diff --git a/jest.config.mjs b/jest.config.mjs
index d6ff3a8..c724821 100644
--- a/jest.config.mjs
+++ b/jest.config.mjs
@@ -3,6 +3,6 @@ export default {
     preset: "ts-jest",
     testEnvironment: "node",
     moduleNameMapper: {
-        "(.+)\.js": "$1",
+        "(.+)\.js$": "$1",
     },
 };
diff --git a/tests/unit/fetcher/stream-wrappers/webpack.test.ts b/tests/unit/fetcher/stream-wrappers/webpack.test.ts
index 903246b..ccd07b0 100644
--- a/tests/unit/fetcher/stream-wrappers/webpack.test.ts
+++ b/tests/unit/fetcher/stream-wrappers/webpack.test.ts
@@ -17,7 +17,11 @@ describe("test env compatibility", () => {
                         ],
                     },
                     resolve: {
-                        extensions: [".tsx", ".ts", ".js"],
+                        extensions: [".tsx", ".ts", ".jsx", ".js"],
+                        extensionAlias: {
+                            ".js": [".ts", ".js"],
+                            ".jsx": [".tsx", ".jsx"],
+                        },
                     },
                 },
                 (err, stats) => {