Typescript useful functions & helpers list.

index.md

Typescript Useful Functions & Helpers

Objects

type Diff<T extends string, U extends string> = ({[P in T]: P } & {[P in U]: never } & { [x: string]: never })[T]

type Omit<T, K extends Extract<keyof T, string>> = Pick<T, Diff<Extract<keyof T, string>, K>>

type OrNull<T> = T | null

type PartialOrNull<T> = OrNull<Partial<T>>

type ReadOnly<T> = {
    readonly [P in keyof T]: T[P];
}

Classes

Constructor

type Constructor<T> = new(...args: any[]) => T