/**
 * @module client_credentials_builder
 * @description Fluent builder for constructing {@link ClientCredentialsFlow} instances.
 * Provides setter methods for the model callbacks required by the Client Credentials
 * grant - a machine-to-machine flow with no end-user involvement.
 */
import { ClientCredentialsFlow, ClientCredentialsFlowOptions, ClientCredentialsGrantContext, ClientCredentialsModel, ClientCredentialsTokenRequest } from "../grants/client_credentials.js";
import { OAuth2AccessTokenResult, OAuth2GenerateAccessTokenFunction, OAuth2GetClientFunction } from "../grants/flow.js";
import { OAuth2FlowBuilder } from "./flow_builder.js";
/**
 * Fluent builder for {@link ClientCredentialsFlow}.
 *
 * Collects the required model callbacks through chainable setter methods, then
 * produces a fully configured `ClientCredentialsFlow` instance via {@link build}.
 *
 * Note: the `none` client authentication method is intentionally disabled for this
 * flow - client credentials require the client to authenticate with a secret.
 *
 * @example
 * ```ts
 * const flow = new ClientCredentialsFlowBuilder({ tokenEndpoint: "/token" })
 *   .setScopes({ "read:data": "Read access to data" })
 *   .clientSecretBasicAuthenticationMethod()
 *   .getClient(async ({ clientId, clientSecret }) => db.findClient(clientId, clientSecret))
 *   .generateAccessToken(async (ctx) => ({ accessToken: issueToken(ctx) }))
 *   .build();
 * ```
 */
export declare class ClientCredentialsFlowBuilder extends OAuth2FlowBuilder {
    protected model: ClientCredentialsModel;
    /**
     * Creates a new `ClientCredentialsFlowBuilder` with the given partial options.
     * Model callbacks default to no-op implementations and must be replaced with the
     * appropriate setter methods before calling {@link build}.
     * @param params - Partial flow options; `model` is extracted and managed separately
     *   from the base builder params.
     */
    constructor(params: Partial<ClientCredentialsFlowOptions>);
    /**
     * Disabled for the Client Credentials flow. Client credentials require the client
     * to authenticate with a secret, so the `none` method is not supported.
     * Calling this method has no effect.
     * @returns `this` for chaining.
     */
    noneAuthenticationMethod(): this;
    /**
     * Sets the model callback used to look up and authenticate a client by its ID and
     * secret at the token endpoint.
     * @param handler - The client lookup function for client credentials token requests.
     * @returns `this` for chaining.
     */
    getClient(handler: OAuth2GetClientFunction<ClientCredentialsTokenRequest>): this;
    /**
     * Sets the model callback responsible for generating an access token for the
     * authenticated client.
     * @param handler - The access token generation function.
     * @returns `this` for chaining.
     */
    generateAccessToken(handler: OAuth2GenerateAccessTokenFunction<ClientCredentialsGrantContext, OAuth2AccessTokenResult | string>): this;
    /**
     * Assembles the complete {@link ClientCredentialsFlowOptions} from the builder state.
     * @returns The options object passed to the `ClientCredentialsFlow` constructor.
     */
    protected buildParams(): ClientCredentialsFlowOptions;
    /**
     * Constructs and returns a fully configured {@link ClientCredentialsFlow} instance.
     * @returns A new `ClientCredentialsFlow` ready for use in a route handler.
     */
    build(): ClientCredentialsFlow;
}
//# sourceMappingURL=client_credentials_builder.d.ts.map