fix: support hashbangs in commonjs modules (#47)

src/utils/get-rollup-configs.ts

@@ -13,6 +13,7 @@ import { esbuildTransform, esbuildMinify } from './rollup-plugins/esbuild.js';
 import { externalizeNodeBuiltins } from './rollup-plugins/externalize-node-builtins.js';
 import { patchBinary } from './rollup-plugins/patch-binary.js';
 import { resolveTypescriptMjsCts } from './rollup-plugins/resolve-typescript-mjs-cjs.js';
+import { stripHashbang } from './rollup-plugins/strip-hashbang.js';
 import { getExternalDependencies } from './parse-package-json/get-external-dependencies.js';
 
 type Options = {
@@ -92,6 +93,7 @@ const getConfig = {
 						})]
 						: []
 				),
+				stripHashbang(),
 				commonjs(),
 				json(),
 				esbuildTransform(esbuildConfig),

src/utils/rollup-plugins/strip-hashbang.ts

@@ -0,0 +1,21 @@
+import type { Plugin } from 'rollup';
+import MagicString from 'magic-string';
+
+const hashbangPattern = /^#!.*/;
+export const stripHashbang = (): Plugin => ({
+	name: 'strip-hashbang',
+
+	transform: (code) => {
+		if (!hashbangPattern.test(code)) {
+			return null;
+		}
+
+		const transformed = new MagicString(code);
+		transformed.replace(hashbangPattern, '');
+
+		return {
+			code: transformed.toString(),
+			map: transformed.generateMap({ hires: true }),
+		};
+	},
+});

tests/fixture-package/src/cjs.cjs

@@ -1,3 +1,5 @@
+#! /usr/bin/env node
+
 console.log('side effect');
 
 module.exports = function sayHello(name) {

tests/fixture-package/src/index.js

@@ -1,3 +1,5 @@
+#! /usr/bin/env node
+
 import value from './value.js';
 import { Component } from './component.tsx';
 import { sayHello } from './utils.js';

tests/fixture-package/src/value.js

@@ -1 +1,3 @@
+#! /usr/bin/env node
+
 export default 1234;