Installing dependencies.

node_modules/@jest/source-map/build/index.d.ts

@@ -0,0 +1,16 @@
+/**
+ * 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 callsites = require('callsites');
+
+export declare function getCallsite(
+  level: number,
+  sourceMaps?: SourceMapRegistry | null,
+): callsites.CallSite;
+
+export declare type SourceMapRegistry = Map<string, string>;
+
+export {};