Fix.

node_modules/@jest/core/build/TestWatcher.js

@@ -0,0 +1,60 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+function _events() {
+  const data = require('events');
+
+  _events = function _events() {
+    return data;
+  };
+
+  return data;
+}
+
+function _defineProperty(obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+
+class TestWatcher extends _events().EventEmitter {
+  constructor({isWatchMode}) {
+    super();
+
+    _defineProperty(this, 'state', void 0);
+
+    _defineProperty(this, '_isWatchMode', void 0);
+
+    this.state = {
+      interrupted: false
+    };
+    this._isWatchMode = isWatchMode;
+  }
+
+  setState(state) {
+    Object.assign(this.state, state);
+    this.emit('change', this.state);
+  }
+
+  isInterrupted() {
+    return this.state.interrupted;
+  }
+
+  isWatchMode() {
+    return this._isWatchMode;
+  }
+}
+
+exports.default = TestWatcher;