TypeScript Tools

index.ts

// https://medium.com/javascript-in-plain-english/powerful-typescript-tools-e1c7875fbb71

type KeysToUnion<T> = keyof T;

type KeysToValue<T> = T[KeysToUnion<T>]

type KeysToTuple<T> = KeysToUnion<T>[]

type OmitPartial<T, K extends keyof T> = Omit<T, K> & {
 [Key in K]?: T[Key]  
}
  
type ReadonlyPartial<T> = {
  readonly [K in keyof T]?: T[K]
}
  
type DeepReadonlyPartial<T> = {
  readonly [K in keyof T]?: 
    T[K] extends object ? DeepReadonlyPartial<T[K]> : T[K]
}