const iframeStorageBridge = (nonce) => `
(function () {
const NONCE = ${JSON.stringify(nonce)};
const memoryStore = Object.create(null);
const post = (type, payload) => {
window.parent.postMessage({ type, nonce: NONCE, ...payload }, '*');
};
const isValid = (data) => data && data.nonce === NONCE;
const mockStorage = {
getItem(key) {
return Object.hasOwn(memoryStore, key)
? memoryStore[key]
: null;
},
setItem(key, value) {
const v = String(value);
memoryStore[key] = v;
post('storage-set', { key, value: v });
},
removeItem(key) {
delete memoryStore[key];
post('storage-remove', { key });
},
clear() {
for (const key of Object.keys(memoryStore))
delete memoryStore[key];
post('storage-clear', {});
},
key(index) {
const keys = Object.keys(memoryStore);
return keys[index] ?? null;
},
get length() {
return Object.keys(memoryStore).length;
}
};
const defineLocalStorage = () => {
try {
Object.defineProperty(window, 'localStorage', {
value: mockStorage,
writable: false,
configurable: true
});
} catch {
window.localStorage = mockStorage;
}
};
defineLocalStorage();
window.addEventListener('message', (event) => {
const data = event.data;
if (!isValid(data) || data.type !== 'storage-sync-data') return;
const incoming = data.data || {};
for (const key of Object.keys(incoming))
memoryStore[key] = incoming[key];
if (typeof window.initTheme === 'function')
window.initTheme();
window.dispatchEvent(new Event('storage-ready'));
});
// Clipboard API is unavailable in data: URL iframe, so we use postMessage
document.addEventListener('DOMContentLoaded', function() {
window.copyErrorMessage = function(button) {
post('clipboard-copy', { text: button.dataset.errorText });
button.classList.add('copied');
setTimeout(function() { button.classList.remove('copied'); }, 2000);
};
});
post('storage-sync-request', {});
})();
`;
const parentStorageBridge = (nonce) => `
(function () {
const host = document.querySelector('nuxt-error-overlay');
if (!host) return;
const NONCE = ${JSON.stringify(nonce)};
const isValid = (data) => data && data.nonce === NONCE;
// Handle clipboard copy from iframe
window.addEventListener('message', function(e) {
if (isValid(e) && e.data.type === 'clipboard-copy') {
navigator.clipboard.writeText(e.data.text).catch(function() {});
}
});
const collectLocalStorage = () => {
const all = {};
for (let i = 0; i < localStorage.length; i++) {
const k = localStorage.key(i);
if (k != null) all[k] = localStorage.getItem(k);
}
return all;
};
const attachWhenReady = () => {
const root = host.shadowRoot;
if (!root)
return false;
const iframe = root.getElementById('frame');
if (!iframe || !iframe.contentWindow)
return false;
const handlers = {
'storage-set': (d) => localStorage.setItem(d.key, d.value),
'storage-remove': (d) => localStorage.removeItem(d.key),
'storage-clear': () => localStorage.clear(),
'storage-sync-request': () => {
iframe.contentWindow.postMessage({
type: 'storage-sync-data',
data: collectLocalStorage(),
nonce: NONCE
}, '*');
}
};
window.addEventListener('message', (event) => {
const data = event.data;
if (!isValid(data)) return;
const fn = handlers[data.type];
if (fn) fn(data);
});
return true;
};
if (attachWhenReady())
return;
const obs = new MutationObserver(() => {
if (attachWhenReady())
obs.disconnect();
});
obs.observe(host, { childList: true, subtree: true });
})();
`;
const errorCSS = `
:host {
--preview-width: 240px;
--preview-height: 180px;
--base-width: 1200px;
--base-height: 900px;
