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* Coherent.js Error Boundary
*
* Catches rendering errors and provides fallback UI.
* Similar to React's Error Boundaries but for Coherent.js.
*
* @module components/error-boundary
*/
import { isTrustedContent } from '../core/html-utils.js';
/**
* Whether error state may persist between calls. In a browser a boundary
* wraps one live UI, so "stay on the fallback until reset" makes sense. On
* the server every call is a different request: shared state switched every
* later request to the fallback after one failure, and kept that request's
* props (possibly personal data) in memory.
*/
function isBrowser() {
return typeof window !== 'undefined' && typeof document !== 'undefined';
}
/**
* Evaluate function components nested in a tree (called without arguments,
* as the renderer does), so that errors they throw happen inside the
* boundary's try block. Otherwise the renderer calls them after the boundary
* has returned and nested errors escape it.
*/
function resolveNestedComponents(node, depth = 0) {
Iif (depth > 1000) return node;
if (typeof node === 'function') {
return resolveNestedComponents(node(), depth + 1);
}
if (Array.isArray(node)) {
let changed = false;
const resolved = node.map((child) => {
const result = resolveNestedComponents(child, depth + 1);
Iif (result !== child) changed = true;
return result;
});
return changed ? resolved : node;
}
Eif (node && typeof node === 'object' && !isTrustedContent(node)) {
const keys = Object.keys(node);
Iif (keys.length !== 1) return node;
const tag = keys[0];
const props = node[tag];
if (props && typeof props === 'object' && !Array.isArray(props) && props.children !== undefined) {
const children = resolveNestedComponents(props.children, depth + 1);
Iif (children !== props.children) {
return { [tag]: { ...props, children } };
}
}
}
return node;
}
/**
* Error boundary state
*/
class ErrorBoundaryState {
constructor() {
this.hasError = false;
this.error = null;
this.errorInfo = null;
this.errorCount = 0;
this.lastError = null;
}
reset() {
this.hasError = false;
this.error = null;
this.errorInfo = null;
}
setError(error, errorInfo = {}) {
this.hasError = true;
this.error = error;
this.errorInfo = errorInfo;
this.errorCount++;
this.lastError = Date.now();
}
}
/**
* Create an error boundary
*
* @param {Object} options - Error boundary options
* @param {Object|Function} options.fallback - Fallback component or function
* @param {Function} [options.onError] - Error callback
* @param {Function} [options.onReset] - Reset callback
* @param {Array<string>} [options.resetKeys] - Keys that trigger reset
* @param {boolean} [options.resetOnPropsChange] - Reset on props change
* @param {number} [options.maxErrors] - Maximum errors before permanent fallback
* @param {number} [options.resetTimeout] - Auto-reset timeout in ms
* @returns {Function} Error boundary wrapper function
*
* @example
* const boundary = createErrorBoundary({
* fallback: { div: { text: 'Something went wrong' } },
* onError: (error, errorInfo) => console.error(error),
* resetKeys: ['userId']
* });
*
* const SafeComponent = boundary(MyComponent);
*/
export function createErrorBoundary(options = {}) {
const {
fallback = { div: { className: 'error-boundary', text: 'An error occurred' } },
onError = null,
onReset = null,
resetKeys = [],
resetOnPropsChange = false,
maxErrors = Infinity,
resetTimeout = null
} = options;
const sharedState = new ErrorBoundaryState();
let previousProps = {};
let resetTimer = null;
/**
* Wrap a component with error boundary
*/
return function errorBoundaryWrapper(component) {
return function wrappedComponent(props = {}) {
const persistent = isBrowser();
const state = persistent ? sharedState : new ErrorBoundaryState();
try {
// Check if we should reset based on props
Iif (persistent && resetOnPropsChange && shouldReset(props, previousProps, resetKeys)) {
state.reset();
if (onReset) {
onReset();
}
}
Iif (persistent) {
previousProps = { ...props };
}
// If we have an error and haven't exceeded max errors
Iif (state.hasError) {
if (state.errorCount >= maxErrors) {
// Permanent fallback
return typeof fallback === 'function'
? fallback(state.error, state.errorInfo, { permanent: true })
: fallback;
}
// Return fallback with reset option
const fallbackComponent = typeof fallback === 'function'
? fallback(state.error, state.errorInfo, {
reset: () => {
state.reset();
if (onReset) {
onReset();
}
},
errorCount: state.errorCount
})
: fallback;
return fallbackComponent;
}
// Try to render the component, nested function components included
const result = typeof component === 'function'
? component(props)
: component;
return resolveNestedComponents(result);
} catch (error) {
// Capture error
const errorInfo = {
componentStack: error.stack,
props,
timestamp: Date.now()
};
state.setError(error, errorInfo);
// Call error callback
if (onError) {
try {
onError(error, errorInfo);
} catch (callbackError) {
console.error('Error in onError callback:', callbackError);
}
}
// Set auto-reset timer if configured
Iif (persistent && resetTimeout && !resetTimer) {
