Object spread not working in Node 7.5

// Rest properties
require("babel-core").transform("code", {
  plugins: ["transform-object-rest-spread"]
});

let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
console.log(x); // 1
console.log(y); // 2
console.log(z); // { a: 3, b: 4 }

// Spread properties
let n = { x, y, ...z };
console.log(n); // { x: 1, y: 2, a: 3, b: 4 }

I am trying the above example from http://babeljs.io/docs/plugins/transform-object-rest-spread/ and it's not working.

let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
            ^^^
SyntaxError: Unexpected token ...
    at Object.exports.runInThisContext (vm.js:73:16)
    at Module._compile (module.js:543:28)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:418:7)
    at startup (bootstrap_node.js:139:9)
    at bootstrap_node.js:533:3

If I run it with babel-node then it works fine. Any idea why?

Solution

require("babel-core").transform("code", {
  plugins: ["transform-object-rest-spread"]
});

This is the Node API to transform code given as the first argument of the .transform() function. You would need to replace "code" with the actual code you want to transform. It won't touch any files. You don't do anything with the returned code, but you try to run the rest of the file regularly with Node, which doesn't support object spread operator yet. You would either have to execute the generated code, or write it to a file, which you can run with Node.

Here is an example how you would transpile your code with the Node API:

const babel = require('babel-core');
const fs = require('fs');

// Code that will be transpiled
const code = `let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
console.log(x); // 1
console.log(y); // 2
console.log(z); // { a: 3, b: 4 }

// Spread properties
let n = { x, y, ...z };
console.log(n); // { x: 1, y: 2, a: 3, b: 4 }`

const transformed = babel.transform(code, {
  plugins: ["transform-object-rest-spread"]
});

// Write transpiled code to output.js
fs.writeFileSync('output.js', transformed.code);

After running this, you have a file output.js which transformed the object spread. And then you could run it with:

node output.js