/**
 * Message format conversion utilities for Braintrust.
 *
 * Converts AI SDK message format (v4/v5) to OpenAI Chat Completion format,
 * which Braintrust requires for proper rendering of threads.
 */
/**
 * Remove null and undefined values from an object (shallow)
 */
export declare function removeNullish<T extends Record<string, unknown>>(obj: T): Partial<T>;
/**
 * AI SDK content part types (both v4 and v5)
 */
interface AISDKTextPart {
    type: 'text';
    text: string;
}
interface AISDKImagePart {
    type: 'image';
    image?: string | Uint8Array | URL;
    mimeType?: string;
}
interface AISDKFilePart {
    type: 'file';
    data?: string | Uint8Array | URL;
    filename?: string;
    name?: string;
    mimeType?: string;
}
interface AISDKReasoningPart {
    type: 'reasoning';
    text?: string;
}
interface AISDKToolCallPart {
    type: 'tool-call';
    toolCallId: string;
    toolName: string;
    args?: unknown;
    input?: unknown;
}
interface AISDKToolResultPart {
    type: 'tool-result';
    toolCallId: string;
    result?: unknown;
    output?: unknown;
}
type AISDKContentPart = AISDKTextPart | AISDKImagePart | AISDKFilePart | AISDKReasoningPart | AISDKToolCallPart | AISDKToolResultPart | {
    type: string;
    [key: string]: unknown;
};
/**
 * AI SDK message format (input format for conversion)
 */
interface AISDKMessage {
    role: 'user' | 'assistant' | 'system' | 'tool';
    content: string | AISDKContentPart[];
    [key: string]: unknown;
}
/**
 * OpenAI Chat Completion tool call format
 */
export interface OpenAIToolCall {
    id: string;
    type: 'function';
    function: {
        name: string;
        arguments: string;
    };
}
/**
 * OpenAI Chat Completion message format (output format)
 */
export interface OpenAIMessage {
    role: 'user' | 'assistant' | 'system' | 'tool';
    content: string;
    tool_calls?: OpenAIToolCall[];
    tool_call_id?: string;
    [key: string]: unknown;
}
/**
 * Converts AI SDK message format to OpenAI Chat Completion format for Braintrust.
 *
 * Supports both AI SDK v4 and v5 formats:
 *   - v4 uses 'args' for tool calls and 'result' for tool results
 *   - v5 uses 'input' for tool calls and 'output' for tool results
 *
 * AI SDK format:
 *   { role: "user", content: [{ type: "text", text: "hello" }] }
 *   { role: "assistant", content: [{ type: "text", text: "..." }, { type: "tool-call", toolCallId: "...", toolName: "...", args: {...} }] }
 *   { role: "tool", content: [{ type: "tool-result", toolCallId: "...", result: {...} }] }
 *
 * OpenAI format (what Braintrust expects):
 *   { role: "user", content: "hello" }
 *   { role: "assistant", content: "...", tool_calls: [{ id: "...", type: "function", function: { name: "...", arguments: "..." } }] }
 *   { role: "tool", content: "result", tool_call_id: "..." }
 */
export declare function convertAISDKMessage(message: AISDKMessage | OpenAIMessage | unknown): OpenAIMessage | unknown;
export {};
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