src/third_party/devtools/node_modules/karma/lib/reporters/progress.js

const BaseReporter = require('./base')

function ProgressReporter (formatError, reportSlow, useColors, browserConsoleLogOptions) {
  BaseReporter.call(this, formatError, reportSlow, useColors, browserConsoleLogOptions)

  this.EXCLUSIVELY_USE_COLORS = false
  this._browsers = []

  this.writeCommonMsg = function (msg) {
    this.write(this._remove() + msg + this._render())
  }

  this.specSuccess = function () {
    this.write(this._refresh())
  }

  this.onBrowserComplete = function () {
    this.write(this._refresh())
  }

  this.onRunStart = function () {
    this._browsers = []
    this._isRendered = false
  }

  this.onBrowserStart = function (browser) {
    this._browsers.push(browser)

    if (this._isRendered) {
      this.write('\n')
    }

    this.write(this._refresh())
  }

  this._remove = function () {
    if (!this._isRendered) {
      return ''
    }

    let cmd = ''
    this._browsers.forEach(function () {
      cmd += '\x1B[1A' + '\x1B[2K'
    })

    this._isRendered = false

    return cmd
  }

  this._render = function () {
    this._isRendered = true

    return this._browsers.map(this.renderBrowser).join('\n') + '\n'
  }

  this._refresh = function () {
    return this._remove() + this._render()
  }
}

// PUBLISH
module.exports = ProgressReporter