diff --git a/.gitignore b/.gitignore
index 81ef253..bcda070 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,9 @@
 node_modules
 dist
-entry-asar/*.js*
-entry-asar/*.ts
+entry-asar/cjs/*.js*
+entry-asar/cjs/*.d.ts
+entry-asar/esm/*.?js*
+entry-asar/esm/*.d.?ts
 *.app
 test/fixtures/apps
 coverage
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..f1c7ab5
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,5 @@
+# npmignore overrides .gitignore for yarn pack
+# Only exclude source files, not built files
+entry-asar/**/*.mts
+entry-asar/**/*.ts  
+entry-asar/**/tsconfig.json
diff --git a/entry-asar/has-asar.ts b/entry-asar/cjs/has-asar.ts
similarity index 100%
rename from entry-asar/has-asar.ts
rename to entry-asar/cjs/has-asar.ts
diff --git a/entry-asar/no-asar.ts b/entry-asar/cjs/no-asar.ts
similarity index 100%
rename from entry-asar/no-asar.ts
rename to entry-asar/cjs/no-asar.ts
diff --git a/entry-asar/cjs/tsconfig.json b/entry-asar/cjs/tsconfig.json
new file mode 100644
index 0000000..ea4d52f
--- /dev/null
+++ b/entry-asar/cjs/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": ".",
+  },
+  "include": [
+    ".",
+    "../ambient.d.ts"
+  ],
+  "exclude": []
+}
diff --git a/entry-asar/esm/has-asar.mts b/entry-asar/esm/has-asar.mts
new file mode 100644
index 0000000..3bee10f
--- /dev/null
+++ b/entry-asar/esm/has-asar.mts
@@ -0,0 +1,28 @@
+import { app } from 'electron';
+import { createRequire } from 'node:module';
+import path from 'node:path';
+
+if (process.arch === 'arm64') {
+  await setPaths('arm64');
+} else {
+  await setPaths('x64');
+}
+
+async function setPaths(platform: string) {
+  // This should return the full path, ending in something like
+  // Notion.app/Contents/Resources/app.asar
+  const appPath = app.getAppPath();
+  const asarFile = `app-${platform}.asar`;
+
+  // Maybe we'll handle this in Electron one day
+  if (path.basename(appPath) === 'app.asar') {
+    const platformAppPath = path.join(path.dirname(appPath), asarFile);
+
+    // This is an undocumented API. It exists.
+    app.setAppPath(platformAppPath);
+  }
+
+  const require = createRequire(import.meta.url);
+  process._archPath = require.resolve(`../${asarFile}`);
+  await import(process._archPath);
+}
diff --git a/entry-asar/esm/no-asar.mts b/entry-asar/esm/no-asar.mts
new file mode 100644
index 0000000..72b28e7
--- /dev/null
+++ b/entry-asar/esm/no-asar.mts
@@ -0,0 +1,29 @@
+import { app } from 'electron';
+import { createRequire } from 'node:module';
+import path from 'node:path';
+
+if (process.arch === 'arm64') {
+  await setPaths('arm64');
+} else {
+  await setPaths('x64');
+}
+
+async function setPaths(platform: string) {
+  // This should return the full path, ending in something like
+  // Notion.app/Contents/Resources/app
+  const appPath = app.getAppPath();
+  const appFolder = `app-${platform}`;
+
+  // Maybe we'll handle this in Electron one day
+  if (path.basename(appPath) === 'app') {
+    const platformAppPath = path.join(path.dirname(appPath), appFolder);
+
+    // This is an undocumented private API. It exists.
