无法使babel版本7@babel/register工作

Question

我正在尝试babel@7的@babel/register，但似乎无法使其工作。我的包.json如下：

{
"name": "trying-out-babel-register-v7",
"version": "1.0.0",
"engines": {
"node": "~6.0.0"
},
"license": "MIT",
"dependencies": {
"@babel/core": "^7.2.0",
"@babel/register": "^7.0.0"
},
"devDependencies": {
"@babel/preset-env": "^7.2.0"
},
"scripts": {
"start": "node index.js"
}
}

需要('@babel/register'(的es6文件是：

require('@babel/register')({
presets: [
[
"@babel/env",
{
module: false,
targets: { "node": process.versions.node },
useBuiltIns: "usage"
}
]
]
});
const f = () =>{ console.log('arrow function work')}
f()
const a = {'a': 'a'};
const b = {
'b':'b',
...a
};
console.log(b)
class A {
constructor() {
console.log('hello class')
}
}
const k = new A()

注意，我特意使用nodeversion6来检查babel是否真的可以传输我的es6脚本。

我得到：

$ nvm use 6
Now using node v6.9.1
$ npm run start
> trying-out-babel-register-v7@1.0.0 start /Users/apollotang/Desktop/trying-out-babel-register-v7
> node index.js
/Users/apollotang/Desktop/trying-out-babel-register-v7/index.js:21
...a
^^^
SyntaxError: Unexpected token ...
at Object.exports.runInThisContext (vm.js:76:16)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
at startup (bootstrap_node.js:149:9)
at bootstrap_node.js:509:3
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! trying-out-babel-register-v7@1.0.0 start: `node index.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the trying-out-babel-register-v7@1.0.0 start script 'node index.js'.

回购链接：https://github.com/ApolloTang/trying-out-babel-register-v7

Answer 1

我已经弄明白了：由于某些原因，要传输的代码必须在所需的文件中(见下面的注释(：

require('@babel/register')({
presets: [
[
"@babel/env",
{
// module: false,      // <--- typo, not module
modules: "commonjs",   // <--- must transpile to commonjs module
targets: { "node": process.versions.node },
useBuiltIns: "usage"   // <--- not sure if this work
}
]
]
});
const f = () =>{ console.log('arrow function work')}
f()
/*
* does not work here, but works in the
* required file script-1.js
*
* const a = {'a': 'a'};
*
* const b = {
*   'b':'b',
*   ...a
* };
* console.log(b)
*/
class A {
constructor() {
console.log('hello class')
}
}
const k = new A()
// import someScript from  './script-1.js'; // <-- import does not work here but will work in ./script-1.js
require( './script-1.js')

我还将工作代码包含在repo中，链接：https://github.com/ApolloTang/trying-out-babel-register-v7/tree/solved