import { Elysia } from 'elysia';
type Origin = string | RegExp | ((request: Request) => boolean | void);
export type HTTPMethod = 'ACL' | 'BIND' | 'CHECKOUT' | 'CONNECT' | 'COPY' | 'DELETE' | 'GET' | 'HEAD' | 'LINK' | 'LOCK' | 'M-SEARCH' | 'MERGE' | 'MKACTIVITY' | 'MKCALENDAR' | 'MKCOL' | 'MOVE' | 'NOTIFY' | 'OPTIONS' | 'PATCH' | 'POST' | 'PROPFIND' | 'PROPPATCH' | 'PURGE' | 'PUT' | 'REBIND' | 'REPORT' | 'SEARCH' | 'SOURCE' | 'SUBSCRIBE' | 'TRACE' | 'UNBIND' | 'UNLINK' | 'UNLOCK' | 'UNSUBSCRIBE';
type MaybeArray<T> = T | T[];
interface CORSConfig {
    /**
     * Disable AOT (Ahead of Time) compilation for plugin instance
     *
     * @default true
     */
    aot?: boolean;
    /**
     * @default `true`
     *
     * Assign the **Access-Control-Allow-Origin** header.
     *
     * Value can be one of the following:
     * - `string` - String of origin which will be directly assign to `Access-Control-Allow-Origin`
     *
     * - `boolean` - If set to true, `Access-Control-Allow-Origin` will be set to `*` (accept all origin)
     *
     * - `RegExp` - Pattern to use to test with request's url, will accept origin if matched.
     *
     * - `Function` - Custom logic to validate origin acceptance or not. will accept origin if `true` is returned.
     *   - Function will accepts `Context` just like `Handler`
     *
     *   ```typescript
     *   // ? Example usage
     *   app.use(cors, {
     *      origin: ({ request, headers }) => true
     *   })
     *
     *   // Type Definition
     *   type CORSOriginFn = (context: Context) => boolean | void
     *   ```
     *
     * - `Array<string | RegExp | Function>` - Will try to find truthy value of all options above. Will accept request if one is `true`.
     */
    origin?: Origin | boolean | Origin[];
    /**
     * @default `*`
     *
     * Assign **Access-Control-Allow-Methods** header.
     *
     * Value can be one of the following:
     * Accept:
     * - `undefined | null | ''` - Ignore all methods.
     *
     * - `*` - Accept all methods.
     *
     * - `HTTPMethod` - Will be directly set to **Access-Control-Allow-Methods**.
     * - Expects either a single method or a comma-delimited string (eg: 'GET, PUT, POST')
     *
     * - `HTTPMethod[]` - Allow multiple HTTP methods.
     * - eg: ['GET', 'PUT', 'POST']
     */
    methods?: boolean | undefined | null | '' | '*' | MaybeArray<HTTPMethod | (string & {})>;
    /**
     * @default `*`
     *
     * Assign **Access-Control-Allow-Headers** header.
     *
     * Allow incoming request with the specified headers.
     *
     * Value can be one of the following:
     * - `string`
     *     - Expects either a single method or a comma-delimited string (eg: 'Content-Type, Authorization').
     *
     * - `string[]` - Allow multiple HTTP methods.
     *     - eg: ['Content-Type', 'Authorization']
     */
    allowedHeaders?: true | string | string[];
    /**
     * @default `*`
     *
     * Assign **Access-Control-Expose-Headers** header.
     *
     * Return the specified headers to request in CORS mode.
     *
     * Value can be one of the following:
     * - `string`
     *     - Expects either a single method or a comma-delimited string (eg: 'Content-Type, 'X-Powered-By').
     *
     * - `string[]` - Allow multiple HTTP methods.
     *     - eg: ['Content-Type', 'X-Powered-By']
     */
    exposeHeaders?: true | string | string[];
    /**
     * @default `true`
     *
     * Assign **Access-Control-Allow-Credentials** header.
     *
     * Allow incoming requests to send `credentials` header.
     *
     * - `boolean` - Available if set to `true`.
     */
    credentials?: boolean;
    /**
     * @default `5`
     *
     * Assign **Access-Control-Max-Age** header.
     *
     * Allow incoming requests to send `credentials` header.
     *
     * - `number` - Duration in seconds to indicates how long the results of a preflight request can be cached.
     */
    maxAge?: number;
    /**
     * @default `true`
     *
     * Add `[OPTIONS] /*` handler to handle preflight request which response with `HTTP 204` and CORS hints.
     *
     * - `boolean` - Available if set to `true`.
     */
    preflight?: boolean;
}
export declare const cors: (config?: CORSConfig) => Elysia<"", {
    decorator: {};
    store: {};
    derive: {};
    resolve: {};
}, {
    typebox: import("@sinclair/typebox").TModule<{}>;
    error: {};
}, {
    schema: {};
    macro: {};
    macroFn: {};
    parser: {};
}, {}, {
    derive: {};
    resolve: {};
    schema: {};
}, {
    derive: {};
    resolve: {};
    schema: {};
}>;
export default cors;