@neosjs/cli/lib/create/template/base/build/utils.ts

Neos(奈欧斯)是一个帮助开发者快速地创建 Vue3 应用并自动配置项目编译的脚手架

export const wrapperEnv = (envConf: Recordable): ViteEnv => {
  const ret: any = {}
  for (const envName of Object.keys(envConf)) {
    let realName = envConf[envName].replace(/\\n/g, '\n')
    realName = realName === 'true' ? true : realName === 'false' ? false : realName

    if (envName === 'VITE_PORT') realName = Number(realName)
    if (envName === 'VITE_PROXY' && realName) {
      try {
        realName = JSON.parse(realName.replace(/'/g, '"'))
      } catch (error) {
        realName = ''
      }
    }
    ret[envName] = realName
    if (typeof realName === 'string') {
      process.env[envName] = realName
    } else if (typeof realName === 'object') {
      process.env[envName] = JSON.stringify(realName)
    }
  }
  return ret
}

export const formatDate = (date: Date, fmt: string) => {
  // 获取年份
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(
      RegExp.$1, //匹配到的结果yyyy，替换成后面的内容
      (date.getFullYear() + '').substr(4 - RegExp.$1.length) //(date.getFullYear() + "") 2019 + + "" 表示将数字转换成字符串
      //substr表示截取几位，假如传过来的是两位yy，就将2019截取4-2位成了19
    )
  }

  const o: any = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  }

  for (const k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      const str = o[k] + ''
      fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? str : padLeftZero(str))
    }
  }

  return fmt
}

function padLeftZero(str: string) {
  return ('00' + str).substr(str.length)
}