import type { PackageMode, DecryptParams } from '@opengovsg/formsg-sdk/dist/types';
/**
 * A function that takes state and returns state (or a Promise of state)
 */
declare type Operation = (state: any) => any | Promise<any>;
/**
 * Configuration for FormSG adaptor
 * @typedef {Object} FormSGConfiguration
 * @property {string} formSecretKey - Your form's secret key from FormSG
 * @property {PackageMode} [mode='development'] - SDK mode: 'production', 'staging', or 'development'
 * @property {string} [webhookEndpoint] - The URI of your webhook endpoint
 */
export interface FormSGConfiguration {
    formSecretKey: string;
    mode?: PackageMode;
    webhookEndpoint?: string;
}
/**
 * State object for FormSG operations
 * @typedef {Object} FormSGState
 * @property {Object} data - The current data/response
 * @property {FormSGConfiguration} configuration - FormSG configuration
 * @property {Array} references - Array of previous data objects
 */
export interface FormSGState {
    data: any;
    configuration: FormSGConfiguration;
    references?: any[];
}
/**
 * Options for decrypting FormSG submissions
 * @typedef {Object} DecryptOptions
 * @property {boolean} [verifySignature=false] - Whether to verify webhook signature
 * @property {string} [signatureHeader] - The X-FormSG-Signature header value
 */
export interface DecryptOptions {
    verifySignature?: boolean;
    signatureHeader?: string;
}
/**
 * Decrypt a FormSG submission
 * @example
 * decryptSubmission($.data)
 * @example
 * decryptSubmission($.data, {
 *   verifySignature: true,
 *   signatureHeader: $.request.headers['x-formsg-signature']
 * })
 * @function
 * @public
 * @param {DecryptParams} submissionData - The encrypted submission data from FormSG webhook
 * @param {DecryptOptions} options - Options for decryption
 * @returns {Operation}
 * @state {FormSGState}
 */
export declare function decryptSubmission(submissionData: DecryptParams, options?: DecryptOptions): Operation;
/**
 * Verify a FormSG webhook signature
 * @example
 * verifyWebhook($.request.headers['x-formsg-signature'])
 * @function
 * @public
 * @param {string} signatureHeader - The X-FormSG-Signature header value
 * @returns {Operation}
 * @state {FormSGState}
 */
export declare function verifyWebhook(signatureHeader: string): Operation;
/**
 * Process a FormSG webhook (verify and decrypt in one step)
 * @example
 * processWebhook($.data, $.request.headers['x-formsg-signature'])
 * @function
 * @public
 * @param {DecryptParams} submissionData - The encrypted submission data from FormSG webhook
 * @param {string} signatureHeader - The X-FormSG-Signature header value
 * @returns {Operation}
 * @state {FormSGState}
 */
export declare function processWebhook(submissionData: DecryptParams, signatureHeader: string): Operation;
export { assert, cursor, dataPath, dataValue, dateFns, each, field, fields, fn, fnIf, lastReferenceValue, merge, sourceValue, } from '@openfn/language-common';