frontend/scripts/start.js

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = "development"
process.env.NODE_ENV = "development"

// 测试
process.env.BASE_URL = "http://test.marketapi.1688sup.com"
process.env.UNIFIED_API = "http://api.test.user.1688sup.com/v1"
process.env.UNIFIED_URL = "http://test.user.1688sup.com/#/login"

// 镜像
// process.env.BASE_URL = "http://pre.marketapi.1688sup.com"
// process.env.UNIFIED_API = "http://api.gray.user.1688sup.com/v1"
// process.env.UNIFIED_URL = "http://gray.user.1688sup.com/#/login"

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on("unhandledRejection", (err) => {
  throw err
})

// Ensure environment variables are read.
require("../config/env")

const fs = require("fs")
const chalk = require("react-dev-utils/chalk")
const webpack = require("webpack")
const WebpackDevServer = require("webpack-dev-server")
const clearConsole = require("react-dev-utils/clearConsole")
const checkRequiredFiles = require("react-dev-utils/checkRequiredFiles")
const {
  choosePort,
  createCompiler,
  prepareProxy,
  prepareUrls
} = require("react-dev-utils/WebpackDevServerUtils")
const openBrowser = require("react-dev-utils/openBrowser")
const semver = require("semver")
const paths = require("../config/paths")
const configFactory = require("../config/webpack.config")
const createDevServerConfig = require("../config/webpackDevServer.config")
const getClientEnvironment = require("../config/env")
const react = require(require.resolve("react", { paths: [paths.appPath] }))

const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1))
const useYarn = fs.existsSync(paths.yarnLockFile)
const isInteractive = process.stdout.isTTY

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
  process.exit(1)
}

// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000
const HOST = process.env.HOST || "0.0.0.0"

if (process.env.HOST) {
  console.log(
    chalk.cyan(
      `Attempting to bind to HOST environment variable: ${chalk.yellow(
        chalk.bold(process.env.HOST)
      )}`
    )
  )
  console.log(`If this was unintentional, check that you haven't mistakenly set it in your shell.`)
  console.log(`Learn more here: ${chalk.yellow("https://cra.link/advanced-config")}`)
  console.log()
}

// We require that you explicitly set browsers and do not fall back to
// browserslist defaults.
const { checkBrowsers } = require("react-dev-utils/browsersHelper")
checkBrowsers(paths.appPath, isInteractive)
  .then(() => {
    // We attempt to use the default port but if it is busy, we offer the user to
    // run on a different port. `choosePort()` Promise resolves to the next free port.
    return choosePort(HOST, DEFAULT_PORT)
  })
  .then((port) => {
    if (port == null) {
      // We have not found a port.
      return
    }

    const config = configFactory("development")
    const protocol = process.env.HTTPS === "true" ? "https" : "http"
    const appName = require(paths.appPackageJson).name

    const useTypeScript = fs.existsSync(paths.appTsConfig)
    const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === "true"
    const urls = prepareUrls(protocol, HOST, port, paths.publicUrlOrPath.slice(0, -1))
    const devSocket = {
      warnings: (warnings) => devServer.sockWrite(devServer.sockets, "warnings", warnings),
      errors: (errors) => devServer.sockWrite(devServer.sockets, "errors", errors)
    }
    // Create a webpack compiler that is configured with custom messages.
    const compiler = createCompiler({
      appName,
      config,
      devSocket,
      urls,
      useYarn,
      useTypeScript,
      tscCompileOnError,
      webpack
    })
    // Load proxy config
    const proxySetting = require(paths.appPackageJson).proxy
    const proxyConfig = prepareProxy(proxySetting, paths.appPublic, paths.publicUrlOrPath)
    // Serve webpack assets generated by the compiler over a web server.
    const serverConfig = createDevServerConfig(proxyConfig, urls.lanUrlForConfig)
    const devServer = new WebpackDevServer(compiler, serverConfig)
    // Launch WebpackDevServer.
    devServer.listen(port, HOST, (err) => {
      if (err) {
        return console.log(err)
      }
      if (isInteractive) {
        clearConsole()
      }

      if (env.raw.FAST_REFRESH && semver.lt(react.version, "16.10.0")) {
        console.log(
          chalk.yellow(
            `Fast Refresh requires React 16.10 or higher. You are using React ${react.version}.`
          )
        )
      }

      console.log(chalk.cyan("Starting the development server...\n"))
      openBrowser(urls.localUrlForBrowser)
    })
    ;["SIGINT", "SIGTERM"].forEach(function (sig) {
      process.on(sig, function () {
        devServer.close()
        process.exit()
      })
    })

    if (process.env.CI !== "true") {
      // Gracefully exit when stdin ends
      process.stdin.on("end", function () {
        devServer.close()
        process.exit()
      })
    }
  })
  .catch((err) => {
    if (err && err.message) {
      console.log(err.message)
    }
    process.exit(1)
  })