import { type SystemHandle } from '@forgeax/engine-ecs';
/**
 * Stable system name (locked by `frame-start-scan-system.test.ts`). User
 * systems reference it through `after: [FRAME_START_SCAN_SYSTEM_NAME]`
 * to ensure they observe the freshly written snapshot.
 */
export declare const FRAME_START_SCAN_SYSTEM_NAME = "input-frame-start-scan";
export declare const InputSet: import("@forgeax/engine-ecs").SystemSet;
/**
 * Resource key under which the {@link InputBackend} producer is inserted
 * (M2 — full resource-ification, D-2 / D-7). The frame-start scan system
 * declares it in `resources`; the fn body reads it back via
 * `world.getResource(INPUT_BACKEND_KEY)`.
 *
 * Aligns with the `INPUT_SNAPSHOT_RESOURCE_KEY` naming. Consumers import the
 * constant rather than the bare string so a typo degrades to an import error
 * (charter P3).
 */
export declare const INPUT_BACKEND_KEY: "InputBackend";
/**
 * The frame-start scan system token (M2 — full resource-ification, D-4).
 *
 * Module-level `defineSystem` with the real fn body — no factory, no closure.
 * Each `world.update()` tick:
 *   1. reads the {@link InputBackend} from `INPUT_BACKEND_KEY` and calls
 *      `backend.sample()` once to atomically drain the per-frame accumulators
 *      (movement delta plus key/code/button press and release edge sets);
 *   2. derives a fresh `InputSnapshot` via `snapshotFromSample`;
 *   3. writes it under `INPUT_SNAPSHOT_RESOURCE_KEY` via
 *      `world.insertResource` -- idempotent overwrite, charter P4
 *      consistent abstraction (consumers always read the same Resource key
 *      regardless of which backend produced the sample).
 *
 * Labelled `'input'` (spec §6.2 label-anchor map).
 */
export declare const InputFrameStartScan: SystemHandle<readonly []>;
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