Add node modules and compiled JavaScript from main

node_modules/babel-jest/build/index.d.ts

@@ -0,0 +1,15 @@
+/**
+ * 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.
+ */
+import { TransformOptions } from '@babel/core';
+import type { Transformer } from '@jest/transform';
+interface BabelJestTransformer extends Transformer {
+    canInstrument: true;
+}
+declare const transformer: BabelJestTransformer & {
+    createTransformer: (options?: TransformOptions) => BabelJestTransformer;
+};
+export = transformer;