Node.js - SyntaxError: Unexpected token * when import express

问题

node: v10.16.3
npm: 6.12.0

I got a error when I import express in node. I'm using this code https://github.com/angular-university/rxjs-course, look at server/server.ts.

I run server.ts with

$ ts-node ./server/server.ts

The related code is:

import * as express from 'express';

The error is:

import * as express from 'express';
       ^

SyntaxError: Unexpected token *
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Module.m._compile (/usr/local/lib/node_modules/ts-node/src/index.ts:493:23)
    at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Object.require.extensions.(anonymous function) [as .ts] (/usr/local/lib/node_modules/ts-node/src/index.ts:496:12)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at Object.<anonymous> (/usr/local/lib/node_modules/ts-node/src/bin.ts:158:12)
    at Module._compile (internal/modules/cjs/loader.js:778:30)

I already tried to change the code with:

import express from 'express';

回答1:

I've solved using @ktad's suggestion:

I added "target": "es2017", in server.tsconfig.json.

Here my full server.tsconfig.json:

{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es2017",
    "lib": ["es2017"]
  }
}

来源：https://stackoverflow.com/questions/58463231/node-js-syntaxerror-unexpected-token-when-import-express

标签

node.js

typescript

express

rxjs

ts-node