ES2015 spread transform

Compile ES2015 spread to ES5

Example

In

var a = ['a', 'b', 'c'];
var b = [...a, 'foo'];

var c = { foo: 'bar', baz: 42 };
var d = {...c, a: 2};

Out

var _extends = Object.assign || function (target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i];
    for (var key in source) {
      if (Object.prototype.hasOwnProperty.call(source, key)) {
        target[key] = source[key];
      }
    }
  }
  return target;
}

var a = [ 'a', 'b', 'c' ];
var b = [].concat(a, [ 'foo' ]);

var c = { foo: 'bar', baz: 42 };
var d = _extends({}, c, { a: 2 });

Installation

npm install --save-dev babel-plugin-transform-es2015-spread

Usage

.babelrc

Without options:

{
  "plugins": ["transform-es2015-spread"]
}

With options:

{
  "plugins": [
    ["transform-es2015-spread", {
      "loose": true
    }]
  ]
}

Via CLI

babel --plugins transform-es2015-spread script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["transform-es2015-spread"]
});

Options

loose

boolean, defaults to false.

In loose mode, all iterables are assumed to be arrays.