/**
 * @module
 *
 * Implements the `none` client authentication method, used by public clients
 * (e.g. native apps, SPAs) that have no client secret and authenticate solely
 * by including their `client_id` in the request body.
 *
 * @see https://datatracker.ietf.org/doc/html/rfc6749#section-2.1
 * @see https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication
 */
import { ClientAuthMethod, ClientAuthMethodResponse } from "./types.js";
/**
 * {@link ClientAuthMethod} implementation for the `none` authentication method.
 *
 * Used by public clients that cannot securely hold a client secret. Only a
 * `client_id` is extracted from the request body - no secret is required or expected.
 *
 * Typically used alongside PKCE in the Authorization Code flow.
 *
 * @see https://datatracker.ietf.org/doc/html/rfc7636
 */
export declare class NoneAuthMethod implements ClientAuthMethod {
    /**
     * The identifier for this authentication method.
     * Always `"none"`.
     */
    get method(): "none";
    /**
     * Whether the client secret is optional for this method.
     * Always `true` - public clients using `none` have no client secret.
     */
    get secretIsOptional(): boolean;
    /**
     * Extracts the `client_id` from the request body.
     *
     * Sets `hasAuthMethod` to `true` only when a `client_id` field is present in the body.
     * No `client_secret` is extracted or expected.
     *
     * Supports `application/x-www-form-urlencoded` and `application/json` content types.
     * Returns `{ hasAuthMethod: false }` for any other content type.
     *
     * @param req - The incoming HTTP request.
     * @returns The extracted `client_id`, or `{ hasAuthMethod: false }` if no
     *   `client_id` field is found in the body.
     */
    extractClientCredentials(req: Request): Promise<ClientAuthMethodResponse>;
}
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