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client-side-js

Skill

Use when a val needs to ship JavaScript that runs in the browser — React apps, vanilla DOM scripts, canvas/games, htmx/Alpine, or any client-side module beyond a single inline snippet. Explains how Val Town serves transpiled .ts/.tsx/.jsx modules with no build step, how the browser resolves their im

0Frontend

Install

git clone https://github.com/val-town/plugins.git ~/.claude/skills/client-side-js

What is client-side-js?

Use when a val needs to ship JavaScript that runs in the browser — React apps, vanilla DOM scripts, canvas/games, htmx/Alpine, or any client-side module beyond a single inline snippet. Explains how Val Town serves transpiled .ts/.tsx/.jsx modules with no build step, how the browser resolves their imports, and how to load third-party deps.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~85 tokens of context used while enabled, before you invoke anything

Documentation

README · ~3 min read

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 <script type="module"> 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.

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