[jest-resolve] cache current directory path (#8412)

Author: Connormiha

CHANGELOG.md

@@ -40,6 +40,7 @@
 
 - `[jest-runtime]` Fix module registry memory leak ([#8282](https://github.com/facebook/jest/pull/8282))
 - `[jest-resolve]` optimize resolve module path ([#8388](https://github.com/facebook/jest/pull/8388))
+- `[jest-resolve]` cache current directory ([#8412](https://github.com/facebook/jest/pull/8412))
 
 ## 24.7.1
 

packages/jest-resolve/src/defaultResolver.ts

@@ -188,6 +188,7 @@ function isDirectory(dir: Config.Path): boolean {
  return statSyncCached(dir) === IPathType.DIRECTORY;
 }
 
+const CURRENT_DIRECTORY = path.resolve('.');
 function isCurrentDirectory(testPath: Config.Path): boolean {
- return path.resolve('.') === path.resolve(testPath);
+ return CURRENT_DIRECTORY === path.resolve(testPath);
 }