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/src/__tests__/__snapshots__/index.test.ts.snap b/packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.ts.snap
new file mode 100644
index 000000000000..ac60d2bb2d8c
--- /dev/null
+++ b/packages/jest-leak-detector/src/__tests__/__snapshots__/index.test.ts.snap
@@ -0,0 +1,17 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`complains if the value is a primitive 1`] = `"Primitives cannot leak memory. You passed a undefined: <undefined>"`;
+
+exports[`complains if the value is a primitive 2`] = `"Primitives cannot leak memory. You passed a object: <null>"`;
+
+exports[`complains if the value is a primitive 3`] = `"Primitives cannot leak memory. You passed a boolean: <false>"`;
+
+exports[`complains if the value is a primitive 4`] = `"Primitives cannot leak memory. You passed a number: <42>"`;
+
+exports[`complains if the value is a primitive 5`] = `"Primitives cannot leak memory. You passed a string: <\\"foo\\">"`;
+
+exports[`complains if the value is a primitive 6`] = `"Primitives cannot leak memory. You passed a symbol: <Symbol()>"`;
+
+exports[`complains if the value is a primitive 7`] = `"Primitives cannot leak memory. You passed a symbol: <Symbol(foo)>"`;
+
+exports[`complains if the value is a primitive 8`] = `"Primitives cannot leak memory. You passed a number: <NaN>"`;