Jest 找不到包中导入的模块 firebase-admin/storage

Question

我有一个包 admin-sdk 用于多个项目，依赖于 firebase-admin 并导出函数 export function storage(): admin.storage.Storage 以获取对云存储的引用。

这个包在一个 NestJS 应用程序中使用并且工作正常，但是当我使用 Jest 运行测试时，我得到模块未找到错误：

● Test suite failed to run

    Cannot find module 'firebase-admin/storage' from 'node_modules/admin-sdk/dist/firebase/storage.js'

    Require stack:
      node_modules/admin-sdk/dist/firebase/storage.js
      node_modules/admin-sdk/dist/firebase/index.js
      node_modules/admin-sdk/dist/index.js
      src/services/provocation/provocation.service.ts
      src/services/provocation/provocation.service.spec.ts

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:306:11)
      at Object.<anonymous> (node_modules/admin-sdk/dist/firebase/storage.js:4:19)

node_modules/admin-sdk/storage.ts

import {Bucket} from "@google-cloud/storage";
import {getStorage, Storage} from "firebase-admin/storage";

let _storage: Storage;

const _buckets: Record<string, Bucket> = {};

export function storage(): Storage {
    if (!_storage) {
        _storage = getStorage(); //admin.storage();
    }


    return _storage;
}

export function bucket(name?: string): Bucket {
    let id = name || "";

    if (!_buckets.hasOwnProperty(id)) {
        _buckets[id] = storage().bucket(name);
    }

    return _buckets[id];
}

两个库都依赖于同一版本的 firebase-admin，即 ^10.0.2。

那么为什么会出现这个错误，我该如何解决呢？

Answer 1

尝试在 jest.config.ts 上手动映射：

import { pathsToModuleNameMapper } from 'ts-jest/utils';
import { compilerOptions } from './tsconfig.json';

...
export default {
 ...
 moduleNameMapper: pathsToModuleNameMapper(
    {
      ...compilerOptions.paths,
      'firebase-admin/*': ['node_modules/firebase-admin/lib/*'],
    },
    {
      prefix: '<rootDir>',
    },
  ),
...
}