@checker/nullish

A TypeScript utility library providing a comprehensive set of functions to validate, verify, and perform checks on nullish. This package provides tools to help you manage null, undefined, and nullish values in your code with ease.

Installation

NPM:

npx jsr add @checker/nullish

PNPM:

pnpm dlx jsr add @checker/nullish

Deno:

deno add @checker/nullish

Yarn:

yarn dlx jsr add @checker/nullish

Bun:

bunx jsr add @checker/nullish

Functions

check_is_null

Checks if the given value is strictly null.

check_is_null(null); // true
check_is_null(undefined); // false

check_is_not_null

Checks if the given value is not strictly null.

check_is_not_null(undefined); // true
check_is_not_null(null); // false

check_is_undefined

Checks if the given value is strictly undefined.

check_is_undefined(undefined); // true
check_is_undefined(null); // false

check_is_not_undefined

Checks if the given value is not strictly undefined.

check_is_not_undefined(null); // true
check_is_not_undefined(undefined); // false

check_is_nullish

Checks if the given value is nullish (either null or undefined).

check_is_nullish(null); // true
check_is_nullish(undefined); // true
check_is_nullish(0); // false

check_is_not_nullish

Checks if the given value is not nullish (neither null nor undefined).

check_is_not_nullish(0); // true
check_is_not_nullish(null); // false
check_is_not_nullish(undefined); // false

License

MIT License