/**
 * Shared SSE (Server-Sent Events) data line parser for OpenAI-compatible APIs.
 * Used by: openai, google, openrouter adapters.
 *
 * Per the SSE spec, multiple `data:` lines before a blank-line event terminator
 * are concatenated with newlines into a single event payload.
 * Yields raw `data:` field values. Stops on `[DONE]` sentinel.
 * Reader lock is always released via finally block.
 */
export declare function parseSSEData(body: ReadableStream<Uint8Array>): AsyncGenerator<string>;
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