Updated the files.

my-app/node_modules/karma/lib/stopper.js

@@ -0,0 +1,69 @@
+const http = require('http')
+const cfg = require('./config')
+const logger = require('./logger')
+const helper = require('./helper')
+const { lookup } = require('./utils/dns-utils')
+
+exports.stop = function (cliOptionsOrConfig, done) {
+  cliOptionsOrConfig = cliOptionsOrConfig || {}
+  const log = logger.create('stopper')
+  done = helper.isFunction(done) ? done : process.exit
+
+  let config
+  if (cliOptionsOrConfig instanceof cfg.Config) {
+    config = cliOptionsOrConfig
+  } else {
+    logger.setupFromConfig({
+      colors: cliOptionsOrConfig.colors,
+      logLevel: cliOptionsOrConfig.logLevel
+    })
+    const deprecatedCliOptionsMessage =
+      'Passing raw CLI options to `stopper(config, done)` is deprecated. Use ' +
+      '`parseConfig(configFilePath, cliOptions, {promiseConfig: true, throwErrors: true})` ' +
+      'to prepare a processed `Config` instance and pass that as the ' +
+      '`config` argument instead.'
+    log.warn(deprecatedCliOptionsMessage)
+    try {
+      config = cfg.parseConfig(
+        cliOptionsOrConfig.configFile,
+        cliOptionsOrConfig,
+        {
+          promiseConfig: false,
+          throwErrors: true
+        }
+      )
+    } catch (parseConfigError) {
+      // TODO: change how `done` falls back to exit in next major version
+      //  SEE: https://github.com/karma-runner/karma/pull/3635#discussion_r565399378
+      done(1)
+    }
+  }
+
+  const request = http.request({
+    hostname: config.hostname,
+    path: config.urlRoot + 'stop',
+    port: config.port,
+    method: 'GET',
+    lookup
+  })
+
+  request.on('response', function (response) {
+    if (response.statusCode === 200) {
+      log.info('Server stopped.')
+      done(0)
+    } else {
+      log.error(`Server returned status code: ${response.statusCode}`)
+      done(1)
+    }
+  })
+
+  request.on('error', function (e) {
+    if (e.code === 'ECONNREFUSED') {
+      log.error(`There is no server listening on port ${config.port}`)
+      done(1, e.code)
+    } else {
+      throw e
+    }
+  })
+  request.end()
+}