Option Shims

tsdown --shims

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

console.log(__dirname)
console.log(__filename)

import { fileURLToPath } from 'node:url'
import { dirname } from 'node:path'

const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

console.log(__dirname)
console.log(__filename)

const mod = require('some-module')

import { createRequire } from 'node:module'
const require = createRequire(import.meta.url)

const mod = require('some-module')

console.log(import.meta.url)
console.log(import.meta.dirname)

const import_meta = {
  url: require('url').pathToFileURL(__filename).toString(),
  dirname: __dirname,
  filename: __filename
}

console.log(import_meta.url)
console.log(import_meta.dirname)

export default defineConfig({
  entry: ['src/cli.ts'],
  format: ['esm'],
  platform: 'node',
  shims: true,  // Add __dirname, __filename
})

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
  platform: 'node',
  shims: true,  // ESM gets __dirname/__filename
                // CJS gets import.meta.* (automatic)
})

export default defineConfig({
  entry: ['src/server.ts'],
  format: ['esm'],
  platform: 'node',
  shims: true,
  deps: {
    neverBundle: [/.*/],  // External all deps
  },
})

// Source code
import { readFileSync } from 'fs'
import { join } from 'path'

// Read file relative to current module
const content = readFileSync(join(__dirname, 'data.json'), 'utf-8')

// tsdown config
export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm'],
  shims: true,  // Enables __dirname
})

// Added to output when shims enabled
import { fileURLToPath } from 'node:url'
import { dirname } from 'node:path'

const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

export default defineConfig({
  platform: 'node',
  format: ['esm'],
  shims: true,  // Recommended for Node.js
})

export default defineConfig({
  platform: 'browser',
  format: ['esm'],
  shims: false,  // Not needed for browser
})

export default defineConfig({
  platform: 'neutral',
  format: ['esm'],
  shims: false,  // Avoid platform-specific code
})

# Enable shims
tsdown --shims

# ESM with shims for Node.js
tsdown --format esm --platform node --shims

# Dual format with shims
tsdown --format esm --format cjs --shims

export default defineConfig({
  shims: true,
})

export default defineConfig({
  platform: 'node',  // Ensure Node.js platform
})

export default defineConfig({
  format: ['cjs'],  // Shims added automatically
})