feat: allow to disable cjs/esm shims

src/cli-main.ts

@@ -84,6 +84,7 @@ export async function main(options: Options = {}) {
     })
     .option('--loader <ext=loader>', 'Specify the loader for a file extension')
     .option('--no-config', 'Disable config file')
+    .option('--no-shims', 'Disable cjs and esm shims')
     .action(async (files: string[], flags) => {
       const { build } = await import('.')
       Object.assign(options, {

src/esbuild/index.ts

@@ -87,6 +87,7 @@ export async function runEsbuild(
 
   const platform = options.platform || 'node'
   const loader = options.loader || {}
+  const injectShims = options.shims !== false
 
   const esbuildPlugins: Array<EsbuildPlugin | false | undefined> = [
     format === 'cjs' && nodeProtocolPlugin(),
@@ -155,7 +156,7 @@ export async function runEsbuild(
           : ['browser', 'module', 'main'],
       plugins: esbuildPlugins.filter(truthy),
       define: {
-        ...(format === 'cjs'
+        ...(format === 'cjs' && injectShims
           ? {
               'import.meta.url': 'importMetaUrlShim',
             }
@@ -171,8 +172,10 @@ export async function runEsbuild(
         }, {}),
       },
       inject: [
-        format === 'cjs' ? path.join(__dirname, '../assets/cjs_shims.js') : '',
-        format === 'esm' && platform === 'node'
+        format === 'cjs' && injectShims
+          ? path.join(__dirname, '../assets/cjs_shims.js')
+          : '',
+        format === 'esm' && injectShims && platform === 'node'
           ? path.join(__dirname, '../assets/esm_shims.js')
           : '',
         ...(options.inject || []),

src/options.ts

@@ -122,4 +122,9 @@ export type Options = {
    * Use a custom tsconfig
    */
   tsconfig?: string
+  /**
+   * CJS and ESM shims
+   * @default `true`
+   */
+  shims?: boolean
 }