export type OptionalPropertyNames<T> = {
    [K in keyof T]-?: {} extends {
        [P in K]: T[K];
    } ? K : never;
}[keyof T];
export type SpreadProperties<L, R, K extends keyof L & keyof R> = {
    [P in K]: L[P] | Exclude<R[P], undefined>;
};
/** @deprecated Because it can cause https://github.com/n1ru4l/envelop/issues/1120. */
export type Id<T> = T extends infer U ? {
    [K in keyof U]: U[K];
} : never;
export type SpreadTwo<L, R> = Pick<L, Exclude<keyof L, keyof R>> & Pick<R, Exclude<keyof R, OptionalPropertyNames<R>>> & Pick<R, Exclude<OptionalPropertyNames<R>, keyof L>> & SpreadProperties<L, R, OptionalPropertyNames<R> & keyof L>;
export type Spread<A extends readonly [...any]> = A extends [infer L, ...infer R] ? SpreadTwo<L, Spread<R>> : {};
export type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (k: infer I) => void ? I : never;
export type LastOf<T> = UnionToIntersection<T extends any ? () => T : never> extends () => infer R ? R : never;
export type Push<T extends any[], V> = [...T, V];
export type TuplifyUnion<T, L = LastOf<T>, N = [T] extends [never] ? true : false> = true extends N ? [] : Push<TuplifyUnion<Exclude<T, L>>, L>;
export type Unarray<T> = T extends Array<infer U> ? U : T;
export type ArbitraryObject = Record<string | number | symbol, any>;
export { MaybePromise as PromiseOrValue } from '@whatwg-node/promise-helpers';
export type AsyncIterableIteratorOrValue<T> = T | AsyncIterableIterator<T>;
export type Maybe<T> = T | null | undefined;
export type Optional<T> = T | Maybe<T> | false;
export interface ObjMap<T> {
    [key: string]: T;
}
export type ObjMapLike<T> = ObjMap<T> | {
    [key: string]: T;
};
export interface ReadOnlyObjMap<T> {
    readonly [key: string]: T;
}
export type ReadOnlyObjMapLike<T> = ReadOnlyObjMap<T> | {
    readonly [key: string]: T;
};