fix: resolve module field before main field

src/cli-main.ts

@@ -77,6 +77,9 @@ export async function main(options: Options = {}) {
     )
     .option('--pure <express>', 'Mark specific expressions as pure')
     .option('--metafile', 'Emit esbuild metafile (a JSON file)')
+    .option('--platform <platform>', 'Target platform', {
+      default: 'node',
+    })
     .action(async (files: string[], flags) => {
       const { build } = await import('.')
       Object.assign(options, {

src/index.ts

@@ -99,19 +99,25 @@ export async function runEsbuild(
       ? options.splitting
       : format === 'esm'
 
+  const platform = options.platform || 'node'
+
   try {
     result = await esbuild({
       entryPoints: options.entryPoints,
       format: format === 'cjs' && splitting ? 'esm' : format,
       bundle: typeof options.bundle === 'undefined' ? true : options.bundle,
-      platform: 'node',
+      platform,
       globalName: options.globalName,
       jsxFactory: options.jsxFactory,
       jsxFragment: options.jsxFragment,
       sourcemap: options.sourcemap,
       target: options.target === 'es5' ? 'es2016' : options.target,
       footer: options.footer,
       banner: options.banner,
+      mainFields:
+        platform === 'node'
+          ? ['module', 'main']
+          : ['browser', 'module', 'main'],
       plugins: [
         {
           name: 'modify-options',

src/options.ts

@@ -96,4 +96,9 @@ export type Options = {
   metafile?: boolean
   footer?: BuildOptions['footer']
   banner?: BuildOptions['banner']
+  /**
+   * Target platform
+   * @default `node`
+   */
+  platform?: 'node' | 'browser'
 }