getUncoveredLinesFromStatements.ts

import type { StatementCoverageReport } from "../types/JsonFinal";

type LineRange = {
	start: number;
	end: number;
};

const getUncoveredLinesFromStatements = ({
	s,
	statementMap,
}: StatementCoverageReport): LineRange[] => {
	const keys = Object.keys(statementMap);

	const uncoveredLineRanges = keys.reduce<LineRange[]>((acc, key) => {
		if (s[key] === 0) {
			const lastRange = acc.at(-1);

			if (lastRange && lastRange.end === statementMap[key].start.line - 1) {
				lastRange.end = statementMap[key].end.line;
				return acc;
			}

			acc.push({
				start: statementMap[key].start.line,
				end: statementMap[key].end.line,
			});
		}
		return acc;
	}, []);

	return uncoveredLineRanges;
};

export { getUncoveredLinesFromStatements };

export type { LineRange };