Add getCacheFilePath to HasteMap

Author: rubennorte

CHANGELOG.md

@@ -14,6 +14,7 @@
 - `[jest-runtime]` Pass the normalized configuration to script transformers ([#7148](https://github.com/facebook/jest/pull/7148))
 - `[jest-runtime]` If `require` fails without a file extension, print all files that match with one ([#7160](https://github.com/facebook/jest/pull/7160))
 - `[jest-haste-map]` Make `ignorePattern` optional ([#7166](https://github.com/facebook/jest/pull/7166))
+- `[jest-haste-map]` Add `getCacheFilePath` to get the path to the cache file for a `HasteMap` instance ([#7217](https://github.com/facebook/jest/pull/7217))
 - `[jest-runtime]` Remove `cacheDirectory` from `ignorePattern` for `HasteMap` if not necessary ([#7166](https://github.com/facebook/jest/pull/7166))
 - `[jest-validate]` Add syntax to validate multiple permitted types ([#7207](https://github.com/facebook/jest/pull/7207))
 

packages/jest-haste-map/src/index.js

@@ -290,6 +290,10 @@ class HasteMap extends EventEmitter {
     );
   }
 
+  getCacheFilePath(): string {
+    return this._cachePath;
+  }
+
   build(): Promise<HasteMapObject> {
     if (!this._buildPromise) {
       this._buildPromise = this._buildFileMap()