eslint-plugin-const-immutable

This plugin forces all const declarations to be immutable. Ecmascript 6 don't
allow variables declared with const to be reassigned, but doesn't necassarilly
avoid mutation to the strucutures the respective variable is pointing to.

Installation

You'll first need to install ESLint:

``
$ npm i eslint --save-dev
`

Next, install eslint-plugin-const-immutable:

`
$ npm install eslint-plugin-const-immutable --save-dev
`

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-const-immutable globally.

Usage

Add const-immutable to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

`json
{
"plugins": [
"const-immutable"
]
}
`


Then configure the rules you want to use under the rules section.

`json
{
"rules": {
"const-immutable/no-mutation": 2
}
}
`

Supported Rules

$3

This rule forces the variables declared with const to remain immutable. The following code are considered problematic.

`js
const y = 1;
y = 2; // error
`

`js
const y = {a: { b: 'c' }};
y.a.b = 2; // error
`

`js
const y = {a: { b: 'c' }};
function foo() {
if (true) {
y.a.b = 2; // error
}
}
`

`js
const obj = { a: '1', b: '2' };
const {a,b} = obj;
a += 1; // error
`

`js
const obj = { a: '1' };
delete obj.a; // error
`

`js
const obj = { a: '1' };
Object.assign(obj, {a: '2'}); // error
`

$3


`json
{
"extends": "airbnb",
"plugins": [
"const-immutable"
],
"rules": {
"const-immutable/no-mutation": 2
}
}
``