest-leak-detector/build/index.d.ts b/packages/jest-leak-detector/build/index.d.ts
deleted file mode 100644
index 4b47aa700ca7..000000000000
--- a/packages/jest-leak-detector/build/index.d.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * 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.
- */
-export default class {
-    _isReferenceBeingHeld: boolean;
-    constructor(value: any);
-    isLeaking(): boolean;
-    _runGarbageCollector(): void;
-    _isPrimitive(value: any): boolean;
-}
-//# sourceMappingURL=index.d.ts.map
\ No newline at end of file
diff --git a/packages/jest-leak-detector/build/index.d.ts.map b/packages/jest-leak-detector/build/index.d.ts.map
deleted file mode 100644
index 83e37cde6d10..000000000000
--- a/packages/jest-leak-detector/build/index.d.ts.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAAA;;;;;GAKG;AAQH,MAAM,CAAC,OAAO;IACZ,qBAAqB,EAAE,OAAO,CAAC;gBAEnB,KAAK,EAAE,GAAG;IAiCtB,SAAS,IAAI,OAAO;IAMpB,oBAAoB;IAapB,YAAY,CAAC,KAAK,EAAE,GAAG,GAAG,OAAO;CAGlC"}
\ No newline at end of file
diff --git a/packages/jest-leak-detector/build/index.js b/packages/jest-leak-detector/build/index.js
deleted file mode 100644
index 72c2184fb576..000000000000
--- a/packages/jest-leak-detector/build/index.js
+++ /dev/null
@@ -1,108 +0,0 @@
-/**
- * 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', {
-  value: true
-});
-exports.default = void 0;
-
-function _prettyFormat() {
-  const data = _interopRequireDefault(require('pretty-format'));
-
-  _prettyFormat = function _prettyFormat() {
-    return data;
-  };
-
-  return data;
-}
-
-function _v() {
-  const data = _interopRequireDefault(require('v8'));
-
-  _v = function _v() {
-    return data;
-  };
-
-  return data;
-}
-
-function _vm() {
-  const data = _interopRequireDefault(require('vm'));
-
-  _vm = function _vm() {
-    return data;
-  };
-
-  return data;
-}
-
-function _interopRequireDefault(obj) {
-  return obj && obj.__esModule ? obj : {default: obj};
-}
-
-class _default {
-  constructor(value) {
-    if (this._isPrimitive(value)) {
-      throw new TypeError(
-        [
-          'Primitives cannot leak memory.',
-          'You passed a ' +
-            typeof value +
-            ': <' +
-            (0, _prettyFormat().default)(value) +
-            '>'
-        ].join(' ')
-      );
-    }
-
-    let weak;
-
-    try {
-      // eslint-disable-next-line import/no-extraneous-dependencies
-      weak = require('weak');
-    } catch (err) {
-      if (!err || err.code !== 'MODULE_NOT_FOUND') {
-        throw err;
-      }
-
-      throw new Error(
-        'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
-          'Please install it as a dependency on your main project'
-      );
-    }
-
-    weak(value, () => (this._isReferenceBeingHeld = false));
-    this._isReferenceBeingHeld = true; // Ensure value is not leaked by the closure created by the "weak" callback.
-
-    value = null;
-  }
-
-  isLeaking() {
-    this._runGarbageCollector();
-
-    return this._isReferenceBeingHeld;
-  }
-
-  _runGarbageCollector() {
-    const isGarbageCollectorHidden = !global.gc; // GC is usually hidden, so we have to expose it before running.
-
-    _v().default.setFlagsFromString('--expose-gc');
-
-    _vm().default.runInNewContext('gc')(); // The GC was not initially exposed, so let's hide it again.
-
-    if (isGarbageCollectorHidden) {
-      _v().default.setFlagsFromString('--no-expose-gc');
-    }
-  }
-
-  _isPrimitive(value) {
-    return value !== Object(value);
-  }
-}
-
-exports.default = _default;
diff --git a/packages/jest-leak-detector/build/index.ts_ b/packages/jest-leak-detector/build/index.ts_
deleted file mode 100644
index c5ad07ba7b02..000000000000
--- a/packages/jest-leak-detector/build/index.ts_
+++ /dev/null
@@ -1,72 +0,0 @@
-/**
- * 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';
-
-import prettyFormat from 'pretty-format';
-import v8 from 'v8';
-import vm from 'vm';
-
-export default class {
-  _isReferenceBeingHeld: boolean;
-
-  constructor(value: ?Object) {
-    if (this._isPrimitive(value)) {
-      throw new TypeError(
-        [
-          'Primitives cannot leak memory.',
-          'You passed a ' + typeof value + ': <' + prettyFormat(value) + '>',
-        ].join(' '),
-      );
-    }
-
-    let weak;
-
-    try {
-      // eslint-disable-next-line import/no-extraneous-dependencies
-      weak = require('weak');
-    } catch (err) {
-      if (!err || err.code !== 'MODULE_NOT_FOUND') {
-        throw err;
-      }
-
-      throw new Error(
-        'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
-          'Please install it as a dependency on your main project',
-      );
-    }
-
-    weak(value, () => (this._isReferenceBeingHeld = false));
-    this._isReferenceBeingHeld = true;
-
-    // Ensure value is not leaked by the closure created by the "weak" callback.
-    value = null;
-  }
-
-  isLeaking(): boolean {
-    this._runGarbageCollector();
-
-    return this._isReferenceBeingHeld;
-  }
-
-  _runGarbageCollector() {
-    const isGarbageCollectorHidden = !global.gc;
-
-    // GC is usually hidden, so we have to expose it before running.
-    v8.setFlagsFromString('--expose-gc');
-    vm.runInNewContext('gc')();
-
-    // The GC was not initially exposed, so let's hide it again.
-    if (isGarbageCollectorHidden) {
-      v8.setFlagsFromString('--no-expose-gc');
-    }
-  }
-
-  _isPrimitive(value: any): boolean {
-    return value !== Object(value);
-  }
-}
diff --git a/packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.js.snap b/packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.ts.snap
similarity index 100%
rename from packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.js.snap
rename to packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.ts.snap
diff --git a/packages/jest-leak-detector/src/index.ts b/packages/jest-leak-detector/src/index.ts
index 78b64453dd11..912bcdf00381 100644
--- a/packages/jest-leak-detector/src/index.ts
+++ b/packages/jest-leak-detector/src/index.ts
@@ -64,7 +64,7 @@ export default class {
     }
   }
 
