/**
 * Pure SSE helpers for the base-platform invoke contract. Zero React / DOM /
 * platform dependencies — unit-tested in isolation (`sse.test.ts`) and shared
 * verbatim across web (Studio) and React-Native (Portal).
 */
import type { ProfileLinkRequest } from "./types.js";
export interface ParsedSseEvent {
    event: string;
    data: unknown;
}
/**
 * Parse complete `event:`/`data:` frames out of an SSE buffer. Returns the
 * parsed events plus the unparsed remainder (a partial trailing frame). Frames
 * are separated by a blank line; `data:` JSON is parsed best-effort.
 */
export declare function parseSseEvents(buffer: string): {
    events: ParsedSseEvent[];
    rest: string;
};
/**
 * Fold one `message` SSE payload into the running assistant text. `assistant`
 * messages APPEND (streaming). The success `result` message carries the SAME
 * final text, so it REPLACES rather than appends — otherwise the answer renders
 * twice. The result is also the fallback for result-only turns.
 *
 * Block boundaries become paragraph breaks: a silver `text.start` frame (and,
 * on the bypass arm, each new `assistant` message) opens a new block, so the
 * separator lands exactly there — never per `text.delta`, which must stay a
 * raw append for streaming (#91).
 */
export declare function reduceAssistantText(current: string, data: unknown): string;
/**
 * Best-effort assistant text from one `message` payload — BOTH protocols:
 *
 *  - **silver (the pod default)**: AgJSON events — `text.delta` carries the
 *    streamed text in `.delta`; every other event family (turn/message/tool
 *    lifecycle) contributes "". AgJSON never resends the final text, so
 *    deltas are append-only (no result-replacement leg).
 *  - **bypass**: SDKMessage shapes — text blocks off an `assistant` message;
 *    the success `result` string as fallback/replacement.
 *
 * The silver arm was MISSING while silver became the pod default — live
 * portal/studio chat rendered EMPTY assistant messages (0.3.2 coverage
 * audit G14, confirmed by reducing a live wire capture to "").
 */
export declare function extractAssistantText(data: unknown): string;
/** Read a string field off an SSE `data` object, or undefined. */
export declare function stringField(data: unknown, key: string): string | undefined;
/**
 * Parse a `profile-link-needed` SSE payload into a typed
 * {@link ProfileLinkRequest}, or `null` if it does not conform. `appId` must
 * be a non-empty string and `requested` exactly `"read"` or `"read-write"`;
 * extra keys are tolerated (ignored). Returns a fresh normalized object so
 * callers get exactly the typed shape, never the raw wire payload with
 * unknown extras.
 */
export declare function parseLinkRequest(data: unknown): ProfileLinkRequest | null;
//# sourceMappingURL=sse.d.ts.map