import type { CallInterceptor } from './call-interceptor.js';
export declare function onStart(fn: (ctx: {
    path: string[];
    input: unknown;
    context: unknown;
    signal?: AbortSignal;
}) => void | Promise<void>): CallInterceptor;
export declare function onSuccess(fn: (ctx: {
    path: string[];
    input: unknown;
    context: unknown;
    signal?: AbortSignal;
}, output: unknown) => void | Promise<void>): CallInterceptor;
export declare function onError(fn: (ctx: {
    path: string[];
    input: unknown;
    context: unknown;
    signal?: AbortSignal;
}, error: unknown) => void | Promise<void>): CallInterceptor;
export declare function onFinish(fn: (ctx: {
    path: string[];
    input: unknown;
    context: unknown;
    signal?: AbortSignal;
}, result: {
    ok: true;
    output: unknown;
} | {
    ok: false;
    error: unknown;
}) => void | Promise<void>): CallInterceptor;
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