resetTimer = setTimeout(() => {
state.reset();
resetTimer = null;
if (onReset) {
onReset();
}
}, resetTimeout);
}
// Return fallback
return typeof fallback === 'function'
? fallback(error, errorInfo, {
reset: () => {
state.reset();
if (resetTimer) {
clearTimeout(resetTimer);
resetTimer = null;
}
if (onReset) {
onReset();
}
},
errorCount: state.errorCount
})
: fallback;
}
};
};
}
/**
* Check if error boundary should reset based on props
*/
function shouldReset(newProps, oldProps, resetKeys) {
if (resetKeys.length === 0) {
return false;
}
return resetKeys.some(key => newProps[key] !== oldProps[key]);
}
/**
* Create a default error fallback component
*
* @param {Object} options - Fallback options
* @returns {Function} Fallback component function
*/
export function createErrorFallback(options = {}) {
const {
title = 'Something went wrong',
showError = true,
showStack = false,
showReset = true,
className = 'error-boundary-fallback',
style = {}
} = options;
return function errorFallback(error, errorInfo, context = {}) {
const children = [
{
h2: {
className: 'error-title',
text: title
}
}
];
Eif (showError && error) {
children.push({
p: {
className: 'error-message',
text: error.message || 'Unknown error'
}
});
}
Iif (showStack && error && error.stack) {
children.push({
pre: {
className: 'error-stack',
text: error.stack
}
});
}
Iif (showReset && context.reset && !context.permanent) {
children.push({
button: {
className: 'error-reset-button',
text: 'Try Again',
onclick: context.reset
}
});
}
Iif (context.errorCount > 1) {
children.push({
p: {
className: 'error-count',
text: `Error occurred ${context.errorCount} times`
}
});
}
return {
div: {
className,
style: {
padding: '20px',
border: '1px solid #f44336',
borderRadius: '4px',
backgroundColor: '#ffebee',
color: '#c62828',
...style
},
children
}
};
};
}
/**
* Wrap multiple components with the same error boundary
*
* @param {Object} options - Error boundary options
* @param {Object} components - Components to wrap
* @returns {Object} Wrapped components
*
* @example
* const safeComponents = withErrorBoundary(
* { fallback: ErrorFallback },
* { Header, Footer, Content }
* );
*/
export function withErrorBoundary(options, components) {
const boundary = createErrorBoundary(options);
const wrapped = {};
Object.entries(components).forEach(([name, component]) => {
wrapped[name] = boundary(component);
});
return wrapped;
}
/**
* Error boundary for async components
*
* @param {Object} options - Error boundary options
* @returns {Function} Async error boundary wrapper
*/
export function createAsyncErrorBoundary(options = {}) {
const {
fallback = { div: { text: 'Loading...' } },
errorFallback = { div: { text: 'Failed to load' } },
onError = null,
timeout = 10000
} = options;
return function asyncBoundaryWrapper(asyncComponent) {
return async function wrappedAsyncComponent(props = {}) {
let timer;
try {
// Set timeout (cleared below: a pending timer per call kept the
// process alive for `timeout` ms after every render)
const timeoutPromise = new Promise((_, reject) => {
timer = setTimeout(() => reject(new Error('Component load timeout')), timeout);
});
// Race between component load and timeout
const result = await Promise.race([
typeof asyncComponent === 'function'
? asyncComponent(props)
: asyncComponent,
timeoutPromise
]);
return result ?? fallback;
} catch (error) {
Iif (onError) {
onError(error, { props, async: true });
}
return typeof errorFallback === 'function'
? errorFallback(error, { props })
: errorFallback;
} finally {
clearTimeout(timer);
}
};
};
}
/**
* Global error handler for uncaught errors
*/
export class GlobalErrorHandler {
constructor(options = {}) {
this.options = options;
this.errors = [];
this.maxErrors = options.maxErrors || 100;
this.onError = options.onError || null;
this.enabled = options.enabled !== false;
}
/**
* Capture an error
*/
captureError(error, context = {}) {
Iif (!this.enabled) return;
const errorEntry = {
error,
context,
timestamp: Date.now(),
stack: error.stack
};
this.errors.push(errorEntry);
// Limit stored errors
if (this.errors.length > this.maxErrors) {
this.errors.shift();
}
// Call error callback
Iif (this.onError) {
try {
this.onError(error, context);
} catch (callbackError) {
console.error('Error in global error handler callback:', callbackError);
}
}
}
/**
* Get all captured errors
*/
getErrors() {
return [...this.errors];
}
/**
* Clear all errors
*/
clearErrors() {
this.errors = [];
}
/**
* Get error statistics
*/
getStats() {
return {
totalErrors: this.errors.length,
enabled: this.enabled,
maxErrors: this.maxErrors
};
}
/**
* Enable error handler
*/
enable() {
this.enabled = true;
}
/**
* Disable error handler
*/
disable() {
this.enabled = false;
}
}
/**
* Create a global error handler
*/
export function createGlobalErrorHandler(options = {}) {
return new GlobalErrorHandler(options);
}
/**
* Export all error boundary utilities
*/
export default {
createErrorBoundary,
createErrorFallback,
withErrorBoundary,
createAsyncErrorBoundary,
GlobalErrorHandler,
createGlobalErrorHandler
};
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