chore: temporarily make it work

[ulivz]

Oh, such a great plugin! 👍

But I'm going to talk about a sad story.

This is a temporary workaround for that VuePress doesn't work when we import CommonJS module at client side:

const loadLanguages = require('prismjs/components/index') // A CommonJS module

This is a known weird issue, and I spent a lot of time on webpack and babel's repo to do research but couldn't find the answer, which caused us cannot share the same CommonJS format code on the server side and the client, so that VuePress had such a internal plugin for now 🙃:

https://github.com/vuejs/vuepress/blob/master/packages/%40vuepress/core/lib/internal-plugins/transformModule.js

I suspect that there is a problem with the babel configuration built into vuepress, but I haven't had time to continue the investigation. If you have any ideas, please let me know, thank you.

[codecov-io]

Codecov Report

Merging #1 into master will decrease coverage by 10.07%. The diff coverage is 63.15%.

@@             Coverage Diff             @@
##           master       #1       +/-   ##
===========================================
- Coverage   95.55%   85.48%   -10.08%     
===========================================
  Files          10       10               
  Lines          45       62       +17     
  Branches        6       14        +8     
===========================================
+ Hits           43       53       +10     
- Misses          2        9        +7

Impacted Files	Coverage Δ
lib/highlight.js	63.63% <63.15%> (-16.37%)	:arrow_down:

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