client-side-js

From README

Client-side JavaScript Val Town has no build step and no bundler. A client-side module is just a file in your val that you serve over HTTP; Val Town transpiles it per request. You point a at a route that returns the file, and the browser runs it. There is nothing to configure (no webpack/vite/esbuild). Serving a module serveFile from std/utils reads a file and serves it with the correct Content-Type. For .ts, .tsx, and .jsx it transpiles to JavaScript — strips types, compiles JSX — and serves text/javascript. You serve the source file; the browser receives runnable JS. Then load it from your HTML: The path you serve at and the file's location are up to you. A common shortcut is a wildcard that serves a whole directory of modules and assets: serveFile defaults to the current val. If you call it from a non-entrypoint file and paths don't resolve, pass import.meta.url as the second argument.