/// <reference types="@cloudflare/workers-types/2023-07-01" />
import type { Context, Env, Input, Next } from "hono";
import type { Promisify } from "hono-rate-limiter";
import type { StatusCode } from "hono/utils/http-status";
/**
 * Hono request handler that sends back a response when a client is
 * rate-limited.
 *
 * @param context {Context} - The Hono context object.
 * @param next {Next} - The Hono `next` function, can be called to skip responding.
 * @param optionsUsed {ConfigType} - The options used to set up the middleware.
 */
export type RateLimitExceededEventHandler<E extends Env = Env, P extends string = string, I extends Input = Input> = (c: Context<E, P, I>, next: Next, optionsUsed: ConfigType<E, P, I>) => void;
/**
 * The configuration options for the rate limiter.
 */
export interface ConfigType<E extends Env = Env, P extends string = string, I extends Input = Input> {
    /**
     * The response body to send back when a client is rate limited.
     *
     * Defaults to `'Too many requests, please try again later.'`
     */
    message: string | Record<string, unknown> | ((c: Context<E, P, I>) => Promisify<string | Record<string, unknown>>);
    /**
     * The HTTP status code to send back when a client is rate limited.
     *
     * Defaults to `HTTP 429 Too Many Requests` (RFC 6585).
     */
    statusCode: StatusCode;
    /**
     * The name of the property on the context object to store the rate limit info.
     *
     * Defaults to `rateLimit`.
     */
    requestPropertyName: string;
    /**
     * Method to generate custom identifiers for clients.
     */
    rateLimitBinding: RateLimit | ((c: Context<E, P, I>) => RateLimit);
    /**
     * Method to generate custom identifiers for clients.
     */
    keyGenerator: (c: Context<E, P, I>) => Promisify<string>;
    /**
     * Hono request handler that sends back a response when a client is
     * rate-limited.
     *
     * By default, sends back the `statusCode` and `message` set via the options.
     */
    handler: RateLimitExceededEventHandler<E, P, I>;
    /**
     * Method (in the form of middleware) to determine whether or not this request
     * counts towards a client's quota.
     *
     * By default, skips no requests.
     */
    skip: (c: Context<E, P, I>) => Promisify<boolean>;
}
/**
 * The configuration options for the store.
 */
export type Options<Binding> = {
    /**
     * The KV namespace to use.
     */
    namespace: Binding;
    /**
     * The text to prepend to the key in Redis.
     */
    readonly prefix?: string;
};