import { Mock, Params, Predicate, Return } from '../types';
export declare function on(filter: Params): Half;
export declare function on(when: (params: Params) => boolean): Half;
export declare function on(filter: Params, when: (params: Params) => boolean): Half;
declare class Half {
    private readonly filter;
    private readonly predicate;
    constructor({ filter, predicate }: {
        filter?: Params;
        predicate?: Predicate;
    });
    return(ret: Return): Mock;
}
export {};
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