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241 lines
7.4 KiB
Markdown
241 lines
7.4 KiB
Markdown
# SigPro – Complete API Reference
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## Core Reactivity
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### `$(value, localStorageKey?)` – Signal & Computed
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Creates a reactive signal. If a function is passed, it becomes a **computed** signal that caches its result until dependencies change.
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| Usage | Description |
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|-------|-------------|
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| `const count = $(0)` | Basic signal, returns a getter/setter: `count()` reads, `count(5)` writes. |
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| `const double = $( () => count() * 2 )` | Computed signal – updates automatically when `count` changes. |
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| `const stored = $('hello', 'myKey')` | Persisted signal – reads/writes to `localStorage`. |
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**Example**
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```javascript
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const count = $(0)
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const double = $( () => count() * 2 )
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watch(() => {
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console.log(`count = ${count()}, double = ${double()}`)
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}) // logs on every change
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count(5) // triggers log: count=5, double=10
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```
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---
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### `$$(object)` – Deep Reactive Proxy
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Makes a plain object (and all nested objects) deeply reactive. Any property access is tracked, any mutation triggers updates.
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```javascript
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const state = $$({ user: { name: 'Alice', age: 30 }, items: [1,2,3] })
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watch(() => {
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console.log(state.user.name) // tracks `user.name`
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})
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state.user.name = 'Bob' // triggers the effect
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```
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> **Note**: `$$` caches proxies per original object, so calling `$$` multiple times on the same object returns the same proxy.
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---
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### `watch(source, callback?)` – Reactive Effect
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Two modes:
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1. **Auto‑track mode** – pass a function: `watch(() => { /* reads signals */ })`
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Automatically re‑runs whenever any signal read inside changes.
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2. **Explicit mode** – pass an array of signals and a callback:
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`watch([count, double], () => { ... })`
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Runs the callback when any of the listed signals change. The callback receives the new values.
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Both modes return a `stop` function that disposes the effect.
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```javascript
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// auto mode
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const stop = watch(() => console.log(count()))
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// explicit mode
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watch([count, double], ([newCount, newDouble]) => {
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console.log(newCount, newDouble)
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})
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```
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> **Important**: Effects are depth‑aware – they run in topological order, parents before children.
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---
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## Components & DOM (Hyperscript)
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### `h(tag, props, children)` – Create DOM Nodes
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The universal builder. `props` can be omitted. Children can be strings, numbers, nodes, arrays, or **dynamic functions**.
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| Feature | Example |
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|---------|---------|
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| Standard attributes | `h('div', { class: 'box', id: 'main' })` |
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| Events | `onClick: (e) => ...` (automatically cleaned up) |
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| Reactive attributes | `class: () => count() > 0 ? 'positive' : 'negative'` |
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| Two‑way binding | `value: mySignal` (works on `input`, `textarea`, `select`) |
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| Refs | `ref: (el) => ...` or `ref: { current: null }` |
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| SVG support | tag names like `svg`, `circle`, `path` – sets correct namespace |
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| Dangerous URL sanitising | `href` / `src` with `javascript:` or `data:` are blocked → `'#'` (when XSS shield is active) |
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**Dynamic children** – pass a function as a child, it will be re‑executed and the DOM patched automatically:
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```javascript
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h('div', {}, [
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() => count() > 0 ? h('span', {}, 'positive') : h('span', {}, 'zero or negative')
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])
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```
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### Tag shortcuts
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Tag helpers are **not exported individually** from the core. To use them globally without the `h(...)` wrapper, activate the side‑effect module:
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```javascript
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import "sigpro"
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// You can now write:
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div({ class: 'container' }, [
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h1({}, 'Title'),
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button({ onClick: () => alert('hi') }, 'Click me')
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])
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```
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In the **IIFE bundle** (`sigpro.min.js`), the helpers are already injected globally – no import needed.
