vue cli uses prism with apollo-server for code highlight look at these files: [highlight.js](https://github.com/vuejs/vue-cli/blob/4acf48da1082d42dcfeb58ddac15ace3bc3182e6/packages/%40vue/cli-ui/apollo-server/util/highlight.js) [git.js](https://github.com/vuejs/vue-cli/blob/4acf48da1082d42dcfeb58ddac15ace3bc3182e6/packages/%40vue/cli-ui/apollo-server/connectors/git.js) [main.styl](https://github.com/vuejs/vue-cli/blob/a09407dd5b9f18ace7501ddb603b95e31d6d93c0/packages/%40vue/cli-ui/src/style/main.styl)
vue cli uses prism with apollo-server for code highlight
look at these files:
highlight.js
git.js
main.styl