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.

An arrow function expression is a compact alternative to a function expression.

(c) MDN

🐊Putout plugin adds ability to convert assignment to arrow function.

npm i @putout/plugin-convert-assignment-to-arrow-function -D

{
    "rules": {
        "convert-assignment-to-arrow-function": "on"
    }
}

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

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

MIT