Supabase边缘函数通过Firebase推送通知遇TypeError求助

错误原因 #

这个TypeError: Right-hand side of 'instanceof' is not an object错误，源于Firebase Admin SDK依赖的jsonwebtoken库在Deno环境（Supabase边缘函数基于Deno）中缺少适配，导致内部类型检查逻辑失效。

修复步骤 #

1. 导入适配Deno的Firebase Admin包
   修改Firebase Admin的导入链接，添加?target=deno参数，让esm.sh提供针对Deno环境编译的版本：

   import { initializeApp, cert } from "https://esm.sh/firebase-admin@11.11.0?target=deno"
   import { getMessaging } from "https://esm.sh/firebase-admin@11.11.0/messaging?target=deno"
   

2. 确保私钥格式合法
   从Firebase下载的服务账号私钥包含换行符，直接写入代码时需保证格式正确，推荐用模板字符串保留换行：

   privateKey: `-----BEGIN PRIVATE KEY-----
   your-private-key-full-content-here
   -----END PRIVATE KEY-----`,
   

3. 等待异步操作完成
   原代码中sendToDevice是异步操作，但函数直接返回Response，会导致推送逻辑可能未执行完毕就终止。需用await等待异步操作完成：

修改后的完整代码 #

import { serve } from "https://deno.land/std@0.168.0/http/server.ts"
import { initializeApp, cert } from "https://esm.sh/firebase-admin@11.11.0?target=deno"
import { getMessaging } from "https://esm.sh/firebase-admin@11.11.0/messaging?target=deno"

const serviceAccount = cert({
  projectId: "your-project-id",
  privateKey: `-----BEGIN PRIVATE KEY-----
  your-private-key-content
  -----END PRIVATE KEY-----`,
  clientEmail: "your-service-account-email",
})

const app = initializeApp({
  credential: serviceAccount
});

const TEST_FCM_TOKEN = "your-test-fcm-token"

export interface momentNotification {
  data: {
    title: string,
    message: string,
  }
}

serve(async (req) => {
  const { name } = await req.json()
  const data = {
    message: `Hello ${name}!`,
  }

  const defaultMessaging = getMessaging(app);

  try {
    const response = await defaultMessaging.sendToDevice(TEST_FCM_TOKEN, {
      notification: {
        title: 'title',
        body: 'description'
      },
    })
    console.log("Successfully sent message:", response);
  } catch (error) {
    console.log("Error sending message:", error);
  }

  return new Response(
    JSON.stringify(data),
    { headers: { "Content-Type": "application/json" } },
  )
})

验证方式 #

重新执行npx supabase functions serve启动本地服务，调用函数后查看日志，确认推送通知是否正常发送。

内容的提问来源于stack exchange，提问作者Adam O'Neill