import type { ChatFinishReason, ChatStreamEvent } from "./protocol.js";
type ParsedRenderableCustomChunk = Extract<ChatStreamEvent, {
    type: "source-url" | "source-document" | "file";
}>;
export declare function isRecord(value: unknown): value is Record<string, unknown>;
export declare function normalizeNewlines(value: string): string;
export declare function toRenderableCustomChunk(value: unknown): ParsedRenderableCustomChunk | null;
export declare function parseSerializedToolResult(value: unknown): unknown;
export declare function formatToolErrorText(result: unknown): string;
export declare function mapFinishReason(reason: string | undefined): ChatFinishReason | undefined;
export declare function splitSseFrames(value: string): {
    frames: string[];
    remainder: string;
};
export declare function isCommentOnlySseFrame(raw: string): boolean;
export {};
//# sourceMappingURL=ag-ui-helpers.d.ts.map