Function isDefined

packages/lib/std/src/lang.ts:79–79

(value: Maybe<T>)

export type AssertType<T> = (value: unknown) => value is T
export const identity = <T>(value: T): T => value
export const isDefined = <T>(value: Maybe<T>): value is T => value !== undefined && value !== null
export const isNull = (value: unknown): value is null => value === null
export const isNotNull = <T>(value: Nullable<T>): value is T => value !== null
export const isUndefined = (value: unknown): value is undefined => value === undefined