Option Output Format

# Single format
tsdown --format esm

# Multiple formats
tsdown --format esm --format cjs

# Or comma-separated
tsdown --format esm,cjs

export default defineConfig({
  entry: ['src/index.ts'],
  format: 'esm',
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: {
    esm: {
      target: ['es2015'],
    },
    cjs: {
      target: ['node20'],
    },
  },
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
  dts: true,
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['iife'],
  globalName: 'MyLib',
  platform: 'browser',
  minify: true,
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['umd'],
  globalName: 'MyLib',
  platform: 'neutral',
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
  platform: 'node',
  dts: true,
  shims: true, // Add __dirname, __filename for CJS compat
})

export default defineConfig({
  entry: ['src/index.tsx'],
  format: ['esm', 'cjs'],
  deps: {
    neverBundle: ['react', 'react-dom'], // Don't bundle dependencies
  },
  dts: true,
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
  outExtensions: ({ format }) => ({
    js: format === 'esm' ? '.js' : '.cjs',
  }),
})