Create reference docs for client-side API

README.md

@@ -24,6 +24,7 @@
 - [Using Abilities](docs/4.using-abilities.md)
 - [REST API Reference](docs/5.rest-api.md)
 - [Hooks](docs/6.hooks.md)
+- [JavaScript/TypeScript Client](docs/7.javascript-client.md)
 - [Contributing Guidelines](CONTRIBUTING.md)
 
 ## Inspiration

docs/7.javascript-client.md

@@ -0,0 +1,179 @@
+# 7. JavaScript/TypeScript Client
+
+The JavaScript client provides an interface for discovering and executing WordPress Abilities from the browser.
+
+## Overview
+
+The JavaScript client enables frontend code to interact with the Abilities API system. It can:
+
+- Discover all registered abilities on your WordPress site
+- Execute server-side PHP abilities
+- Register and execute client-side JavaScript abilities
+
+You can read more about installation and setup in the [package readme](../packages/client/README.md).
+
+## Core API Functions
+
+### getAbilities()
+
+Returns an array of all registered abilities (both server-side and client-side).
+
+**Parameters:** None
+
+**Returns:** `Promise<Array>` - Array of ability objects
+
+**Example:**
+
+```javascript
+import { getAbilities } from `@wordpress/abilities`;
+
+const abilities = await getAbilities();
+console.log(`Found ${abilities.length} abilities`);
+
+// List all abilities
+abilities.forEach(ability => {
+    console.log(`${ability.name}: ${ability.description}`);
+});
+```
+
+### getAbility(name)
+
+Retrieves a specific ability by name.
+
+**Parameters:**
+- `name` (string) - The ability name (e.g., 'my-plugin/get-posts')
+
+**Returns:** `Promise<Object|null>` - The ability object or null if not found
+
+**Example:**
+
+```javascript
+const ability = await getAbility('my-plugin/get-site-info');
+if (ability) {
+    console.log('Label:', ability.label);
+    console.log('Description:', ability.description);
+    console.log('Input Schema:', ability.input_schema);
+}
+```
+
+### executeAbility(name, input)
+
+Executes an ability with the provided input data.
+
+**Parameters:**
+- `name` (string) - The ability name
+- `input` (any, optional) - Input data for the ability
+
+**Returns:** `Promise<any>` - The ability's output
+
+**Example:**
+
+```javascript
+// Execute without input
+const siteTitle = await executeAbility('my-plugin/get-site-title');
+console.log('Site:', siteTitle);
+
+// Execute with input parameters
+const posts = await executeAbility('my-plugin/get-posts', {
+    category: 'news',
+    limit: 5
+});
+posts.forEach(post => console.log(post.title));
+```
+
+### registerAbility(ability)
+
+Registers a client-side ability that runs in the browser.
+
+**Parameters:**
+- `ability` (object) - The ability configuration object
+
+**Returns:** `void`
+
+**Example:**
+
+```javascript
+// showNotification function
+const showNotification = (message) => {
+  new Notification(message);
+  return { success: true, displayed: message };
+}
+
+// Register a notification ability which calls the showNotification function
+registerAbility({
+    name: 'my-plugin/show-notification',
+    label: 'Show Notification',
+    description: 'Display a notification message to the user',
+    input_schema: {
+        type: 'object',
+        properties: {
+            message: { type: 'string' },
+            type: { type: 'string', enum: ['success', 'error', 'warning', 'info'] }
+        },
+        required: ['message']
+    },
+    callback: async ({ message, type = 'info' }) => {
+      // Show browser notification
+      if (!("Notification" in window)) {
+        alert("This browser does not support desktop notification");
+        return { success: false, error: 'Browser does not support notifications' };
+      }
+      if (Notification.permission !== 'granted') {
+        Notification.requestPermission().then((permission) => {
+          if (permission === "granted") {
+            return showNotification(message);
+          }
+        });
+      }
+      return showNotification(message);
+    },
+    permissionCallback: () => {
+        return !!wp.data.select('core').getCurrentUser();
+    }
+});
+
+// Use the registered ability
+const result = await executeAbility('my-plugin/show-notification', {
+    message: 'Hello World!',
+    type: 'success'
+});
+```
+
+### unregisterAbility(name)
+
+Removes a previously registered client-side ability.
+
+**Parameters:**
+- `name` (string) - The ability name to unregister
+
+**Example:**
+
+```javascript
+// Unregister an ability
+unregisterAbility('my-plugin/old-ability');
+```
+
+## Error Handling
+
+All functions return promises that may reject with specific error codes:
+
+```javascript
+try {
+    const result = await executeAbility('my-plugin/restricted-action', input);
+    console.log('Success:', result);
+} catch (error) {
+    switch (error.code) {
+        case 'ability_permission_denied':
+            console.error('Permission denied:', error.message);
+            break;
+        case 'ability_invalid_input':
+            console.error('Invalid input:', error.message);
+            break;
+        case 'rest_ability_not_found':
+            console.error('Ability not found:', error.message);
+            break;
+        default:
+            console.error('Execution failed:', error.message);
+    }
+}
+```