// code is from https://github.com/angular/angular/blob/9aa94eb0e304e158e26e0d314e1d56f9f10693f9/packages/core/schematics/utils/load_esm.ts

/**
 * This uses a dynamic import to load a module which may be ESM.
 * CommonJS code can load ESM code via a dynamic import. Unfortunately, TypeScript
 * will currently, unconditionally downlevel dynamic import into a require call.
 * require calls cannot load ESM code and will result in a runtime error. To workaround
 * this, a Function constructor is used to prevent TypeScript from changing the dynamic import.
 * Once TypeScript provides support for keeping the dynamic import this workaround can
 * be dropped.
 * This is only intended to be used with Angular framework packages.
 *
 * @param modulePath The path of the module to load.
 * @returns A Promise that resolves to the dynamically imported module.
 */

export async function loadEsmModule<T>(modulePath: string | URL): Promise<T> {
  const namespaceObject = await new Function(
    "modulePath",
    `return import(modulePath);`,
  )(modulePath);

  // If it is not ESM then the values needed will be stored in the `default` property.
  // TODO_ESM: This can be removed once `@angular/*` packages are ESM only.
  if (namespaceObject.default) {
    return namespaceObject.default;
  } else {
    return namespaceObject;
  }
}