/**
 * Coverage import service — Spec 15 R4.
 *
 * Orchestrates importing coverage data from lcov .info or Istanbul JSON files,
 * auto-detecting the format and storing results in the CodeIndexDB.
 */
export type CoverageFormat = 'lcov' | 'istanbul';
export interface ImportResult {
    format: CoverageFormat;
    filesImported: number;
    entriesImported: number;
    basis: 'measured';
    source: string;
}
/**
 * Detect the coverage format from file content.
 * LCOV files start with "TN:" — Istanbul files are JSON.
 */
export declare function detectFormat(content: string): CoverageFormat;
/**
 * Import a coverage file into the CodeIndexDB.
 *
 * @param filePath - Path to the coverage file (.info or .json)
 * @param projectRoot - Project root for resolving relative paths
 * @returns Import statistics
 */
export declare function importCoverageFile(filePath: string, projectRoot: string): Promise<ImportResult>;
/**
 * Generate a coverage report from the DB.
 */
export declare function generateCoverageReport(): Promise<{
    totalFunctions: number;
    coveredFunctions: number;
    coverageRate: number;
    byRiskDecile: Array<{
        decile: number;
        covered: number;
        total: number;
        rate: number;
    }>;
    untestedTopDecile: Array<{
        functionName: string;
        filePath: string;
        riskScore: number;
        basis: string;
    }>;
    staleImport: boolean;
}>;
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