/**
 * How much of the window the software keyboard is covering.
 *
 * A `position: fixed` sheet gets no help from the browser here — the built-in
 * "scroll the focused field into view" only moves elements that are in the
 * document flow, so on iOS the keyboard simply covers the sheet.
 *
 * The two platforms hide the keyboard in different places, and this one
 * formula covers both. iOS keeps the layout viewport at full height and
 * shrinks (and shifts) the visual viewport, so the difference is the keyboard.
 * Android resizes the layout viewport itself, so `innerHeight` shrinks too and
 * the difference falls out to zero — which is the right answer there, because
 * the bottom of the window is already above the keyboard.
 *
 * `offsetTop` matters as much as `height`: iOS shifts the visual viewport up
 * as well as shrinking it, and ignoring the shift leaves the sheet floating
 * exactly that far off, with a strip of page showing beneath it.
 */
export declare class KeyboardInset {
    private onChange;
    private timer;
    private lastReading;
    private handler;
    current(): number;
    observe(onChange: (inset: number) => void): void;
    stop(): void;
}
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