+    app.setAppPath(platformAppPath);
+  }
+
+   const require = createRequire(import.meta.url);
+   process._archPath = require.resolve(`../${appFolder}`);
+
+   await import(process._archPath);
+}
diff --git a/entry-asar/esm/tsconfig.json b/entry-asar/esm/tsconfig.json
new file mode 100644
index 0000000..adf967d
--- /dev/null
+++ b/entry-asar/esm/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "module": "ESNext",
+    "target":"ESNext",
+    "outDir": ".",
+    "moduleResolution": "bundler"
+  },
+  "include": [
+    ".",
+    "../ambient.d.ts"
+  ],
+  "exclude": []
+}
diff --git a/package.json b/package.json
index f6a4688..5e5a976 100644
--- a/package.json
+++ b/package.json
@@ -19,8 +19,12 @@
   },
   "files": [
     "dist/*",
-    "entry-asar/*",
-    "!entry-asar/**/*.ts",
+    "entry-asar/**/*",
+    "!entry-asar/**/has-asar.ts",
+    "!entry-asar/**/no-asar.ts",
+    "!entry-asar/**/has-asar.mts",
+    "!entry-asar/**/no-asar.mts",
+    "!entry-asar/**/tsconfig.json",
     "README.md"
   ],
   "author": "Samuel Attard",
@@ -28,7 +32,7 @@
     "provenance": true
   },
   "scripts": {
-    "build": "tsc -p tsconfig.json && tsc -p tsconfig.entry-asar.json",
+    "build": "tsc -p tsconfig.json && tsc -p entry-asar/esm/tsconfig.json && tsc -p entry-asar/cjs/tsconfig.json",
     "build:docs": "npx typedoc",
     "lint": "prettier --check \"{src,entry-asar,test}/**/*.ts\" \"*.ts\"",
     "prettier:write": "prettier --write \"{src,entry-asar,test}/**/*.ts\" \"*.ts\"",
diff --git a/src/index.ts b/src/index.ts
index 8593496..4c0f6b6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -254,17 +254,30 @@ export const makeUniversalApp = async (opts: MakeUniversalOpts): Promise<void> =
 
         const entryAsar = path.resolve(tmpDir, 'entry-asar');
         await fs.promises.mkdir(entryAsar, { recursive: true });
-        await fs.promises.cp(
-          path.resolve(import.meta.dirname, '..', 'entry-asar', 'no-asar.js'),
-          path.resolve(entryAsar, 'index.js'),
-        );
+
         let pj = JSON.parse(
           await fs.promises.readFile(
             path.resolve(opts.x64AppPath, 'Contents', 'Resources', 'app', 'package.json'),
             'utf8',
           ),
         );
-        pj.main = 'index.js';
+
+        // Load a shim that redirects to the correct folder for the architecture.
+        // This needs to be a different file depending on if the app entrypoint is CommonJS or ESM.
+        if (pj.type === 'module' || pj.main.endsWith('.mjs')) {
+          await fs.promises.cp(
+            path.resolve(import.meta.dirname, '..', 'entry-asar', 'esm', 'no-asar.mjs'),
+            path.resolve(entryAsar, 'index.mjs'),
+          );
+          pj.main = 'index.mjs';
+        } else {
+          await fs.promises.cp(
+            path.resolve(import.meta.dirname, '..', 'entry-asar', 'cjs', 'no-asar.js'),
+            path.resolve(entryAsar, 'index.js'),
+          );
+          pj.main = 'index.js';
+        }
+
         await fs.promises.writeFile(
           path.resolve(entryAsar, 'package.json'),
           JSON.stringify(pj) + '\n',
@@ -337,10 +350,6 @@ export const makeUniversalApp = async (opts: MakeUniversalOpts): Promise<void> =
 
         const entryAsar = path.resolve(tmpDir, 'entry-asar');
         await fs.promises.mkdir(entryAsar, { recursive: true });
-        await fs.promises.cp(
-          path.resolve(import.meta.dirname, '..', 'entry-asar', 'has-asar.js'),
-          path.resolve(entryAsar, 'index.js'),
-        );
         let pj = JSON.parse(
           (
             await asar.extractFile(
@@ -349,7 +358,23 @@ export const makeUniversalApp = async (opts: MakeUniversalOpts): Promise<void> =
             )
           ).toString('utf8'),
         );
-        pj.main = 'index.js';
+
+        // Load a shim that redirects to the correct `app.asar` for the architecture.
+        // This needs to be a different file depending on if the app entrypoint is CommonJS or ESM.
+        if (pj.type === 'module' || pj.main.endsWith('.mjs')) {
+          await fs.promises.cp(
+            path.resolve(import.meta.dirname, '..', 'entry-asar', 'esm', 'has-asar.mjs'),
+            path.resolve(entryAsar, 'index.mjs'),
+          );
+          pj.main = 'index.mjs';
+        } else {
+          await fs.promises.cp(
+            path.resolve(import.meta.dirname, '..', 'entry-asar', 'cjs', 'has-asar.js'),
+            path.resolve(entryAsar, 'index.js'),
+          );
+          pj.main = 'index.js';
+        }
+
         await fs.promises.writeFile(
           path.resolve(entryAsar, 'package.json'),
           JSON.stringify(pj) + '\n',
diff --git a/tsconfig.entry-asar.json b/tsconfig.entry-asar.json
deleted file mode 100644
index 7f3e899..0000000
--- a/tsconfig.entry-asar.json
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  "compilerOptions": {
-    "module": "commonjs",
-    "target": "es2017",
-    "lib": [
-      "es2017"
-    ],
-    "sourceMap": true,
-    "strict": true,
-    "outDir": "entry-asar",
-    "types": [
-      "node",
-    ],
-    "allowSyntheticDefaultImports": true,
-    "moduleResolution": "node",
-    "esModuleInterop": true,
-    "declaration": false
-  },
-  "include": [
-    "entry-asar"
-  ],
-  "exclude": []
-}