vexip-ui/dist/common/config/src/types.d.ts

A Vue 3 UI library, Highly customizability, full TypeScript, performance pretty good

export type EnsureValue<T> = Exclude<T, undefined | null>;
/**
 * Use to deconstruct advanced types
 */
export type Expand<T> = T extends unknown ? {
    [K in keyof T]: T[K];
} : never;
export type AnyFunction = (...args: any[]) => any;
export type VoidFunction = () => void;
export type MaybeFunction<T> = AnyFunction extends T ? T : T | (() => T);
export type DeepPartial<T> = {
    [K in keyof T]?: T[K] extends Record<any, any> ? DeepPartial<T[K]> : T[K];
};