/**
 * Parses the line-oriented JSON a background task's agent process writes to
 * stdout (`claude -p --output-format stream-json --verbose`) into the two
 * things TaskManager actually needs: compact human-readable progress lines
 * for the canvas pane's live activity view, and the final result event's
 * error state. Pure and defensive — a task's stdout is another program's
 * output format, so anything unrecognized degrades to "no update", never a
 * throw.
 *
 * Event shapes handled (everything else is ignored):
 * - {"type":"system","subtype":"init",...}            → "Agent started"
 * - {"type":"assistant","message":{"content":[...]}}  → one line per block:
 *     {"type":"tool_use","name":"Write","input":{...}} → "Write <path/hint>"
 *     {"type":"text","text":"..."}                     → truncated snippet
 * - {"type":"result","is_error":bool,"result":"..."}  → final result
 */
export interface TaskStreamUpdate {
    /** Zero or more new progress lines (an assistant message can carry several
     *  content blocks). */
    statusLines: string[];
    /** Present only for the final "result" event. */
    result?: {
        isError: boolean;
        text: string;
    };
}
/**
 * Parses one stdout line. Returns null for anything that isn't a recognized
 * stream event (blank lines, non-JSON noise, event types we don't render).
 */
export declare function parseTaskStreamLine(line: string): TaskStreamUpdate | null;
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