Node script for merging different Clover XML coverage files from different sources like PHPUnit and Jest

mergeClover.js

/**
 * @copyright Copyright (c) 2021 Robin Windey <ro.windey@gmail.com>
 *
 * @author Robin Windey <ro.windey@gmail.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The latest source code is available at <https://gist.github.com/R0Wi/19fa8a508d32948049267248c3c11cb1>
 *
 * This script merges the coverage data from multiple Clover-XML-files.
 * It can be useful to merge coverage files from different sources like
 * PHPUnit (PHP) and jest (JavaScript) for example.
 *
 * Example:
 * 		Assume you have created 3 different coverage files in clover format:
 * 			phpunit -c phpunit.xml --coverage-clover coverage_unittests.xml
 * 			phpunit -c phpunit.integration.xml --coverage-clover coverage_integrationtests.xml
 * 			jest --coverage
 * Usage:
 * 		Install dependencies via
 * 			npm install
 * 		Then run the script:
 * 			node mergeCoverage.js -i coverage_unittests.xml -i coverage_integrationtests.xml -i coverage_jest.xml -o mergedCoverage.json
 *
 * Parameters:
 * 		i: input files in Clover XML format
 * 		o: output file in JSON format
 */

"use strict";

// Imports
const commandLineArgs = require('command-line-args');
const fs = require("fs");
const clover = require("@cvrg-report/clover-json");
const merge = require('@connectis/coverage-merger');

// Read commandline arguments
const optionDefinitions = [
	{ name: 'inputs', alias: 'i', type: String, multiple: true },
	{ name: 'output', alias: 'o', type: String, multiple: false }
]
const options = commandLineArgs(optionDefinitions)

// Input clover files
const coverageFiles = options.inputs;

// Output JSON file for merged coverage
const resultFile = options.output;

const allResults = [];
const defaultObj = {
	found: 0,
	hit: 0,
	details: []
};

// Reads a single coverage file into a JSON object array
function readCoverage(file) {
	return new Promise(function (resolve) {
		clover.parseFile(file)
			.then(resultArr => allResults.push(resultArr))
			.catch(function (err) {
				console.error(err);
				process.exit(1);
			})
			.then(() => resolve());
	});
}

// Wait for all files to be read, merge them and write to file
Promise.all(coverageFiles.map(file => readCoverage(file)))
	.then(() => {
		const concatResults = allResults.flatMap(arr => arr.map(r => {
			// Fix for missing branches/lines/functions info in PHPUnit
			r.branches = r.branches ?? defaultObj;
			r.function = r.function ?? defaultObj;
			r.lines = r.lines ?? defaultObj;
			return r;
		}));
		const mergedResults = merge.mergeByFile(concatResults);
		fs.writeFileSync(resultFile, JSON.stringify(mergedResults, null, 2));
	});

package.json

{
  "name": "merge_clover",
  "version": "1.0.0",
  "description": "",
  "main": "mergeCoverage.js",
  "dependencies": {
    "@connectis/coverage-merger": "^1.1.0",
    "@cvrg-report/clover-json": "^0.3.2",
    "command-line-args": "^5.2.0"
  }
}