Function createDynamicModule

lib/internal/modules/esm/create_dynamic_module.js:54–98

(imports, exports, url = '', evaluate)

 * @returns {object}
 */
const createDynamicModule = (imports, exports, url = '', evaluate) => {
  debug('creating ESM facade for %s with exports: %j', url, exports);
  const source = `
${ArrayPrototypeJoin(ArrayPrototypeMap(imports, createImport), '\n')}
${ArrayPrototypeJoin(ArrayPrototypeMap(exports, createExport), '\n')}
import.meta.done();
`;
  const {
    registerModule, compileSourceTextModule, SourceTextModuleTypes: { kFacade },
  } = require('internal/modules/esm/utils');
  const m = compileSourceTextModule(`${url}`, source, kFacade);

  const readyfns = new SafeSet();
  /** @type {DynamicModuleReflect} */
  const reflect = {
    exports: { __proto__: null },
    onReady: (cb) => { readyfns.add(cb); },
  };

  if (imports.length) {
    reflect.imports = { __proto__: null };
  }
  registerModule(m, {
    __proto__: null,
    initializeImportMeta: (meta, wrap) => {
      meta.exports = reflect.exports;
      if (reflect.imports) {
        meta.imports = reflect.imports;
      }
      meta.done = () => {
        evaluate(reflect);
        reflect.onReady = (cb) => cb(reflect);
        for (const fn of readyfns) {
          readyfns.delete(fn);
          fn(reflect);
        }
      };
    },
  });

  return {
    module: m,
    reflect,
  };
};

module.exports = createDynamicModule;