ci: add utils for merge coverage

Author: Alexander Kharkovey

tools/utils/merge-codecoverage/index.js

@@ -0,0 +1,99 @@
+const glob = require('glob')
+const path = require('path')
+const fs = require('fs-extra')
+const {execSync} = require('child_process')
+const { createReporter } = require('istanbul-api');
+const istanbulCoverage = require('istanbul-lib-coverage');
+
+const coverageDir = path.resolve(process.cwd(), 'coverage')
+const mergedDir = path.resolve(coverageDir, 'merged')
+
+fs.emptyDirSync(mergedDir)
+const files = glob(coverageDir + '/**/*.xml', {sync: true})
+const exludeFromName = ['apps', 'libs']
+
+files.forEach((f, i) => {
+  const x = f.split('/coverage/')[1].replace(/\//g, '-').split('/').pop()
+    .split('-').filter(i => i !== 'apps' && i !== 'libs' && i !== 'cobertura').join('-')
+  fs.copySync(f, `${mergedDir}/${x}`)
+})
+
+const filesMerged = glob(mergedDir + '/**/*.xml', {sync: true})
+
+const packages = filesMerged
+  .map((f, i) => {
+    const fileName = path.basename(f)
+    const projectName = fileName.split('-')
+    projectName.pop()
+
+    return `${projectName.join('-')}=${fileName}`
+  })
+  .join(' ')
+
+
+
+const script = `npx cobertura-merge -o merged-cobertura-coverage.xml ${packages}`
+
+execSync(script, {
+  stdio: [0, 1, 2],
+  cwd: mergedDir,
+})
+
+
+const reporter = createReporter();
+
+/* [ Configuration ] */
+const rootDir = './coverage';
+const reportOut = './coverage/report';
+
+const normalizeJestCoverage = ( obj ) => {
+  const result = { ...obj };
+
+  Object
+    .entries( result )
+    .filter( ([k, v] ) => v.data )
+    .forEach( ([k, v] ) => {
+      result[k] = v.data;
+    });
+
+  return result;
+};
+
+const mergeAllReports = ( coverageMap, reports ) => {
+  if ( Array.isArray( reports ) === false ) {
+    return;
+  }
+
+  reports.forEach( reportFile => {
+    const coverageReport = fs.readJSONSync( reportFile );
+    coverageMap.merge( normalizeJestCoverage( coverageReport ) );
+  })
+};
+
+const findAllCoverageReports = ( path, callback ) => {
+  glob( path, {}, ( err, reports )=>{
+    callback( reports, err );
+  });
+};
+
+const generateReport = ( coverageMap, types ) => {
+  reporter.dir = reportOut;
+  reporter.addAll(types || ['html', 'text'] );
+  reporter.write( coverageMap );
+};
+
+async function main () {
+  const coverageMap = istanbulCoverage.createCoverageMap( {} );
+
+  findAllCoverageReports( rootDir + '/**/coverage-final.json', ( reports, err ) => {
+    if ( Array.isArray( reports ) ) {
+      mergeAllReports( coverageMap, reports );
+      generateReport( coverageMap, [ 'text' ]  )
+    }
+  });
+}
+
+main().catch(err => {
+  console.error(err);
+  process.exit(1);
+});