/**
 * Merges a number of callbacks together
 * @param callbacks The list of callbacks to be merged
 * @returns The resulting callback that calls all callbacks
 */
export declare function mergeCallbacks<A extends Array<any>>(callbacks: (((...args: A) => void) | undefined)[]): (...args: A) => void;
/**
 * Merges a number of callbacks together, possibly returning undefined if no callbacks were supplied
 * @param callbacks The list of callbacks to be merged
 * @returns The resulting callback that calls all callbacks, which returns the result of the last passed cb
 */
export declare function mergeCallbacksOptional<A extends Array<any>, B>(callbacks: (((...args: A) => B) | undefined)[]): undefined | ((...args: A) => B);
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