import { ToolCallEngine, MultimodalToolCallResult, ChatCompletionMessageParam, StreamProcessingState, StreamChunkResult, ChatCompletionChunk } from '@multimodal/agent-interface';
/**
 * Base implementation of ToolCallEngine with common functionality
 *
 * This abstract base class provides shared implementations for common operations
 * across different tool call engines, reducing code duplication and improving maintainability.
 */
export declare abstract class BaseToolCallEngine extends ToolCallEngine {
    /**
     * Build historical tool call result messages for non-native engines
     *
     * This is the common implementation used by both PromptEngineering and StructuredOutputs engines
     * since they both format tool results as user messages rather than tool messages.
     */
    protected buildNonNativeToolCallResultMessages(toolResults: MultimodalToolCallResult[]): ChatCompletionMessageParam[];
    /**
     * Build historical tool call result messages for native engines
     *
     * This implementation is used by native engines that support OpenAI's tool protocol
     * with separate tool and user message roles.
     */
    protected buildNativeToolCallResultMessages(toolResults: MultimodalToolCallResult[]): ChatCompletionMessageParam[];
    /**
     * Create a basic streaming processing state
     *
     * Provides a default implementation that can be extended by specific engines
     */
    initStreamProcessingState(): StreamProcessingState;
    /**
     * Extract reasoning content from chunk delta
     *
     * Common logic for processing reasoning content across different engines
     */
    protected extractReasoningContent(delta: any): string;
    /**
     * Update finish reason from chunk
     *
     * Common logic for updating finish reason from streaming chunks
     */
    protected updateFinishReason(chunk: ChatCompletionChunk, state: StreamProcessingState): void;
    /**
     * Create a basic stream chunk result
     *
     * Helper method to create StreamChunkResult with common structure
     */
    protected createStreamChunkResult(content?: string, reasoningContent?: string, hasToolCallUpdate?: boolean, toolCalls?: any[], streamingToolCallUpdates?: any): StreamChunkResult;
}
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