Function isValidNodeImport

packages/vitest/src/node/resolver.ts:131–167

(id: string)

// The code from https://github.com/unjs/mlly/blob/c5bcca0cda175921344fd6de1bc0c499e73e5dac/src/syntax.ts#L51-L98
async function isValidNodeImport(id: string) {
  // clean url to strip off `?v=...` query etc.
  // node can natively import files with query params, so externalizing them is safe.
  id = cleanUrl(id)

  const extension = extname(id)

  if (BUILTIN_EXTENSIONS.has(extension)) {
    return true
  }

  if (extension !== '.js') {
    return false
  }

  id = id.replace('file:///', '')

  const package_ = findNearestPackageData(dirname(id))

  if (package_.type === 'module') {
    return true
  }

  if (/\.(?:\w+-)?esm?(?:-\w+)?\.js$|\/esm?\//.test(id)) {
    return false
  }

  try {
    await esModuleLexer.init
    const code = await fsp.readFile(id, 'utf8')
    const [, , , hasModuleSyntax] = esModuleLexer.parse(code)
    return !hasModuleSyntax
  }
  catch {
    return false
  }
}

export async function shouldExternalize(
  id: string,