TypeScript utility functions

utility.ts

export type PromiseValue<T> = T extends Promise<infer U> ? U : never;

export type WithRequiredKeys<T extends object, R extends keyof T> = {
  [K in Exclude<keyof T, R>]+?: T[K];
} & {
  [K in R]-?: T[K]
}

export type RemoveIndex<T> = {
	[K in keyof T as string extends K
		? never
		: number extends K
			? never
			: symbol extends K
				? never
				: K]: T[K];
};