vue-cli 3.0 vue-cli-service.js解读

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#!/usr/bin/env node

const semver = require('semver')
const { error } = require('@vue/cli-shared-utils')
const requiredVersion = require('../package.json').engines.node

if (!semver.satisfies(process.version, requiredVersion)) {
  error(
    `You are using Node ${process.version}, but vue-cli-service ` +
    `requires Node ${requiredVersion}.\nPlease upgrade your Node version.`
  )
  process.exit(1)
}

const Service = require('../lib/Service')
const service = new Service(process.env.VUE_CLI_CONTEXT || process.cwd()) // 传入当前项目的所在路径 /Users/zyn/WebRoot/Demo/uiit-test

const rawArgv = process.argv.slice(2) // [ 'serve' ] [ 'serve', '--port', '3000' ]
// minimist 命令行参数解析器
const args = require('minimist')(rawArgv, {
  boolean: [
    // build
    'modern',
    'report',
    'report-json',
    'watch',
    // serve
    'open',
    'copy',
    'https',
    // inspect
    'verbose'
  ]
})  // vue-cli-service serve --port 3000  args 包含 {port: 3000}
const command = args._[0] // serve

service.run(command, args, rawArgv).catch(err => {
  error(err)
  process.exit(1)
})