merge-coverage-reports.js

#!/usr/bin/env node

const path = require('path');
const { spawnSync } = require('child_process');

const rimraf = require('rimraf');
const makeDir = require('make-dir');
const glob = require('glob');

process.chdir(__dirname);
rimraf.sync('.nyc_output');
makeDir.sync('.nyc_output');
// Merge coverage data from each package so we can generate a complete report
glob.sync('modules/*/.nyc_output').forEach((nycOutput) => {
  const cwd = path.dirname(nycOutput);
  const { status, stderr } = spawnSync(
    'yarn',
    ['nyc', 'merge', '.nyc_output', path.join(__dirname, '.nyc_output', path.basename(cwd) + '.json')],
    {
      encoding: 'utf8',
      shell: true,
      cwd,
    }
  );

  if (status !== 0) {
    console.error(stderr);
    process.exit(status);
  }
});