/**
 * Initializes a custom function within the captcha iframe to extract parameters.
 *
 * This function injects a script that extracts the required parameters from the captcha page.
 * It creates a canvas to work with captcha images, extracts image tiles, and provides metadata like
 * rows, columns, and a base64-encoded image of the current captcha state.
 *
 * @async
 * @function initCaptchaParamsExtractor
 * @param {import('puppeteer').Frame} frame - A Puppeteer frame representing the reCAPTCHA iframe.
 * @returns {Promise<void>} This function doesn't return a value itself but adds a function (`getRecaptchaParams`)
 *                          into the frame context to extract captcha parameters.
 * @throws Will reject the promise if reCAPTCHA elements cannot be found on the page.
 */
export declare const initCaptchaParamsExtractor: (frame: any) => Promise<void>;