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Creating Custom Plugins ​

There are two main ways to expose a plugin's functionality: Static/Manual Imports (cleaner for large projects) or Global/Automatic Window Injection (easier for quick scripts and global helpers).

1. The Anatomy of a Plugin ​

A plugin is a standard JavaScript function. By convention, if a plugin adds a global helper or component, it should be prefixed with an underscore (_).

javascript
// plugins/my-utils.js
export const MyUtils = ($) => {
  
  // 1. Attach to the SigPro instance
  $.capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1);

  // 2. Attach to the Window (Global access)
  window._hello = (name) => div(\`Hello, \${$.capitalize(name)}!\`);
  
  // 3. You can also return values if needed
  return { version: '1.0.0' };
};

2. Integration Strategies ​

This approach keeps your global namespace clean. You import the logic only where you need it, but the plugin still initializes the core $ extensions.

javascript
// main.js
import { $ } from 'sigpro';
import { MyUtils } from './plugins/my-utils.js';

$.plugin(MyUtils);

// App.js
export default () => {
  const name = "sigpro";
  // $.capitalize was added by the plugin
  return h1($.capitalize(name)); 
};

Option B: Automatic Window Injection ​

If your plugin defines global tags (like _button or _hello), you should attach them to the window object inside the plugin function. This makes them available everywhere without imports.

javascript
// plugins/theme.js
export const Theme = ($) => {
  const $dark = $(false);

  window._themeToggle = () => button({
    onclick: () => $dark(v => !v),
    class: () => $dark() ? 'bg-black text-white' : 'bg-white text-black'
  }, "Toggle Mode");
};

// main.js
$.plugin(Theme).then(() => {
   // _themeToggle is now a global function
   $.mount(App);
});

3. Asynchronous Plugins ​

If your plugin needs to load external data or scripts before the app starts, make it async. SigPro will wait for it.

javascript
export const ConfigLoader = async ($) => {
  const res = await fetch('/config.json');
  const config = await res.json();
  
  $.config = config; // Attach loaded config to SigPro
};

// Usage
$.plugin(ConfigLoader).then(() => {
  console.log("Config loaded:", $.config);
  $.mount(App);
});

4. Best Practices for Plugin Authors ​

RuleDescription
PrefixingUse _ for UI components (_modal) and $. for logic ($.fetch).
IdempotencyEnsure calling $.plugin(MyPlugin) twice doesn't break the app.
EncapsulationUse the $ instance passed as an argument rather than importing it again inside the plugin.
ReactivityAlways use $(...) for internal state so the app stays reactive.

5. Installation ​

Custom plugins don't require extra packages, but ensure your build tool (Vite/Bun) is configured to handle the module imports.

bash
npm install sigpro
bash
pnpm add sigpro
bash
yarn add sigpro
bash
bun add sigpro
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