Vant Cli 自建组件库 https://www.npmjs.com/package/@vant/cli
添加ts支持 yarn add --dev @types/node typescript ts-loader yarn run tsc --init
新增 tsconfig.declaration.json 修改 tsconfig.json
参考： https://www.wenjiangs.com/article/vant-cli.html#7caa43b640145478acb68234b3872692 https://github.com/youzan/vant/blob/dev/packages/vant/tsconfig.declaration.json