/**
 * Creates a new Promise that wraps a provided Promise with a timeout.
 * If the original Promise resolves/rejects before the timeout
 * expires, the new Promise will resolve/reject as usual,
 * otherwise, it will reject with a timeout message.
 *
 * @param originalPromise the original Promise to wrap with the timeout
 * @param ms milliseconds to wait before rejecting due to timeout
 * @param timeoutMessage optional custom timeout message, or a callback returning one
 */
export declare function timeout<T>(originalPromise: Promise<T>, ms: number, timeoutMessage?: string | (() => string)): Promise<T>;
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