chore: use Maps rather than objects as cache holders (#9902)

jestjs · Apr 28, 2020 · b4228da · b4228da
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -24,6 +24,7 @@
 - `[jest-resolve]` Pass custom cached `realpath` function to `resolve` ([#9873](https://github.com/facebook/jest/pull/9873))
 - `[jest-runtime]` Add `teardown` method to clear any caches when tests complete ([#9906](https://github.com/facebook/jest/pull/9906))
 - `[jest-runtime]` Do not pass files required internally through transformation when loading them ([#9900](https://github.com/facebook/jest/pull/9900))
+- `[jest-runtime]` Use `Map`s instead of object literals as cache holders ([#9901](https://github.com/facebook/jest/pull/9901))
 
 ## 25.4.0
 

diff --git a/packages/jest-resolve/src/index.ts b/packages/jest-resolve/src/index.ts
@@ -28,6 +28,7 @@ type FindNodeModuleConfig = {
   throwIfNotFound?: boolean;
 };
 
+// TODO: replace with a Map in Jest 26
 type BooleanObject = Record<string, boolean>;
 
 namespace Resolver {