Requiring a ES Module into CJS environment

esmRequire.js

/**
 * @file import compiled ES modules as a workaround
 */

const esm = require('esm')
const fs = require('fs')
const Module = require('module')


// Node: bypass [ERR_REQUIRE_ESM]
const orig = Module._extensions['.js']
Module._extensions['.js'] = function (module, filename) {
  try {
    return orig(module, filename)
  } catch (e) {
    if (e.code === 'ERR_REQUIRE_ESM') {
      const content = fs.readFileSync(filename, 'utf8')
      module._compile(content, filename)
    }
  }
}

const _esmRequire = esm(module, {
  cjs: true,
  mode: 'all',
})

// don't pollute Module
Module._extensions['.js'] = orig


module.exports = function esmRequire(id) {
  return _esmRequire(id)
}

OI-wiki/gatsby-oi-wiki/commit/3f782b20263dbe820c1b6eb3baba2b0b53f1ceaf