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* Next.js integration for Coherent.js
* Provides utilities for using Coherent.js with Next.js
*/
import {
render,
performanceMonitor,
renderComponentFactory
} from '@coherent.js/core';
function missingPeer(packageName, integrationName, cause) {
const error = new Error(
`${integrationName} requires the '${packageName}' package to be installed.\n` +
`Please install it with: npm install ${packageName} (or pnpm add / yarn add)`
);
error.cause = cause;
return error;
}
/**
* The React module to build elements with.
*
* An injected `options.React` wins. Otherwise React is imported from *this*
* package: it declares `react` as an optional peer, so package managers link
* the app's copy next to it. (core's `importPeerDependency` imports relative
* to @coherent.js/core instead, which cannot see the app's `react` under
* pnpm's isolated layout.) The literal specifier keeps it bundler-friendly.
*
* @param {Object} [injected] - A React module or namespace supplied by the app
* @param {string} integrationName - Used in the error message
* @returns {Promise<Object>} Object exposing createElement / useState / useEffect
*/
async function loadReact(injected, integrationName) {
let mod = injected;
if (!mod) {
try {
mod = await import('react');
} catch (_error) {
throw missingPeer('react', integrationName, _error);
}
}
// Namespace imports of CommonJS React carry the API on `default`.
return typeof mod.createElement === 'function' ? mod : mod.default;
}
/**
* Create a Next.js API route handler for Coherent.js components
*
* @param {Function} componentFactory - Function that returns a Coherent.js component
* @param {Object} options - Handler options
* @param {boolean} options.enablePerformanceMonitoring - Enable performance monitoring
* @param {string} options.template - HTML template with {{content}} placeholder
* @returns {Function} Next.js API route handler
*/
export function createCoherentNextHandler(componentFactory, options = {}) {
return async (req, res) => {
try {
// Use shared rendering utility
const finalHtml = await renderComponentFactory(
componentFactory,
[req, res],
options
);
// Send HTML response
res.setHeader('Content-Type', 'text/html; charset=utf-8');
res.status(200).send(finalHtml);
} catch (_error) {
console.error('Coherent.js Next.js handler error:', _error);
res.status(500).json({ error: _error.message });
}
};
}
/**
* Create a Next.js App Router route handler for Coherent.js components
*
* The factory receives the same `(request, context)` pair Next.js passes to
* route handlers, so dynamic segments are available as `context.params`
* (a Promise since Next.js 15).
*
* @param {Function} componentFactory - `(request, context) => component`
* @param {Object} options - Handler options
* @returns {Function} Next.js App Router route handler
*/
export function createCoherentAppRouterHandler(componentFactory, options = {}) {
return async function handler(request, context) {
try {
// Use shared rendering utility
const finalHtml = await renderComponentFactory(
componentFactory,
[request, context],
options
);
// Send HTML response
return new Response(finalHtml, {
status: 200,
headers: { 'Content-Type': 'text/html; charset=utf-8' }
});
} catch (_error) {
console.error('Coherent.js Next.js App Router handler error:', _error);
return new Response(
JSON.stringify({ error: _error.message }),
{
status: 500,
headers: { 'Content-Type': 'application/json' }
}
);
}
}
}
/**
* Create a Next.js Server Component for Coherent.js
*
* @param {Function} componentFactory - Function that returns a Coherent.js component
* @param {Object} options - Component options
* @param {boolean} [options.enablePerformanceMonitoring=false] - Enable performance monitoring
* @param {Object} [options.React] - React module to use instead of importing `react`
* @returns {Promise<Function>} Next.js Server Component
*/
export async function createCoherentServerComponent(componentFactory, options = {}) {
const {
enablePerformanceMonitoring = false
} = options;
const React = await loadReact(options.React, 'Next.js Server Component integration');
return async function CoherentServerComponent(props) {
try {
// Create component with props
const component = await Promise.resolve(
componentFactory(props)
);
Iif (!component) {
return React.createElement('div', null, 'Error: Component factory returned null/undefined');
}
// Render component
let html;
Iif (enablePerformanceMonitoring) {
const renderId = performanceMonitor.startRender();
html = render(component);
performanceMonitor.endRender(renderId);
} else {
html = render(component);
}
// Return dangerouslySetInnerHTML to render HTML
return React.createElement('div', {
dangerouslySetInnerHTML: { __html: html }
});
} catch (_error) {
console.error('Coherent.js Next.js Server Component error:', _error);
return React.createElement('div', null, `Error: ${_error.message}`);
}
};
}
/**
* Create a Next.js Client Component for Coherent.js with hydration support
*
* @param {Function} componentFactory - Function that returns a Coherent.js component
* @param {Object} options - Component options
* @param {boolean} [options.enablePerformanceMonitoring=false] - Enable performance monitoring
* @param {Object} [options.React] - React module to use instead of importing `react`
* @returns {Promise<Function>} Next.js Client Component
*/
export async function createCoherentClientComponent(componentFactory, options = {}) {
const {
enablePerformanceMonitoring = false
} = options;
const React = await loadReact(options.React, 'Next.js Client Component integration');
return function CoherentClientComponent(props) {
const [html, setHtml] = React.useState('');
React.useEffect(() => {
async function renderComponent() {
try {
// Create component with props
const component = await Promise.resolve(
componentFactory(props)
);
if (!component) {
setHtml('Error: Component factory returned null/undefined');
return;
}
// Render component
let renderedHtml;
if (enablePerformanceMonitoring) {
const renderId = performanceMonitor.startRender();
renderedHtml = render(component);
performanceMonitor.endRender(renderId);
} else {
renderedHtml = render(component);
}
setHtml(renderedHtml);
} catch (_error) {
console.error('Coherent.js Next.js Client Component error:', _error);
setHtml(`Error: ${_error.message}`);
}
}
renderComponent();
}, [props]);
return React.createElement('div', {
dangerouslySetInnerHTML: { __html: html }
});
};
}
/**
* Create Next.js integration with dependency checking
* This function ensures Next.js and React are available before setting up the integration
*
* @param {Object} options - Setup options
* @returns {Promise<Object>} - Object with Next.js integration utilities
*/
export async function createNextIntegration(options = {}) {
try {
// Verify Next.js and React are available, resolved from this package
// (see loadReact for why not core's importPeerDependency)
try {
await import('next');
} catch (_error) {
throw missingPeer('next', 'Next.js integration', _error);
}
await loadReact(options.React, 'Next.js integration');
return {
createCoherentNextHandler: (componentFactory, handlerOptions = {}) =>
createCoherentNextHandler(componentFactory, { ...options, ...handlerOptions }),
createCoherentAppRouterHandler: (componentFactory, handlerOptions = {}) =>
createCoherentAppRouterHandler(componentFactory, { ...options, ...handlerOptions }),
createCoherentServerComponent: (componentFactory, componentOptions = {}) =>
createCoherentServerComponent(componentFactory, { ...options, ...componentOptions }),
createCoherentClientComponent: (componentFactory, componentOptions = {}) =>
createCoherentClientComponent(componentFactory, { ...options, ...componentOptions })
};
} catch (_error) {
throw _error;
}
}
// Export all utilities
export default {
createCoherentNextHandler,
createCoherentAppRouterHandler,
createCoherentServerComponent,
createCoherentClientComponent,
createNextIntegration
};
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