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ESLint rule for suggesting that object spread properties be used instead of Object.assign().


Install ESLint and eslint-plugin-prefer-object-spread:

$ npm install --save-dev eslint eslint-plugin-prefer-object-spread


Add prefer-object-spread to the plugins section of your .eslintrc configuration file, and configure the rule under the rules section.

  "plugins": [
  "rules": {
    "prefer-object-spread/prefer-object-spread": 2

This rule suggests that object spread properties be used instead of Object.assign(). The rule is only applied when Object.assign() is used for cloning; not when it is used to extend an existing object. i.e., it applies when the first argument to Object.assign() is an object literal. This is because spread properties only iterate over own properties.

When using this rule the following patterns are considered problems:

var a = Object.assign({}, foo); // error Use a spread property instead of Object.assign(). 
var b = Object.assign({ c: 1 }, bar); // error Use a spread property instead of Object.assign(). 

The following patterns are considered okay:

var a = { };
var b = { c: 1, };
Object.assign(b, { d: 2 });