import { type CellGrid } from "./cellGrid.js";
export interface FallingPiece<TShape extends string = string> {
    readonly shape: TShape;
    readonly rotation: number;
    readonly x: number;
    readonly y: number;
}
export type ShapeTable<TShape extends string = string> = Record<TShape, readonly (readonly (readonly [number, number])[])[]>;
/** @internal */
export declare function pieceCells<TShape extends string>(table: ShapeTable<TShape>, piece: FallingPiece<TShape>): readonly (readonly [number, number])[];
/** @internal */
export declare function pieceCollides<T, TShape extends string>(grid: CellGrid<T>, table: ShapeTable<TShape>, piece: FallingPiece<TShape>): boolean;
/** @internal */
export declare function mergePiece<T, TShape extends string>(grid: CellGrid<T>, table: ShapeTable<TShape>, piece: FallingPiece<TShape>, value: T): CellGrid<T>;
/** @internal */
export declare function dropDistance<T, TShape extends string>(grid: CellGrid<T>, table: ShapeTable<TShape>, piece: FallingPiece<TShape>): number;
/** @internal */
export declare function gravityInterval(level: number, base?: number, perLevel?: number, min?: number): number;
/** @internal */
export declare function levelForLines(lines: number, linesPerLevel?: number): number;
/** @internal */
export declare function lineScore(cleared: number, level: number, table?: readonly number[]): number;
export interface LockDelayState {
    readonly delaySeconds: number;
    readonly elapsed: number;
}
/** @internal */
export declare function createLockDelay(delaySeconds: number): LockDelayState;
/** @internal */
export declare function stepLockDelay(state: LockDelayState, grounded: boolean, dt: number): {
    state: LockDelayState;
    locked: boolean;
};