feat: mark as tree-shakable

[danielkov]

What / Why?

• Marks package as tree-shakable, instructing compilers that they can remove unused parts
• The intended effect is to reduce bundle size for parts that are unused

Warning

This depends on the package being side-effect-free. Tested on speakeasy-registry.

[cursor]

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[cursor]

Bug: CSS Exports Require sideEffects: true

Setting sideEffects: false in package.json is incorrect for a package that exports CSS files. CSS imports have global side effects, so bundlers may incorrectly tree-shake them, potentially causing missing styles in production builds.

 

[danielkov]

I was also concerned by this, but based on our usage and the README:

### 2. Configure Tailwind CSS

Add this to the top of your project's CSS file where you configure Tailwind:

```css
/* This must come BEFORE your Tailwind imports */
@reference "../node_modules/@speakeasy-api/moonshine/src/global.css";

We shouldn't depend on CSS-injection from JS.

Also possible to do "sideEffects": ["*.css"].