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* HMR Error Overlay
*
* Displays error information in a full-screen overlay with Shadow DOM isolation.
* Provides click-to-open editor support and keyboard/click dismissal.
*
* @module @coherent.js/client/hmr/overlay
*/
/**
* Escape HTML special characters to prevent XSS.
* @param {string} str - String to escape
* @returns {string} Escaped string
*/
export function escapeHtml(str) {
return String(str)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"');
}
/**
* Format code frame with line numbers and highlight.
* @param {string} frame - Code frame content
* @param {number} highlightLine - Line number to highlight (1-based)
* @param {number} [startLine=1] - Starting line number for the frame
* @returns {string} Formatted HTML string
*/
export function formatCodeFrame(frame, highlightLine, startLine = 1) {
if (!frame) return '';
const lines = frame.split('\n');
return lines.map((content, i) => {
const lineNum = startLine + i;
const isHighlight = lineNum === highlightLine;
return `<div class="line${isHighlight ? ' highlight' : ''}">
<span class="line-number">${lineNum}</span>
<span class="line-content">${escapeHtml(content)}</span>
</div>`;
}).join('');
}
/**
* Editor URL scheme map for click-to-open functionality.
*/
const EDITOR_URLS = {
vscode: (file, line) => `vscode://file/${file}:${line}`,
cursor: (file, line) => `cursor://file/${file}:${line}`,
'vscode-insiders': (file, line) => `vscode-insiders://file/${file}:${line}`,
atom: (file, line) => `atom://core/open/file?filename=${file}&line=${line}`,
sublime: (file, line) => `subl://open?url=file://${file}&line=${line}`,
webstorm: (file, line) => `webstorm://open?file=${file}&line=${line}`,
idea: (file, line) => `idea://open?file=${file}&line=${line}`
};
/**
* CSS styles for the error overlay (Dracula-inspired color scheme).
*/
const OVERLAY_STYLES = `
:host {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 99999;
--bg: #181818;
--text: #f8f8f2;
--red: #ff5555;
--yellow: #f1fa8c;
--purple: #bd93f9;
--cyan: #8be9fd;
--code-bg: #282a36;
--line-num: #6272a4;
}
.backdrop {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.66);
}
.container {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: min(800px, 90vw);
max-height: 90vh;
overflow: auto;
background: var(--bg);
border-radius: 8px;
box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
font-family: 'SF Mono', Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
}
.header {
padding: 16px 20px;
background: var(--red);
color: white;
display: flex;
justify-content: space-between;
align-items: center;
border-radius: 8px 8px 0 0;
}
.title {
font-weight: bold;
font-size: 16px;
}
.close-btn {
background: none;
border: none;
color: white;
font-size: 24px;
cursor: pointer;
padding: 0 8px;
line-height: 1;
}
.close-btn:hover {
opacity: 0.8;
}
.content {
padding: 20px;
color: var(--text);
}
.message {
font-size: 18px;
color: var(--red);
margin-bottom: 20px;
word-break: break-word;
}
.file {
color: var(--cyan);
margin-bottom: 16px;
cursor: pointer;
text-decoration: underline;
}
.file:hover {
color: var(--purple);
}
.code-frame {
background: var(--code-bg);
padding: 16px;
border-radius: 4px;
overflow-x: auto;
font-size: 14px;
line-height: 1.5;
margin-bottom: 16px;
}
.line {
display: flex;
}
.line-number {
width: 50px;
color: var(--line-num);
text-align: right;
padding-right: 16px;
user-select: none;
flex-shrink: 0;
}
.line-content {
flex: 1;
white-space: pre;
}
.line.highlight {
background: rgba(255, 85, 85, 0.2);
}
.line.highlight .line-content {
color: var(--red);
}
.stack {
margin-top: 20px;
font-size: 12px;
color: var(--line-num);
white-space: pre-wrap;
max-height: 200px;
overflow-y: auto;
}
.tip {
margin-top: 16px;
padding: 12px;
background: rgba(189, 147, 249, 0.1);
border-left: 3px solid var(--purple);
font-size: 13px;
color: var(--text);
}
.tip strong {
color: var(--purple);
}
`;
/**
* Error overlay class for HMR error display.
* Uses Shadow DOM for complete style isolation.
*/
export class ErrorOverlay {
constructor() {
/** @type {{ host: HTMLElement, shadow: ShadowRoot } | null} */
this.overlay = null;
/** @type {string} */
this.editor = this._getStoredEditor();
/** @type {((e: KeyboardEvent) => void) | null} */
this.escapeHandler = null;
}
/**
* Get stored editor preference from localStorage.
