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babel-plugin-transform-object-rest-spread
Advanced tools
The babel-plugin-transform-object-rest-spread package allows developers to use the object rest and spread properties syntax in their JavaScript code. This syntax is part of the ECMAScript 2018 (ES9) specification and enables more concise and readable code when copying properties from one object to another or collecting the remaining properties of an object after certain properties have been extracted.
Object Spread
Allows an object's own enumerable properties to be copied into a new object. This is useful for creating a new object with the same properties as an existing object or for combining multiple objects.
{...source}
Object Rest
Enables extracting properties from objects and binding the remaining properties to a new object. This is useful for object destructuring, where you want to separate certain properties from the rest.
{a, b, ...rest}
This is the official Babel plugin for transforming object rest and spread syntax. It is similar to babel-plugin-transform-object-rest-spread but is maintained as part of the Babel 7 release. It is the recommended package to use for Babel 7 users.
This preset includes various Babel plugins for JavaScript features that are in stage 3 of the TC39 process, including object rest and spread properties. It is broader in scope compared to babel-plugin-transform-object-rest-spread, which focuses only on object rest and spread properties.
This plugin allows Babel to transform rest properties for object destructuring assignment and spread properties for object literals.
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 }
let n = { x, y, ...z };
console.log(n); // { x: 1, y: 2, a: 3, b: 4 }
npm install --save-dev babel-plugin-transform-object-rest-spread
.babelrc
(Recommended).babelrc
{
"plugins": ["transform-object-rest-spread"]
}
babel --plugins transform-object-rest-spread script.js
require("babel-core").transform("code", {
plugins: ["transform-object-rest-spread"]
});
useBuiltIns
boolean
, defaults to false
.
By default, this plugin uses Babel's extends
helper which polyfills Object.assign
. Enabling this option will use Object.assign
directly.
.babelrc
{
"plugins": [
["transform-object-rest-spread", { "useBuiltIns": true }]
]
}
In
z = { x, ...y };
Out
z = Object.assign({ x }, y);
FAQs
Compile object rest and spread to ES5
The npm package babel-plugin-transform-object-rest-spread receives a total of 2,480,013 weekly downloads. As such, babel-plugin-transform-object-rest-spread popularity was classified as popular.
We found that babel-plugin-transform-object-rest-spread demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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