问题描述
我有一台Node(14.3.0)服务器,通过添加以下行在我的package.json中启用了ES6模块导入:
package.json:
"type": "module",
根据此处的firebase-admin文档:https://firebase.google.com/docs/admin/setup/#node.js
如果您使用的是ES2015,则可以导入模块:
从“ firebase-admin”以管理员身份导入*;
使用import * as admin from 'firebase-admin';
时出现以下错误:
凭据:admin.credential.applicationDefault(),
TypeError:无法读取未定义的属性“ applicationDefault”
似乎firebase-admin
的导入不正确-我尝试删除package.json中的"type": "module"
行,并使用require导入firebase-admin:
const admin = require(firebase-admin)
它有效,所以我的问题是-是否可以使用ES6在节点中导入firebase-admin
,如果可以,怎么办?
下面是一个完整的,最小的复制品:
server.js
import express from 'express';
import * as admin from 'firebase-admin';
const app = express();
const PORT = process.env.PORT || 5000;
app.use(express.json());
admin.initializeApp({
credential: admin.credential.applicationDefault(),databaseURL: process.env.FIREBASE_DB_URL,});
app.listen(PORT,() => console.log(`listening on ${PORT}`));
export default app;
package.json
{
"name": "server","version": "1.0.0","main": "index.js","license": "MIT","dependencies": {
"express": "^4.17.1","firebase-admin": "^9.2.0",},"type": "module","scripts": {
"dev": "node server.js"
},"engines": {
"node": "14.x"
}
}
注意:在运行服务器之前,请确保在您的Shell(Mac / Linux)中执行此操作:
export GOOGLE_APPLICATION_CREDENTIALS="/your/path/to/service-account-file.json"
解决方法
我在firebase-admin-node
github上问了这个问题。显然,他们尚未对Node 14进行导入测试。答案很简单:
import admin from 'firebase-admin'
您可以在此处查看说明:
https://github.com/firebase/firebase-admin-node/issues/1061#event-3868300300
,像这样使用它:
$table->bigInteger('country_id')->unsigned()->nullable();
$table->foreign('country_id')->references('id')
->on('users')->onDelete('cascade');
$table->bigInteger('city_id')->unsigned()->nullable();
$table->foreign('city_id')->references('id')
->on('users')->onDelete('cascade');
$table->string('autreh')->nullable();
$table->bigInteger('state_id')->unsigned()->nullable();
$table->foreign('state_id')->references('id')
->on('users')->onDelete('cascade');
这样,您将可以使用这些功能。