vue-cli4升级vue-cli5打包的时候遇到一个报错：

ERROR  Failed to compile with 2 errors

error  in ./node_modules/canvg/lib/index.es.js

export 'default' (imported as '_asyncToGenerator') was not found in '@babel/runtime/helpers/asyncToGenerator' (module has no exports)

error  in ./node_modules/canvg/lib/index.es.js

export 'default' (imported as '_defineProperty') was not found in '@babel/runtime/helpers/defineProperty' (module has no exports)

ERROR  Error: Build failed with errors.

解决方案：在vue.config.js 中配置 transpileDependencies

module.exports = {
  transpileDependencies: ['canvg']
}

原因：