import type { CopilotStreamEvent, CopilotUsage } from './copilot-runner-types.js';
/**
 * Sum the per-model token counts out of a `--usage-output-file` payload.
 * Returns undefined — never a zeroed object — when the file has no model
 * metrics to read, so a caller can tell "copilot made no model call" (the
 * file is still written, with `modelMetrics: {}`) apart from a number it
 * actually measured. Summing across models covers a session that switched
 * model mid-run. Exported for unit testing against the captured fixture in
 * copilot-runner.test.ts.
 */
export declare function parseCopilotUsage(raw: string): CopilotUsage | undefined;
/** Parse ONE NDJSON line into a normalized stream event (or null if it
 *  carries nothing to yield). Shared by the incremental streaming path and
 *  the batch parseCopilotEvents helper below (kept for unit testing against
 *  fixture lines — copilot-runner.test.ts). */
export declare function handleLine(line: string): CopilotStreamEvent | null;
/** Pure NDJSON parser — exported for unit testing against fixture lines
 *  (copilot-runner.test.ts). */
export declare function parseCopilotEvents(lines: string[]): {
    texts: string[];
    rawTexts: string[];
};
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