/**
 * Represents the outputs of dependencies as a record with keys.
 */
export type HandlerOutputs<D extends Record<string, Handler<any, any, any>>> = {
    [K in keyof D]: D[K] extends Handler<infer O, any, any> ? O : never;
};
/**
 * Represents a handler with its named dependencies and handler function.
 *
 * `Ctx` is an arbitrary context type (for example `{ req, res }` in HTTP
 * adapters). Quilt itself does not assume anything about this shape.
 */
export type Handler<O, Ctx, D extends Record<string, Handler<any, Ctx, any>> = Record<string, Handler<any, Ctx, any>>> = {
    /**
     * Named dependency handlers. Their outputs are made available to this
     * handler as the `deps` parameter.
     */
    dependencies: D;
    /**
     * Executes the handler.
     *
     * @param ctx  - The execution context (e.g. `{ req, res }`).
     * @param deps - The outputs from dependencies.
     */
    execute: (ctx: Ctx, deps: HandlerOutputs<D>) => Promise<O> | O;
};
/**
 * Creates a "terminal" handler in a dependency graph.
 *
 * Works for both "middleware-like" handlers (that produce values for others)
 * and "terminal" handlers at the edge of the system.
 */
export declare function createHandler<O = any, Ctx = any, D extends Record<string, Handler<any, Ctx, any>> = Record<string, Handler<any, Ctx, any>>>({ execute, dependencies, }: {
    execute: (ctx: Ctx, deps: HandlerOutputs<D>) => Promise<O> | O;
    dependencies?: D;
}): Handler<O, Ctx, D>;
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