import { Handler } from './Handler.js';
export type ExecuteHandlerHooks<Ctx> = {
    onHandlerStart?: (info: {
        handler: Handler<any, Ctx, any>;
        ctx: Ctx;
    }) => void | Promise<void>;
    onHandlerSuccess?: (info: {
        handler: Handler<any, Ctx, any>;
        ctx: Ctx;
        durationMs: number;
        output: any;
    }) => void | Promise<void>;
    onHandlerError?: (info: {
        handler: Handler<any, Ctx, any>;
        ctx: Ctx;
        durationMs: number;
        error: unknown;
    }) => void | Promise<void>;
};
/**
 * Executes a handler graph for a given context.
 *
 * Each handler runs at most once per execution, and its output is cached
 * and provided to dependants via the `deps` parameter. The final return
 * value is ignored; callers should rely on handler side-effects (for
 * example, writing to an HTTP response) or on dependency outputs.
 */
export declare function executeHandler<Ctx, D extends Record<string, Handler<any, Ctx, any>>>(handler: Handler<any, Ctx, D>, ctx: Ctx, hooks?: ExecuteHandlerHooks<Ctx>): Promise<void>;
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