createImportMetaResolver() — vite Function Reference

Source Code

packages/vite/src/module-runner/importMetaResolver.ts lines 41–88

export function createImportMetaResolver(): ImportMetaResolver | undefined {
  if (isHookRegistered) {
    return importMetaResolveWithCustomHook
  }

  let module: typeof import('node:module') | undefined
  try {
    module =
      typeof process !== 'undefined'
        ? process.getBuiltinModule('node:module').Module
        : undefined
  } catch {
    return
  }
  // `module.Module` may be `undefined` when `node:module` is mocked
  if (!module) {
    return
  }

  // Use registerHooks if available as it's more performant
  // eslint-disable-next-line n/no-unsupported-features/node-builtins -- we check the existence
  if (module.registerHooks) {
    // eslint-disable-next-line n/no-unsupported-features/node-builtins -- we checked the existence
    module.registerHooks({ resolve: customizationHookResolve })
    isHookRegistered = true
    return importMetaResolveWithCustomHook
  }

  // eslint-disable-next-line n/no-unsupported-features/node-builtins -- we check the existence
  if (!module.register) {
    return
  }

  try {
    const hookModuleContent = `data:text/javascript,${encodeURI(customizationHooksModule)}`
    // eslint-disable-next-line n/no-unsupported-features/node-builtins -- we checked the existence
    module.register(hookModuleContent)
  } catch (e) {
    // For `--experimental-network-imports` flag that exists in Node before v22
    if ('code' in e && e.code === 'ERR_NETWORK_IMPORT_DISALLOWED') {
      return
    }
    throw e
  }

  isHookRegistered = true
  return importMetaResolveWithCustomHook
}