Question

Now I know what 'pick' does. But I want to do the opposite and remove values from an object.

I want it to work similar to this:

type MyObject = {

    k0: number,
    k1: string,
    k2: boolean,
    k3: number[] 

}

let obj: Remove<MyObject, 'k1'|'k2'>

Required: { k1:number, k2:boolean }

Answer 1

You can use the keyword Omit for this task. This has been done since TypeScript 3.5.

type ObjectType = {
    k0: number,
    k1: string,
    k2: boolean,
    k3: number[]
}

let obj: Omit<ObjectType, 'k1' | 'k2'> // type is { k0: number, k2: boolean }

For older versions of TypeScript, you could also use a combination of pick and exclude.

type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;