Firebase Functions加载失败求助：代码库分析失败（语法/运行时错误）

报错信息 #

Failed to load function definition from source: FirebaseError: Functions codebase could not be analyzed successfully. It may have a syntax or runtime error

问题代码 #

import * as functions from 'firebase-functions';
import {onDocumentWritten} from "firebase-functions/lib/v2/providers/firestore";

export function nameUser = onDocumentWritten("/users/{userId}", (event) => {
functions.logger.info(`ID >> ${event.data?.after.data()}`, {structuredData: true});
})

错误原因分析 #

1. 导出语法错误：export function nameUser = ... 不符合JavaScript语法。onDocumentWritten返回的是函数实例，需用变量赋值方式导出，正确写法是export const，不能用function声明后直接赋值。
2. 箭头函数体未闭合：箭头函数用{}包裹代码块，但只打开了{却未添加对应的}，导致语法结构不完整。
3. import指向为误报：上述语法错误导致代码解析失败，解析器错误定位到import语句，实际问题出在后续函数定义部分。

修复后的代码 #

import * as functions from 'firebase-functions';
import {onDocumentWritten} from "firebase-functions/lib/v2/providers/firestore";

export const nameUser = onDocumentWritten("/users/{userId}", (event) => {
  functions.logger.info(`ID >> ${event.data?.after.data()}`, {structuredData: true});
});

内容的提问来源于stack exchange，提问作者MagicGanza