export declare const makeMutex: () => {
    mutex<T>(code: () => Promise<T> | T): Promise<T>;
};
export type Mutex = ReturnType<typeof makeMutex>;
export declare const makeKeyedMutex: () => {
    mutex<T>(key: string, task: () => Promise<T> | T): Promise<T>;
};
export type KeyedMutex = ReturnType<typeof makeKeyedMutex>;
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