import * as React from "react";
export interface UpdateOverlayProps {
    /** "downloading" shows a progress-aware label; "restarting" is the moment
     *  between a finished download and the reload call that applies it. */
    phase: "downloading" | "restarting";
    /** 0-1, and only meaningful while downloading. Undefined when the update
     *  server sent no Content-Length for expo-updates to compute it from, which
     *  is why the percentage renders conditionally rather than defaulting to 0 —
     *  a "0%" that never moves reads as a stall. */
    progress?: number;
    /**
     * Glyph shown inside the ring. Defaults to the Entropy mark.
     *
     * A slot rather than a name or an icon set, because the consumers genuinely
     * differ: vault shows its own product mark, wheatley and glados show the
     * shared one. Whatever is passed must not derive its colour from the theme,
     * for the reason in the header — pass an explicit ink.
     */
    mark?: React.ReactNode;
    /**
     * Force a colour scheme instead of following the system.
     *
     * Dark-only apps pass `"dark"`: without it the overlay would follow a light
     * system setting and render a white flash before a dark app.
     */
    scheme?: "light" | "dark";
    /**
     * Ground colour override.
     *
     * Defaults to the palette's own background. Worth setting when the native
     * splash and window background use a specific value — matching it makes the
     * overlay read as a continuation of the launch rather than a second screen.
     */
    background?: string;
    /** Label under the ring while downloading. */
    downloadingLabel?: string;
    /** Label under the ring while restarting. */
    restartingLabel?: string;
}
export declare function UpdateOverlay({ phase, progress, mark, scheme, background, downloadingLabel, restartingLabel, }: UpdateOverlayProps): React.JSX.Element;
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