import type { CoverageService } from '@pikku/core/services';
interface CoverageLogger {
    info(message: string): void;
    warn(message: string): void;
}
/**
 * Starts the coverage backend for `pikku dev --coverage`: V8 precise coverage
 * on Node, istanbul load-time instrumentation on Bun. Must run before the
 * user bootstrap is imported so the Bun loader plugin sees every module.
 * Returns undefined (with a warning) when no backend is available.
 */
export declare function startCoverageService(logger: CoverageLogger, rootDir: string): Promise<CoverageService | undefined>;
export {};