import { type KeypadKey } from "../../keypad";
import type { PerseusExpressionWidgetOptions } from "../../data-schema";
/**
 * Scrape the answer forms for any variables or contants (like Pi)
 * that need to be included as keys on the keypad.
 */
declare function deriveExtraKeys(widgetOptions: PerseusExpressionWidgetOptions): KeypadKey[];
export default deriveExtraKeys;