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https://stackoverflow.com/questions/51562162/no-metadata-for-user-was-found-using-typeorm

# 问题描述

问题来自一个 typeorm 的 dataSource 配置：

const dataSource = new DataSource({
  type: "mysql",
  host: MYSQL_HOST,
  port: Number(MYSQL_PROT),
  username: MYSQL_USER,
  password: MYSQL_PWD,
  database: MYSQL_DB,
  synchronize: process.env.NODE_ENV === "development",
  entities: ["src/entity/*.ts"],
});

开发环境正常，生产环境报错：

******\src\entity\user.ts:1
import { Entity, Column, PrimaryGeneratedColumn, CreateDateColumn, UpdateDateColumn, DeleteDateColumn } from 'typeorm';
^^^^^^
SyntaxError: Cannot use import statement outside a module
蜜汁调用了 ts 文件。
# 解决
entities 路径指向了未被编译的 ts 文件，顺带如果路径写错的话就会出现 "No metadata for User was found" 的报错。
__dirname 指向当前模块的路径。
改一下就好了：
const dataSource = new DataSource({
  type: "mysql",
  host: MYSQL_HOST,
  port: Number(MYSQL_PROT),
  username: MYSQL_USER,
  password: MYSQL_PWD,
  database: MYSQL_DB,
  synchronize: process.env.NODE_ENV === "development",
  entities: [__dirname + "/../entity/**/*.js", __dirname + "/../entity/**/*.ts"],
});
才发现自己原来根本不理解这个路径的意思 qwq