support for webpack5 entry descriptor in cli v5

[Hishengs]

Version

5.0.0-beta.4

Environment info

System:
    OS: macOS 11.2
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
Binaries:
    Node: 12.18.4 - ~/.nvm/versions/node/v12.18.4/bin/node
    Yarn: 1.19.1 - /usr/local/bin/yarn
    npm: 6.14.6 - ~/.nvm/versions/node/v12.18.4/bin/npm
  Browsers:
    Chrome: 94.0.4606.81
    Edge: Not Found
    Firefox: 92.0
    Safari: 14.0.3

Steps to reproduce

in my vue.config.js:

and iframeScriptEntry is like:

and in Service.js:313:31 we saw:

which did not consider situation for webpack5 entry descriptor

What is expected?

support for webpack5 entry descriptor in cli v5

What is actually happening?

error emit