import WebGlkOte from './web.js';
export default class Metrics {
    /** When we don't know how high the screen is, use a height we've saved before, or, at the very beginning, a rough estimate */
    private height_with_keyboard;
    private loaded;
    private glkote;
    private metrics;
    private observer?;
    constructor(glkote: WebGlkOte);
    destroy(): void;
    measure(): Promise<void>;
    on_gameport_resize: import("lodash").DebouncedFunc<() => Promise<void>>;
    on_visualViewport_resize: () => void;
    /** Update the gameport height and then send new metrics */
    set_gameport_height(height: number): void;
}