/**
 * Settles like `promise` if it settles before `deadline` (a `Date.now()`
 * value). Otherwise calls `onTimeout`: an `Error` it returns rejects, any
 * other value resolves. Internal; not re-exported.
 */
export declare function withDeadline<T, F>(deadline: number, promise: Promise<T>, onTimeout: () => F): Promise<T | (F extends Error ? never : F)>;
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