updeep-remeda/dist/constant.d.ts

/**
 * Returns a function that always returns the supplied value.
 *
 * Useful for replacing an object outright rather than merging it.
 *
 * @function
 * @sig a -> (* -> a)
 * @memberOf u
 * @param  {*} value what to return from returned function.
 * @return {function} a new function that will always return value.
 *
 * @example
 * var alwaysFour = u.constant(4);
 * expect(alwaysFour(32)).toEqual(4);
 *
 * @example
 * var user = {
 *   name: 'Mitch',
 *   favorites: {
 *     band: 'Nirvana',
 *     movie: 'The Matrix'
 *   }
 * };
 *
 * var newFavorites = {
 *   band: 'Coldplay'
 * };
 *
 * var result = u({ favorites: u.constant(newFavorites) }, user);
 *
 * expect(result).toEqual({ name: 'Mitch', favorites: { band: 'Coldplay' } });
 */
export default function constant<T>(value: T): () => Readonly<T>;
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