how to add javascript to visual studio code code example

Example 1: type checking js vscode

//type checking all js files (vscode)  

//in settings.json:
 "javascript.implicitProjectConfig.checkJs": true

//also gives you ability to enable TypeScript features like auto-import on save

Example 2: vs code enable "html" in "javascript"

"emmet.includeLanguages": {
    "javascript": "javascriptreact",
    "vue-html": "html",
    "razor": "html",
    "plaintext": "pug"
}