eslint-plugin-undef-init

Always initialize variables declarations. Instead of naked declarations, set it to undefined.

Installation

You'll first need to install ESLint:

$ npm i eslint --save-dev

Next, install eslint-plugin-undef-init:

$ npm install eslint-plugin-undef-init --save-dev

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

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

{
    "plugins": [
        "undef-init"
    ]
}

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

{
    "rules": {
        "undef-init/rule-name": 2
    }
}