@putout/plugin-assignment [![NPM version][NPMIMGURL]][NPMURL]

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> The assignment operator (=) is used to assign a value to a variable. The assignment operation evaluates to the assigned value. Chaining the assignment operator is possible in order to assign a single value to multiple variables.

🐊Putout plugin adds ability to transform to new Node.js API and apply best practices.

Install

``
npm i putout @putout/plugin-assignment -D
`

Rules

- ✅ convert-to-arrow-function;
- ✅ convert-to-comparison;
- ✅ convert-to-declaration;
- ✅ simplify;
- ✅ split;

Config

`json
{
"rules": {
"assignment/convert-to-arrow-function": "on",
"assignment/convert-to-comparison": "on",
"assignment/convert-to-declaration": "on",
"assignment/simplify": "on",
"assignment/split": "on"
}
}
`

convert-to-arrow-function

> An arrow function expression is a compact alternative to a function expression.
>
> (c) MDN

Rule adds ability to convert assignment to arrow function.

$3

`js
const createRegExp = a = RegExp(a, 'g');
`

$3

`js
const createRegExp = (a) => RegExp(a, 'g');
`

convert-to-comparison]

> You should almost never have an if...else with an assignment like a = b as a condition.
>
> (c) MDN

$3

`js
if (a = b) {}
`

$3

`js
if (a === b) {}
`

convert-to-declaration

> The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an object, its properties can be added, updated, or removed.
>
> (c) MDN

Checkout in 🐊Putout Editor.

❌ Example of incorrect code

`js
a = 5;
`

✅ Example of correct code

`js
const a = 5;
`

simplify

$3

`js
const {a} = {
a: 5,
};

const [b] = [5];
const c = (() => 7)();
`

$3

`js
const a = 5;
const b = 5;
const c = 7;
`

split

Rule adds ability to find and split variable declarations because (re)moving a line is simpler and less error prone then changing coma (=) to colon (;).

For the same reason, diff of changed declarations are more comfortable to read. Checkout in 🐊Putout Editor.

❌ Example of incorrect code

`js
a = b = c = 1;
`

✅ Example of correct code

`js
a = 1;
b = a;
c = a;
``

License

MIT