effect-io-ai

Package: effect
Module: Predicate

Predicate.isUndefined

A refinement that checks if a value is undefined.

Example

import * as assert from "node:assert"
import { isUndefined } from "effect/Predicate"

assert.strictEqual(isUndefined(undefined), true)

assert.strictEqual(isUndefined(null), false)
assert.strictEqual(isUndefined("undefined"), false)

Signature

declare const isUndefined: (input: unknown) => input is undefined

Source

Since v2.0.0