/**
 * Starts a Game Loop using requestAnimationFrame
 * @param update callback called every frame to update the simulation with `delta` milliseconds
 * @param render callback called once every frame to render the simulation with `alpha` interpolation argument
 * @returns a callback to stop the loop and cleanup
 */
export declare function Loop(update: (dt: number) => void, render: (alpha: number) => void, after_render?: () => void): () => void;
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