jest snapshot - TS migration

packages/jest-snapshot/dts/natural-compare.d.ts

@@ -1,3 +1,4 @@
+// TODO Replace with @types/natural-compare when it is merged https://github.com/DefinitelyTyped/DefinitelyTyped/pull/33084
 declare module 'natural-compare' {
   const NaturalCompare: (a: string, b: string) => number;
   export default NaturalCompare;

packages/jest-snapshot/package.json

@@ -21,6 +21,9 @@
     "pretty-format": "^24.0.0",
     "semver": "^5.5.0"
   },
+  "peerDependencies": {
+    "jest-haste-map": "^24.0.0"
+  },
   "devDependencies": {
     "@types/mkdirp": "^0.5.2",
     "@types/prettier": "^1.16.1",

packages/jest-snapshot/src/index.ts

@@ -8,7 +8,7 @@
 
 import fs from 'fs';
 import {Config, MatcherState} from '@jest/types';
-import {FS as HasteFS} from 'jest-haste-map'; // eslint-disable-line import/no-extraneous-dependencies
+import {FS as HasteFS} from 'jest-haste-map';
 
 import diff from 'jest-diff';
 import {EXPECTED_COLOR, matcherHint, RECEIVED_COLOR} from 'jest-matcher-utils';

packages/jest-snapshot/src/snapshot_resolver.ts

@@ -20,8 +20,7 @@ export const buildSnapshotResolver = (
   if (!cache.has(key)) {
     cache.set(key, createSnapshotResolver(config.snapshotResolver));
   }
-  // @ts-ignore
-  return cache.get(key);
+  return cache.get(key)!;
 };
 
 function createSnapshotResolver(

packages/jest-snapshot/src/types.ts

@@ -1,4 +1,10 @@
-// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+/**
+ * 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 {Config} from '@jest/types';