diff --git a/assets/cjs_shims.js b/assets/cjs_shims.js
index 425493c6..a2056370 100644
--- a/assets/cjs_shims.js
+++ b/assets/cjs_shims.js
@@ -1,5 +1,7 @@
+// Shim globals in cjs bundle
+
 export const importMetaUrlShim =
   typeof document === 'undefined'
-    ? new (require('u' + 'rl').URL)('file:' + __filename).href
+    ? new URL('file:' + __filename).href
     : (document.currentScript && document.currentScript.src) ||
       new URL('main.js', document.baseURI).href
diff --git a/assets/esm_shims.js b/assets/esm_shims.js
new file mode 100644
index 00000000..6749c80c
--- /dev/null
+++ b/assets/esm_shims.js
@@ -0,0 +1,8 @@
+// Shim globals in esm bundle
+import { fileURLToPath } from 'url'
+import path from 'path'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
+export { __dirname, __filename }
diff --git a/src/esbuild/index.ts b/src/esbuild/index.ts
index 5f327e84..5edddb9a 100644
--- a/src/esbuild/index.ts
+++ b/src/esbuild/index.ts
@@ -172,6 +172,7 @@ export async function runEsbuild(
       },
       inject: [
         format === 'cjs' ? path.join(__dirname, '../assets/cjs_shims.js') : '',
+        format === 'esm' ? path.join(__dirname, '../assets/esm_shims.js') : '',
         ...(options.inject || []),
       ].filter(Boolean),
       outdir:
diff --git a/test/index.test.ts b/test/index.test.ts
index f62f36f8..56dbc924 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -517,6 +517,21 @@ test(`transform import.meta.url in cjs format`, async (t) => {
   t.snapshot(await getFileContent('dist/input.js'))
 })
 
+test(`transform __dirname, __filename in esm format`, async (t) => {
+  const { getFileContent } = await run(
+    t.title,
+    {
+      'input.ts': `export const a = __dirname
+    export const b = __filename
+    `,
+    },
+    {
+      flags: ['--format', 'esm'],
+    }
+  )
+  t.snapshot(await getFileContent('dist/input.mjs'))
+})
+
 test('debounce promise', async (t) => {
   try {
     const equal = <T>(a: T, b: T) => {
diff --git a/test/snapshots/index.test.ts.md b/test/snapshots/index.test.ts.md
index 0ce30859..50f38890 100644
--- a/test/snapshots/index.test.ts.md
+++ b/test/snapshots/index.test.ts.md
@@ -393,7 +393,7 @@ Generated by [AVA](https://avajs.dev).
     });␊
     ␊
     // ../../../assets/cjs_shims.js␊
-    var importMetaUrlShim = typeof document === "undefined" ? new (require("url")).URL("file:" + __filename).href : document.currentScript && document.currentScript.src || new URL("main.js", document.baseURI).href;␊
+    var importMetaUrlShim = typeof document === "undefined" ? new URL("file:" + __filename).href : document.currentScript && document.currentScript.src || new URL("main.js", document.baseURI).href;␊
     ␊
     // input.ts␊
     var input_default = importMetaUrlShim;␊
@@ -401,6 +401,25 @@ Generated by [AVA](https://avajs.dev).
     0 && (module.exports = {});␊
     `
 
+## transform __dirname, __filename in esm format
+
+> Snapshot 1
+
+    `// ../../../assets/esm_shims.js␊
+    import { fileURLToPath } from "url";␊
+    import path from "path";␊
+    var __filename = fileURLToPath(import.meta.url);␊
+    var __dirname = path.dirname(__filename);␊
+    ␊
+    // input.ts␊
+    var a = __dirname;␊
+    var b = __filename;␊
+    export {␊
+      a,␊
+      b␊
+    };␊
+    `
+
 ## code splitting in cjs format
 
 > Snapshot 1
diff --git a/test/snapshots/index.test.ts.snap b/test/snapshots/index.test.ts.snap
index 58295ad3..e592c402 100644
Binary files a/test/snapshots/index.test.ts.snap and b/test/snapshots/index.test.ts.snap differ