eslint-plugin-let-and-var

Use block scopes and let while retaining function scopes and var.

Useful in retaining a function-first methodology in reasoning while keeping the strengths of let: while functions can be considered a type of block scope there is power in thinking in functions over blocks (ex: Array.prototype methods).

See For and against let for other arguments and details.

Couple this with prefer-const. This is an alternative to the (extreme) no-var.

Installation

You'll first need to install ESLint:

$ npm i eslint --save-dev

Next, install eslint-plugin-let-and-var:

$ npm install eslint-plugin-let-and-var --save-dev

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

Usage

Add let-and-var to the plugins section of your .eslintrc.* configuration file. You can omit the eslint-plugin- prefix:

{
    "plugins": [
        "let-and-var"
    ]
}

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

{
    "rules": {
        "prefer-const": 2,
        "no-var": 0,
        "let-and-var/scopes": 2
    }
}

Supported Rules

• scopes

  Use let in block scopes and var in function scopes.