-  _isPrimitive(value: any): boolean {
+  private _isPrimitive(value: any): boolean {
     return value !== Object(value);
   }
 }

From 0efc5c9c6398cd4b65a649c027d4fa3b65687a9d Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Thu, 7 Feb 2019 13:54:45 +0300
Subject: [PATCH 7/8] Update packages/jest-leak-detector/src/index.ts

Co-Authored-By: r3nya <r3nya@ya.ru>
---
 packages/jest-leak-detector/src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/jest-leak-detector/src/index.ts b/packages/jest-leak-detector/src/index.ts
index 912bcdf00381..feff4b1e4f7b 100644
--- a/packages/jest-leak-detector/src/index.ts
+++ b/packages/jest-leak-detector/src/index.ts
@@ -64,7 +64,7 @@ export default class {
     }
   }
 
-  private _isPrimitive(value: any): boolean {
+  private _isPrimitive(value: unknown): boolean {
     return value !== Object(value);
   }
 }

From 5ef1162471fcb615de2875d53301f575cd6bfe90 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Thu, 7 Feb 2019 13:54:51 +0300
Subject: [PATCH 8/8] Update packages/jest-leak-detector/src/index.ts

Co-Authored-By: r3nya <r3nya@ya.ru>
---
 packages/jest-leak-detector/src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/jest-leak-detector/src/index.ts b/packages/jest-leak-detector/src/index.ts
index feff4b1e4f7b..007b907fad6e 100644
--- a/packages/jest-leak-detector/src/index.ts
+++ b/packages/jest-leak-detector/src/index.ts
@@ -12,7 +12,7 @@ import prettyFormat from 'pretty-format';
 export default class {
   private _isReferenceBeingHeld: boolean;
 
-  constructor(value: any) {
+  constructor(value: unknown) {
     if (this._isPrimitive(value)) {
       throw new TypeError(
         [