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node_modules/nyc/lib/commands/merge.js

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+'use strict'
+const path = require('path')
+const makeDir = require('make-dir')
+const fs = require('../fs-promises')
+const { cliWrapper, setupOptions } = require('./helpers.js')
+
+const NYC = require('../../index.js')
+
+exports.command = 'merge <input-directory> [output-file]'
+
+exports.describe = 'merge istanbul format coverage output in a given folder'
+
+exports.builder = function (yargs) {
+  yargs
+    .demandCommand(0, 0)
+    .example('$0 merge ./out coverage.json', 'merge together reports in ./out and output as coverage.json')
+    .positional('input-directory', {
+      describe: 'directory containing multiple istanbul coverage files',
+      type: 'text',
+      default: './.nyc_output'
+    })
+    .positional('output-file', {
+      describe: 'file to output combined istanbul format coverage to',
+      type: 'text',
+      default: 'coverage.json'
+    })
+
+  setupOptions(yargs, 'merge')
+  yargs.default('exclude-after-remap', false)
+}
+
+exports.handler = cliWrapper(async argv => {
+  process.env.NYC_CWD = process.cwd()
+  const nyc = new NYC(argv)
+  const inputStat = await fs.stat(argv.inputDirectory).catch(error => {
+    throw new Error(`failed access input directory ${argv.inputDirectory} with error:\n\n${error.message}`)
+  })
+
+  if (!inputStat.isDirectory()) {
+    throw new Error(`${argv.inputDirectory} was not a directory`)
+  }
+  await makeDir(path.dirname(argv.outputFile))
+  const map = await nyc.getCoverageMapFromAllCoverageFiles(argv.inputDirectory)
+  await fs.writeFile(argv.outputFile, JSON.stringify(map, null, 2), 'utf8')
+  console.info(`coverage files in ${argv.inputDirectory} merged into ${argv.outputFile}`)
+})