Object rest spread transform

Transform rest properties for object destructuring assignment and spread properties for object literals

Example

// Rest properties
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 }

Try in REPL

Installation

npm install --save-dev babel-plugin-transform-object-rest-spread

Usage

.babelrc

{
  "plugins": ["transform-object-rest-spread"]
}

Options

This plugin will use babel’s extends helper, which will polyfill Object.assign by default.

  • useBuiltIns - Do not use Babel’s helper’s and just transform to use the built-in method (Disabled by default).
{
  "plugins": [
    ["transform-object-rest-spread", { "useBuiltIns": true }]
  ]
}

// source
z = { x, ...y };
// compiled
z = Object.assign({ x }, y);

Via CLI

babel --plugins transform-object-rest-spread script.js

Via Node API

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

References