* @returns {string} Editor name
* @private
*/
_getStoredEditor() {
try {
return localStorage.getItem('coherent-editor') || 'vscode';
} catch {
return 'vscode';
}
}
/**
* Create the overlay element with Shadow DOM.
* @returns {{ host: HTMLElement, shadow: ShadowRoot }} Overlay elements
*/
createOverlay() {
if (this.overlay) return this.overlay;
const host = document.createElement('div');
host.id = 'coherent-error-overlay';
const shadow = host.attachShadow({ mode: 'open' });
const style = document.createElement('style');
style.textContent = OVERLAY_STYLES;
shadow.appendChild(style);
this.overlay = { host, shadow };
return this.overlay;
}
/**
* Show the error overlay with error details.
* @param {Object} error - Error details
* @param {string} error.message - Error message
* @param {string} [error.file] - File path
* @param {number} [error.line] - Line number
* @param {number} [error.column] - Column number
* @param {string} [error.frame] - Code frame with context
* @param {string} [error.stack] - Stack trace
*/
show(error) {
const { host, shadow } = this.createOverlay();
// Clear previous content (but keep styles)
const existingWrapper = shadow.querySelector('.wrapper');
if (existingWrapper) existingWrapper.remove();
// Calculate start line for code frame (center on error line)
const frameLines = error.frame ? error.frame.split('\n').length : 0;
const startLine = error.line ? Math.max(1, error.line - Math.floor(frameLines / 2)) : 1;
const wrapper = document.createElement('div');
wrapper.className = 'wrapper';
wrapper.innerHTML = `
<div class="backdrop"></div>
<div class="container">
<div class="header">
<span class="title">HMR Error</span>
<button class="close-btn" title="Close (Escape)">×</button>
</div>
<div class="content">
<div class="message">${escapeHtml(error.message || 'Unknown error')}</div>
${error.file ? `
<div class="file" data-file="${escapeHtml(error.file)}" data-line="${error.line || 1}">
${escapeHtml(error.file)}${error.line ? `:${error.line}` : ''}${error.column ? `:${error.column}` : ''}
</div>
` : ''}
${error.frame ? `
<div class="code-frame">${formatCodeFrame(error.frame, error.line, startLine)}</div>
` : ''}
${error.stack ? `
<div class="stack">${escapeHtml(error.stack)}</div>
` : ''}
<div class="tip">
Press <strong>Escape</strong> or click the X to dismiss.
${error.file ? ` Click the file path to open in ${this.editor}.` : ''}
</div>
</div>
</div>
`;
shadow.appendChild(wrapper);
// Event handlers
const closeBtn = wrapper.querySelector('.close-btn');
const backdrop = wrapper.querySelector('.backdrop');
const fileLink = wrapper.querySelector('.file');
closeBtn?.addEventListener('click', () => this.hide());
backdrop?.addEventListener('click', () => this.hide());
fileLink?.addEventListener('click', (e) => {
const target = e.target;
const file = target.dataset.file;
const line = parseInt(target.dataset.line, 10) || 1;
this.openInEditor(file, line);
});
// Escape key handler
this.escapeHandler = (e) => {
if (e.key === 'Escape') this.hide();
};
document.addEventListener('keydown', this.escapeHandler);
// Add to DOM if not already
Eif (!host.parentNode) {
document.body.appendChild(host);
}
}
/**
* Hide and remove the error overlay.
*/
hide() {
if (this.overlay?.host.parentNode) {
this.overlay.host.parentNode.removeChild(this.overlay.host);
}
if (this.escapeHandler) {
document.removeEventListener('keydown', this.escapeHandler);
this.escapeHandler = null;
}
// Reset overlay reference so it can be recreated
this.overlay = null;
}
/**
* Open file in configured editor.
* @param {string} file - File path
* @param {number} [line=1] - Line number
*/
openInEditor(file, line = 1) {
const urlGenerator = EDITOR_URLS[this.editor] || EDITOR_URLS.vscode;
const url = urlGenerator(file, line);
window.open(url, '_self');
}
/**
* Set preferred editor and store in localStorage.
* @param {string} editor - Editor name (vscode, cursor, vscode-insiders, atom, sublime, webstorm, idea)
*/
setEditor(editor) {
this.editor = editor;
try {
localStorage.setItem('coherent-editor', editor);
} catch {
// Ignore localStorage errors
}
}
}
/**
* Singleton instance of ErrorOverlay.
*/
export const errorOverlay = new ErrorOverlay();
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