import { EnumLowerCaseValue } from '../../internals/types.js';
import { Serializable } from '../../internals/serializable.js';
import '../../internals/helpers/guards.js';

/**
 * Copyright 2025 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

declare const Role: {
    readonly ASSISTANT: "assistant";
    readonly SYSTEM: "system";
    readonly USER: "user";
};
type RoleType = EnumLowerCaseValue<typeof Role> | string;
interface BaseMessageMeta {
    [key: string]: any;
    createdAt?: Date;
}
interface BaseMessageInput {
    role: RoleType;
    text: string;
    meta?: BaseMessageMeta;
}
declare class BaseMessage extends Serializable {
    readonly role: RoleType;
    readonly text: string;
    readonly meta?: BaseMessageMeta | undefined;
    constructor(role: RoleType, text: string, meta?: BaseMessageMeta | undefined);
    static of({ role, text, meta }: BaseMessageInput): BaseMessage;
    createSnapshot(): {
        role: string;
        text: string;
        meta: BaseMessageMeta | undefined;
    };
    loadSnapshot(state: ReturnType<typeof this.createSnapshot>): this & {
        role: string;
        text: string;
        meta: BaseMessageMeta | undefined;
    };
}

export { BaseMessage, type BaseMessageInput, type BaseMessageMeta, Role, type RoleType };