/**
 * Retrieve help on a function or constant. Mirrors mathjs `math.help`.
 *
 *     help('sin').toString()
 *     help(add)               // resolves the function back to its name
 *
 * @param search  A function-name string, or a function/constant value.
 * @returns A `Help` object (stringifies to the documentation text).
 */
export declare function help(search: unknown): unknown;
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