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Available tags: `a`, `abbr`, `article`, `aside`, `audio`, `b`, `blockquote`, `br`, `button`, `canvas`, `caption`, `cite`, `code`, `col`, `colgroup`, `datalist`, `dd`, `del`, `details`, `dfn`, `dialog`, `div`, `dl`, `dt`, `em`, `embed`, `fieldset`, `figcaption`, `figure`, `footer`, `form`, `h1`…`h6`, `header`, `hr`, `i`, `iframe`, `img`, `input`, `ins`, `kbd`, `label`, `legend`, `li`, `main`, `mark`, `meter`, `nav`, `object`, `ol`, `optgroup`, `option`, `output`, `p`, `picture`, `pre`, `progress`, `section`, `select`, `slot`, `small`, `source`, `span`, `strong`, `sub`, `summary`, `sup`, `svg`, `table`, `tbody`, `td`, `template`, `textarea`, `tfoot`, `th`, `thead`, `time`, `tr`, `u`, `ul`, `video`.
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---
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## Flow Control Components
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### `when(condition, thenComponent, elseComponent?)`
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Reactive conditional rendering. `condition` can be a boolean, a signal, or any function that returns a boolean. Both branches can be `Node`, `() => Node`, or `null`. Automatically disposes the unmounted branch.
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```javascript
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when(
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() => user.loggedIn(),
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() => div({}, 'Welcome back!'),
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() => button({ onClick: () => login() }, 'Login')
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)
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```
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---
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### `each(source, itemRenderer, keyFn)`
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Optimised keyed list rendering. `source` can be an array or a signal/function returning an array. `itemRenderer(item, index)` returns a Node (or a function that returns Nodes). `keyFn(item, index)` returns a unique identifier – **required** for efficient DOM reuse.
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```javascript
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const items = $([{ id: 1, text: 'a' }, { id: 2, text: 'b' }])
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each(items,
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(item) => Li({}, item.text),
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(item) => item.id
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)
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```
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When the array changes, elements are added, removed, or reordered with minimal DOM operations.
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---
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## Batch
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### `batch(fn)`
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Batch multiple reactive updates into a single flush, improving performance.
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```javascript
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batch(() => {
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count(1)
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name('John')
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// effects run only once after the batch ends
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})
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```
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---
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## Router – `router(routes)`
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Hash‑based SPA router. Returns a DOM node that renders the current route.
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```javascript
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import { router } from 'sigpro'
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const routes = [
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{ path: '/', component: () => div({}, 'Home') },
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{ path: '/user/:id', component: (params) => div({}, `User ${params.id}`) },
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{ path: '*', component: () => div({}, '404') }
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]
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const App = () => div({}, [
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a({ href: '#/' }, 'Home'),
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a({ href: '#/user/42' }, 'User 42'),
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router(routes)
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])
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```
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**API**
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| Method | Description |
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|--------|-------------|
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| `router.params()` | Returns a reactive signal of current route params (e.g., `{ id: '42' }`). |
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| `router.to(path)` | Navigate to a new hash (e.g., `router.to('/user/5')`). Prepend `#` automatically. |
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| `router.back()` | Go back in history. |
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| `router.path()` | Returns current hash path without `#` (e.g., `/user/42`). |
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---
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## Mounting – `mount(component, target)`
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Clears the target element and mounts the application. Returns the runtime instance (which has a `.destroy()` method).
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```javascript
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mount(() => App(), '#app')
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// or
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mount(App, document.body)
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```
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If you mount again on the same target, the previous instance is automatically destroyed.
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---
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## Global Cleanup & Memory
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SigPro tracks every effect, DOM event listener, and nested component. When a component is unmounted:
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- All its effects are disposed.
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- All DOM event listeners are removed.
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- All `onUnmount` callbacks run.
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- Child components are recursively destroyed.
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You never need to manually clean up – just write reactive code.
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---
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## Full Example – Counter with Persistence
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```javascript
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import 'sigpro';
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const count = $(0, 'counter') // persists in localStorage
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const App = () =>
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div({ class: 'counter' }, [
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h1({}, () => `Count: ${count()}`),
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button({ onClick: () => count(count() + 1) }, '+'),
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button({ onClick: () => count(count() - 1) }, '-'),
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button({ onClick: () => count(0) }, 'Reset')
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])
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mount(App, '#app')
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```
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