Question

我已经用nodejs实现了简单的rest api，并通过typeorm连接到数据库。以下是我编写的一些代码片段：

import {
  Entity,
  PrimaryGeneratedColumn,
  Column,
  Unique,
  CreateDateColumn,
  UpdateDateColumn
} from "typeorm";
import { Length, IsNotEmpty } from "class-validator";
import bcrypt from "bcryptjs";

@Entity()
@Unique(["username"])
export class User {
  @PrimaryGeneratedColumn()
  public id: number;

  @Column()
  @Length(4, 20)
  username: string;
}

tsconfig.json

{
    "compilerOptions": {
        "experimentalDecorators": true,
        "module": "commonjs",
        "esModuleInterop": true,
        "target": "es6",
        "moduleResolution": "node",
        "sourceMap": true,
        "outDir": "dist",
        "emitDecoratorMetadata": true
    },
    "lib": [
        "es2015"
    ]
}

package.json

{
    "name": "node-with-ts",
    "version": "1.0.0",
    "description": "",
    "main": "dist/app.js",
    "scripts": {
        "start": "tsc && node dist/app.js",
        "test": "echo \"Error: no test specified\" && exit 1",
        "tsc": "tsc",
        "prod": "node ./dist/app.js",
        "build": "npm install && tsc -p .",
        "reset": "rm -rf node_modules/ && rm -rf dist/ && npm run build",
        "migration:run": "ts-node ./node_modules/typeorm/cli.js migration:run"
    },
    "author": "",
    "license": "ISC",
    "devDependencies": {
        "@types/express": "^4.16.1",
        "@types/node": "^12.7.5",
        "nodemon": "^1.19.2",
        "ts-node": "8.4.1",
        "tslint": "^5.12.1",
        "typescript": "^3.3.3"
    },
    "dependencies": {
        "@types/bcryptjs": "^2.4.2",
        "@types/body-parser": "^1.17.0",
        "@types/cors": "^2.8.4",
        "@types/helmet": "0.0.42",
        "@types/jsonwebtoken": "^8.3.0",
        "bcryptjs": "^2.4.3",
        "body-parser": "^1.18.1",
        "class-validator": "^0.9.1",
        "cors": "^2.8.5",
        "express": "4.17.1",
        "helmet": "^3.21.1",
        "jsonwebtoken": "^8.4.0",
        "reflect-metadata": "^0.1.13",
        "sqlite3": "^4.1.0",
        "ts-node-dev": "^1.0.0-pre.32",
        "typeorm": "^0.2.12"
    }
}

我粘贴了很多代码，因为我不知道出了什么问题。我正在尝试通过npm run start运行应用，并且抛出以下错误：

> tsc && node dist/app.js

    /Users/workspace/node_typescript_project/src/entity/User.ts:1
    (function (exports, require, module, __filename, __dirname) { import {
                                                                  ^^^^^^

    SyntaxError: Unexpected token import

尽管我可以构建项目并生成js代码，但在运行应用程序时会引发错误。

Answer 1

您的实体可能未在Typeorm配置文件中正确引用。

尝试查看它是否可以与以下ormconfig.js文件配合使用（请特别注意entities属性：

// ormconfig.js at root of project
const isDevelopment = process.env.NODE_ENV === 'development';
module.exports = {
  type: 'mysql',
  host: process.env.MYSQL_HOST,
  port: process.env.MYSQL_TCP_PORT,
  username: process.env.MYSQL_USER,
  password: process.env.MYSQL_PASSWORD,
  database: process.env.MYSQL_DATABASE,
  synchronize: isDevelopment,
  logging: isDevelopment,
  entities: [
    isDevelopment ? `src/**/*.entity.ts` : `dist/**/*.entity.js`,
  ],
  migrations: [`src/migration/**/*.ts`],
  subscribers: ['src/subscriber/**/*.ts'],
  cli: {
    entitiesDir: 'src/entity',
    migrationsDir: 'src/migration',
    subscribersDir: 'src/subscriber',
  },
};

通过此设置，我让ts节点直接处理我的Typescript源文件，并且仅在生产中才使用tsc进行构建。构建产品时，我需要引用dist文件夹中的.js文件。

Answer 2

我正在尝试复制问题，但无法复制。刚刚为上述代码创建了示例存储库。

https://github.com/pktippa/stackoverflow-questions/tree/master/58148222

Answer 3

尝试其他导入语法，例如：从“ bcryptjs”导入{bcrypt};

可以找到其他导入语法示例here。

Answer 4

Node.js不处理ES6语法（带有导入等）。为此，您必须将ES6代码转换为ES5，可以使用Babel => https://github.com/babel/example-node-server

如果您不想使用Babel，只需将import替换为require：

const bcrypt = require("bcryptjs");  // same as 'import * as bcrypt from "bcryptjs";'

从打字稿转译时，NodeJS导入出现问题

4 个答案: