/** @module Quantity */
/** Collects async work from formatting providers during the pre-ready phase.
 * Providers call [[addPendingWork]] to register promises that the formatter
 * will await before signaling [[QuantityFormatter.onFormattingReady]].
 * @beta
 */
export declare class FormattingReadyCollector {
    private _promises;
    /** Register async work that must complete before the formatter signals ready.
     * Call this from an `onBeforeFormattingReady` listener.
     */
    addPendingWork(work: Promise<void>): void;
    /** @internal Await all registered work with a timeout. Logs warnings for rejections and timeouts. */
    awaitAll(timeoutMs?: number): Promise<void>;
}
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