Disallow the use of the `null` literal.

Disallow the use of the null literal, to encourage using undefined instead.

Fail

let foo = null;

if (bar == null) {}

let foo;

const foo = Object.create(null);

if (foo === null) {}

Type: object

Type: boolean
Default: false

Strict equality(===) and strict inequality(!==) is ignored by default.

// eslint unicorn/no-null: ["error", {"checkStrictEquality": true}]
if (foo === null) {}