@servlyadmin/runtime-core

@servlyadmin/runtime-core

Framework-agnostic core renderer for Servly components. This package provides the foundation for rendering Servly components in any JavaScript environment.

Installation

npm install @servlyadmin/runtime-core
# or
yarn add @servlyadmin/runtime-core
# or
pnpm add @servlyadmin/runtime-core

Quick Start

import { render, fetchComponent } from '@servlyadmin/runtime-core';

// Fetch a component from the registry (uses Servly's default registry)
const { data } = await fetchComponent('my-component-id');

// Render to a container
const result = render({
  container: document.getElementById('app'),
  elements: data.layout,
  context: {
    props: { title: 'Hello World' },
    state: {},
    context: {},
  },
});

// Update props
result.update({
  props: { title: 'Updated Title' },
  state: {},
  context: {},
});

// Cleanup
result.destroy();

Registry Configuration

By default, components are fetched from Servly's production registry:

• Default URL: https://core-api.servly.app/v1/views/registry

You can override this if you have a custom registry:

import { setRegistryUrl } from '@servlyadmin/runtime-core';

// Use a custom registry
setRegistryUrl('https://your-api.com/v1/views/registry');

Cache Strategies

The runtime supports three caching strategies to optimize component loading:

Strategy	Description	Persistence	Best For
localStorage	Persists across browser sessions	Yes	Production apps (default)
memory	In-memory cache, cleared on page refresh	No	Development, SSR
none	No caching, always fetches fresh	No	Testing, debugging

Default: localStorage - Components are cached in the browser's localStorage for fast subsequent loads.

// Use default localStorage caching
const { data } = await fetchComponent('my-component');

// Explicitly set cache strategy
const { data } = await fetchComponent('my-component', {
  cacheStrategy: 'memory',  // or 'localStorage' or 'none'
});

// Force refresh (bypass cache)
const { data } = await fetchComponent('my-component', {
  forceRefresh: true,
});

Core Concepts

Layout Elements

Components are defined as a tree of layout elements:

interface LayoutElement {
  i: string;           // Unique identifier
  componentId: string; // Element type (container, text, button, etc.)
  configuration?: {    // Element configuration
    classNames?: string;
    style?: Record<string, any>;
    text?: string;
    // ... other attributes
  };
  children?: string[]; // Child element IDs
  parent?: string;     // Parent element ID
}

Binding Context

Data is passed to components through a binding context:

interface BindingContext {
  props: Record<string, any>;   // Component props
  state: Record<string, any>;   // Component state
  context: Record<string, any>; // Additional context
}

Template Bindings

Use {{path}} syntax to bind data:

const elements = [
  {
    i: 'greeting',
    componentId: 'text',
    configuration: {
      text: 'Hello, {{props.name}}!',
      classNames: '{{props.className}}',
    },
  },
];

API Reference

render(options)

Renders elements to a container.

const result = render({
  container: HTMLElement,
  elements: LayoutElement[],
  context: BindingContext,
  eventHandlers?: Record<string, Record<string, (e: Event) => void>>,
});

// Returns
interface RenderResult {
  update(context: BindingContext): void;
  destroy(): void;
  getElement(id: string): HTMLElement | null;
}

fetchComponent(id, options?)

Fetches a component from the registry.

const { data, fromCache, version } = await fetchComponent('component-id', {
  version: 'latest',           // Version specifier (default: 'latest')
  cacheStrategy: 'localStorage', // 'localStorage' | 'memory' | 'none' (default: 'localStorage')
  forceRefresh: false,         // Bypass cache (default: false)
  retryConfig: {
    maxRetries: 3,             // Number of retry attempts (default: 3)
    initialDelay: 1000,        // Initial retry delay in ms (default: 1000)
    maxDelay: 10000,           // Maximum retry delay in ms (default: 10000)
    backoffMultiplier: 2,      // Exponential backoff multiplier (default: 2)
  },
});

setRegistryUrl(url)

Configure a custom registry URL.

import { setRegistryUrl, DEFAULT_REGISTRY_URL } from '@servlyadmin/runtime-core';

// Use custom registry
setRegistryUrl('https://your-api.com/v1/views/registry');

// Reset to default
setRegistryUrl(DEFAULT_REGISTRY_URL);

StateManager

Manages component state with subscriptions.

import { StateManager } from '@servlyadmin/runtime-core';

const stateManager = new StateManager({ count: 0 });

// Get/set state
stateManager.set('count', 1);
stateManager.get('count'); // 1
stateManager.set('user.name', 'John');

// Subscribe to changes
const unsubscribe = stateManager.subscribe((event) => {
  console.log('State changed:', event.path, event.value);
});

// Cleanup
stateManager.clear();

EventSystem

Handles events with plugin-based actions.

import { EventSystem, getEventSystem } from '@servlyadmin/runtime-core';

const eventSystem = getEventSystem();

// Register custom plugin
eventSystem.registerPlugin('my-action', async (action, context) => {
  console.log('Action executed with:', action.config);
});

Built-in Plugins

• executeCode - Execute arbitrary JavaScript code
• state-setState - Update state values
• navigateTo - Navigate to URL
• localStorage-set/get/remove - LocalStorage operations
• sessionStorage-set/get - SessionStorage operations
• alert - Show alert dialog
• console-log - Log to console
• clipboard-copy - Copy text to clipboard
• scrollTo - Scroll to element
• focus/blur - Focus/blur elements
• addClass/removeClass/toggleClass - CSS class manipulation
• setAttribute/removeAttribute - Attribute manipulation
• dispatchEvent - Dispatch custom events
• delay - Add delay between actions

Cache Management

import { 
  clearAllCaches, 
  clearMemoryCache, 
  clearLocalStorageCache,
  getMemoryCacheSize 
} from '@servlyadmin/runtime-core';

// Clear all caches
clearAllCaches();

// Clear specific cache
clearMemoryCache();
clearLocalStorageCache();

// Get cache size
const size = getMemoryCacheSize();

Bindings

Template resolution utilities.

import { resolveTemplate, hasTemplateSyntax } from '@servlyadmin/runtime-core';

const context = {
  props: { name: 'World', count: 42 },
  state: {},
  context: {},
};

// Resolve single template
resolveTemplate('Hello, {{props.name}}!', context); // "Hello, World!"

// Check if string has template syntax
hasTemplateSyntax('{{props.name}}'); // true
hasTemplateSyntax('static text');    // false

Slots

Components can define slots for content injection:

const elements = [
  {
    i: 'card',
    componentId: 'container',
    configuration: { classNames: 'card' },
    children: ['header-slot', 'content-slot'],
  },
  {
    i: 'header-slot',
    componentId: 'slot',
    configuration: {
      slotName: 'header',
    },
    parent: 'card',
  },
  {
    i: 'content-slot',
    componentId: 'slot',
    configuration: {
      slotName: 'default',
    },
    parent: 'card',
  },
];

Framework wrappers handle slot content injection automatically.

TypeScript Support

Full TypeScript support with exported types:

import type {
  LayoutElement,
  BindingContext,
  RenderResult,
  RenderOptions,
  ComponentData,
  CacheStrategy,
  RetryConfig,
  FetchOptions,
  FetchResult,
} from '@servlyadmin/runtime-core';

Browser Support

• Chrome 80+
• Firefox 75+
• Safari 13+
• Edge 80+

License

MIT