export type WhichOptions = {
    all?: boolean;
    path?: string;
    pathExt?: string;
    nothrow?: boolean;
    delimiter?: string;
};
export type WhichOptionsFindAll = WhichOptions & {
    all: true;
};
export type WhichOptionsFindOne = WhichOptions & {
    all?: false;
};
export type WhichOptionsNoThrow = WhichOptions & {
    nothrow: true;
};
export type WhichOptionsThrow = WhichOptions & {
    nothrow?: false;
};
export type WhichOptionsFindOneThrow = WhichOptionsFindOne & WhichOptionsThrow;
export type WhichOptionsFindOneNoThrow = WhichOptionsFindOne & WhichOptionsNoThrow;
export type WhichOptionsFindAllNoThrow = WhichOptionsFindAll & WhichOptionsNoThrow;
export type WhichOptionsFindAllThrow = WhichOptionsFindAll & WhichOptionsThrow;
export declare function which(cmd: string): Promise<string>;
export declare function which(cmd: string, opt: WhichOptionsFindAllNoThrow): Promise<string[] | null>;
export declare function which(cmd: string, opt: WhichOptionsFindOneNoThrow): Promise<string | null>;
export declare function which(cmd: string, opt: WhichOptionsFindAllThrow): Promise<string[]>;
export declare function which(cmd: string, opt: WhichOptionsFindOneThrow): Promise<string>;
export declare function which(cmd: string, opt: WhichOptionsFindOne): Promise<string | null>;
export declare function which(cmd: string, opt: WhichOptionsNoThrow): Promise<string[] | string | null>;
export declare function which(cmd: string, opt: WhichOptionsFindAll): Promise<string[] | null>;
export declare function which(cmd: string, opt: WhichOptions): Promise<string[] | string | null>;
export declare function whichSync(cmd: string): string;
export declare function whichSync(cmd: string, opt: WhichOptionsFindAllNoThrow): string[] | null;
export declare function whichSync(cmd: string, opt: WhichOptionsFindOneNoThrow): string | null;
export declare function whichSync(cmd: string, opt: WhichOptionsFindAllThrow): string[];
export declare function whichSync(cmd: string, opt: WhichOptionsFindOneThrow): string;
export declare function whichSync(cmd: string, opt: WhichOptionsFindOne): string | null;
export declare function whichSync(cmd: string, opt: WhichOptionsNoThrow): string[] | string | null;
export declare function whichSync(cmd: string, opt: WhichOptionsFindAll): string[] | null;
export declare function whichSync(cmd: string, opt?: WhichOptions): string[] | string | null;