/** Held state and frame edges; admission, focus and source merging belong to the backend. */
export declare class KeyLatch {
    readonly held: Set<string>;
    readonly pressed: Set<string>;
    readonly released: Set<string>;
    press(key: string): void;
    release(key: string): void;
    clearFrame(): void;
    clear(): void;
    releaseAll(): void;
}
export declare class ButtonLatch {
    readonly held: [boolean, boolean, boolean];
    readonly pressed: [boolean, boolean, boolean];
    readonly released: [boolean, boolean, boolean];
    set(slot: 0 | 1 | 2, down: boolean): void;
    clearFrame(): void;
    clear(): void;
    releaseAll(): void;
}
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