Function compileSourceTextModule

lib/internal/modules/esm/utils.js:337–379

* Compile a SourceTextModule for the built-in ESM loader. Register it for default * source map and import.meta and dynamic import() handling if cascadedLoader is provided. * @param {string} url URL of the module. * @param {string} source Source code of the module. * @param {string} type Type of

(url, source, type, context = kEmptyObject)

 * @returns {ModuleWrap}
 */
function compileSourceTextModule(url, source, type, context = kEmptyObject) {
  let hostDefinedOptions;
  switch (type) {
    case SourceTextModuleTypes.kFacade:
    case SourceTextModuleTypes.kInternal:
      hostDefinedOptions = undefined;
      break;
    case SourceTextModuleTypes.kEmbedder:
      hostDefinedOptions = embedder_module_hdo;
      break;
    case SourceTextModuleTypes.kUser:
      hostDefinedOptions = source_text_module_default_hdo;
      break;
    default:
      assert.fail(`Unknown SourceTextModule type: ${type}`);
  }

  const wrap = new ModuleWrap(url, undefined, source, 0, 0, hostDefinedOptions);

  if (type === SourceTextModuleTypes.kFacade) {
    return wrap;
  }

  const { isMain } = context;
  if (isMain) {
    wrap.isMain = true;
  }

  // Cache the source map for the module if present.
  if (wrap.sourceMapURL) {
    maybeCacheSourceMap(url, source, wrap, false, wrap.sourceURL, wrap.sourceMapURL);
  }

  if (type === SourceTextModuleTypes.kEmbedder) {
    // For embedder ESM, we also handle the linking and evaluation.
    const requests = wrap.getModuleRequests();
    const modules = requests.map(({ specifier }) => getBuiltinModuleWrapForEmbedder(specifier));
    wrap.link(modules);
    wrap.instantiate();
    wrap.evaluate(-1, false);
  }
  return wrap;
}

const kImportInImportedESM = Symbol('kImportInImportedESM');
const kImportInRequiredESM = Symbol('kImportInRequiredESM');