import type { ChatBlock, ChatBlockEnvelope } from "./types.js";
export type BlockValidationResult = {
    ok: true;
    envelope: ChatBlockEnvelope;
} | {
    ok: false;
    error: string;
};
export declare function validateBlockEnvelope(input: unknown): BlockValidationResult;
export declare function mergeBlock(existing: ChatBlock, patch: ChatBlock): ChatBlock;
export declare function blockFallbackText(block: ChatBlock): string;
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