test: remove moduleNameMapper

jest.config.js

@@ -1,20 +1,3 @@
-// These packages under the @babel namespace aren't in this monorepo.
-const externalBabelPackages = [
-  "plugin-syntax-async-generators",
-  "plugin-syntax-bigint",
-  "plugin-syntax-dynamic-import",
-  "plugin-syntax-json-strings",
-  "plugin-syntax-nullish-coalescing-operator",
-  "plugin-syntax-object-rest-spread",
-  "plugin-syntax-optional-catch-binding",
-  "plugin-syntax-optional-chaining",
-  "plugin-syntax-export-namespace-from",
-];
-
-// prettier-ignore
-const monorepoPackagePattern =
-  `^@babel/(?!eslint-)(?!${externalBabelPackages.join("|")})([a-zA-Z0-9_-]+)$`;
-
 module.exports = {
   collectCoverageFrom: [
     "packages/*/src/**/*.mjs",
@@ -60,8 +43,8 @@ module.exports = {
     "/test/__data__/",
     "<rootDir>/build/",
   ],
-  moduleNameMapper: {
-    [monorepoPackagePattern]: "<rootDir>/packages/babel-$1/",
-    "^@babel/eslint-([a-zA-Z0-9_-]+)$": "<rootDir>/eslint/babel-eslint-$1/",
-  },
+  // We don't need module name mappers here as depedencies of workspace
+  // package should be declared explicitly in the package.json
+  // Yarn will generate correct file links so that Jest can resolve correctly
+  moduleNameMapper: null,
 };