/**
 * Istanbul (JSON) coverage parser — Spec 15 R4.
 *
 * Parses Istanbul/nyc JSON coverage output. The format is a map of
 * file paths → coverage data objects with statementMap, fnMap, and hit counts.
 *
 * Format reference: https://github.com/istanbuljs/istanbuljs
 */
export interface IstanbulCoverage {
    [filePath: string]: {
        path: string;
        statementMap: Record<string, {
            start: {
                line: number;
                column: number;
            };
            end: {
                line: number;
                column: number;
            };
        }>;
        fnMap: Record<string, {
            name: string;
            decl: {
                start: {
                    line: number;
                    column: number;
                };
                end: {
                    line: number;
                    column: number;
                };
            };
            loc: {
                start: {
                    line: number;
                    column: number;
                };
                end: {
                    line: number;
                    column: number;
                };
            };
            line?: number;
        }>;
        branchMap: Record<string, unknown>;
        /** Statement hit counts: statementId → execution count */
        s: Record<string, number>;
        /** Function hit counts: functionId → execution count */
        f: Record<string, number>;
        /** Branch hit counts */
        b: Record<string, number[]>;
        /** Full path to the source file */
        [key: string]: unknown;
    };
}
interface ParsedFile {
    sourceFile: string;
    /** Set of covered line numbers (statement hit count > 0) */
    coveredLines: Set<number>;
    /** Map of function name → { line, hitCount } */
    functions: Map<string, {
        line: number;
        hitCount: number;
    }>;
    /** Total statements */
    totalStatements: number;
    /** Covered statements */
    coveredStatements: number;
}
/**
 * Parse Istanbul JSON coverage data string.
 */
export declare function parseIstanbul(content: string): ParsedFile[];
/**
 * Convert Istanbul parsed files to a file → covered lines map.
 */
export declare function istanbulToLineCoverage(files: ParsedFile[]): Map<string, Set<number>>;
/**
 * Convert Istanbul parsed files to a file → covered function names map.
 */
export declare function istanbulToFunctionCoverage(files: ParsedFile[]): Map<string, Set<string>>;
export {};
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