export interface BunCoverageLoaderOptions {
    rootDir: string;
}
/**
 * Registers a Bun loader plugin that runs istanbul-lib-instrument over the
 * project's TypeScript sources so `__coverage__` counters exist at runtime.
 * Bun has no V8 precise coverage (`node:inspector` throws "Coverage APIs are
 * not supported"), so instrumentation at load time is the coverage backend
 * there. Must be called before the user bootstrap is imported.
 */
export declare function registerBunCoverageLoader({ rootDir, }: BunCoverageLoaderOptions): Promise<void>;