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/**
 * Always returns true.
 * @return {boolean} true.
 */
export function TRUE(): boolean;
/**
 * Always returns false.
 * @return {boolean} false.
 */
export function FALSE(): boolean;
/**
 * A reusable function, used e.g. as a default for callbacks.
 *
 * @return {void} Nothing.
 */
export function VOID(): void;
/**
 * Wrap a function in another function that remembers the last return.  If the
 * returned function is called twice in a row with the same arguments and the same
 * this object, it will return the value from the first call in the second call.
 *
 * @param {function(...any): ReturnType} fn The function to memoize.
 * @return {function(...any): ReturnType} The memoized function.
 * @template ReturnType
 */
export function memoizeOne(fn: (...args: any[]) => ReturnType): (...args: any[]) => ReturnType;
/**
 * @template T
 * @param {function(): (T | Promise)} getter A function that returns a value or a promise for a value.
 * @return {Promise} A promise for the value.
 */
export function toPromise(getter: () => (T | Promise)): Promise;
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