Build ESM to UMD

buildUmd.js

import { transformFile } from '@swc/core'
import { writeFile } from 'node:fs/promises'
import { resolve } from 'node:path'

/** @type {import('@swc/core').Options} */
const baseSwcOptions = {
  jsc: {
    target: 'es2022',
    parser: {
      syntax: 'ecmascript',
      jsx: false,
    },
  },
  module: {
    type: 'umd',
    strict: false,
    strictMode: true,
    lazy: false,
    noInterop: false,
  },
}

/**
 * Трансформация ESM сборки в UMD
 * @param {import('@swc/core').Options} extrnalSwcOptions
 * @param {string} inputFile - путь до `entry` файла с ESM-сборкой. По умолчанию: `lib/index.js`
 * @param {string} outputFile - `output`-путь для трансформированного файла. По умолчанию: `lib/index.umd.js`
 */
export const buildUmd = async (
  extrnalSwcOptions = {},
  inputFile = 'lib/index.js',
  outputFile = 'lib/index.umd.js'
) => {
  try {
    console.log('UMD Transform start')

    const fullInputFilePath = resolve(inputFile)
    const fullOutputFilePath = resolve(outputFile)
    const swcOptions = { ...baseSwcOptions, ...extrnalSwcOptions }

    const result = await transformFile(fullInputFilePath, swcOptions)
    await writeFile(fullOutputFilePath, result.code)

    console.log(`UMD File Transform success: ${fullOutputFilePath}`)
  } catch (error) {
    console.error('UMD Error transforming file:\n', error)
  }
}