import type { Reducer } from "./api.js";
/**
 * Reducer to successively subtract values from optional `init` value
 * (default: 0).
 */
export declare function sub(init?: number): Reducer<number, number>;
export declare function sub(src: Iterable<number>): number;
export declare function sub(init: number, src: Iterable<number>): number;
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