/** The custom property on the document root, in px. */
export declare const FLOATING_CLEARANCE_PROPERTY = "--voice-control-clearance";
/** Fired on `document` after the published clearance changes. */
export declare const FLOATING_CLEARANCE_EVENT = "ds:voice-control-clearance";
/**
 * Record (or, with `null`, drop) one floating instance's clearance and
 * publish the largest on the document root.
 */
export declare function publishFloatingClearance(owner: object, px: number | null): void;
/** Listen for clearance changes. Returns the unsubscribe function. */
export declare function onFloatingClearanceChange(listener: () => void): () => void;
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