--z-base: 999999998;
--error-pip-left: auto;
--error-pip-top: auto;
--error-pip-right: 5px;
--error-pip-bottom: 5px;
--error-pip-origin: bottom right;
--app-preview-left: auto;
--app-preview-top: auto;
--app-preview-right: 5px;
--app-preview-bottom: 5px;
all: initial;
display: contents;
}
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border-width: 0;
}
#frame {
position: fixed;
left: 0;
top: 0;
width: 100vw;
height: 100vh;
border: none;
z-index: var(--z-base);
}
#frame[inert] {
left: var(--error-pip-left);
top: var(--error-pip-top);
right: var(--error-pip-right);
bottom: var(--error-pip-bottom);
width: var(--base-width);
height: var(--base-height);
transform: scale(calc(240 / 1200));
transform-origin: var(--error-pip-origin);
overflow: hidden;
border-radius: calc(1200 * 8px / 240);
}
#preview {
position: fixed;
left: var(--app-preview-left);
top: var(--app-preview-top);
right: var(--app-preview-right);
bottom: var(--app-preview-bottom);
width: var(--preview-width);
height: var(--preview-height);
overflow: hidden;
border-radius: 6px;
pointer-events: none;
z-index: var(--z-base);
background: white;
display: none;
}
#preview iframe {
transform-origin: var(--error-pip-origin);
}
#frame:not([inert]) + #preview {
display: block;
}
#toggle {
position: fixed;
left: var(--app-preview-left);
top: var(--app-preview-top);
right: calc(var(--app-preview-right) - 3px);
bottom: calc(var(--app-preview-bottom) - 3px);
width: var(--preview-width);
height: var(--preview-height);
background: none;
border: 3px solid #00DC82;
border-radius: 8px;
cursor: pointer;
opacity: 0.8;
transition: opacity 0.2s, box-shadow 0.2s;
z-index: calc(var(--z-base) + 1);
display: flex;
align-items: center;
justify-content: center;
}
#toggle:hover,
#toggle:focus {
opacity: 1;
box-shadow: 0 0 20px rgba(0, 220, 130, 0.6);
}
#toggle:focus-visible {
outline: 3px solid #00DC82;
outline-offset: 0;
box-shadow: 0 0 24px rgba(0, 220, 130, 0.8);
}
#frame[inert] ~ #toggle {
left: var(--error-pip-left);
top: var(--error-pip-top);
right: calc(var(--error-pip-right) - 3px);
bottom: calc(var(--error-pip-bottom) - 3px);
cursor: grab;
}
:host(.dragging) #frame[inert] ~ #toggle {
cursor: grabbing;
}
#frame:not([inert]) ~ #toggle,
#frame:not([inert]) + #preview {
cursor: grab;
}
:host(.dragging-preview) #frame:not([inert]) ~ #toggle,
:host(.dragging-preview) #frame:not([inert]) + #preview {
cursor: grabbing;
}
#pip-close {
position: absolute;
top: 6px;
right: 6px;
width: 24px;
height: 24px;
border-radius: 50%;
border: none;
background: rgba(0, 0, 0, 0.75);
color: #fff;
font-size: 16px;
line-height: 1;
display: inline-flex;
align-items: center;
justify-content: center;
cursor: pointer;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
pointer-events: auto;
}
#pip-close:focus-visible {
outline: 2px solid #00DC82;
outline-offset: 2px;
}
#pip-restore {
position: fixed;
right: 16px;
bottom: 16px;
padding: 8px 14px;
border-radius: 999px;
border: 2px solid #00DC82;
background: #111;
color: #fff;
font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
font-size: 14px;
display: inline-flex;
align-items: center;
gap: 6px;
z-index: calc(var(--z-base) + 2);
cursor: grab;
}
#pip-restore:focus-visible {
outline: 2px solid #00DC82;
outline-offset: 2px;
}
:host(.dragging-restore) #pip-restore {
cursor: grabbing;
}
#frame[hidden],
#toggle[hidden],
#preview[hidden],
#pip-restore[hidden],
#pip-close[hidden] {
display: none !important;
}
@media (prefers-reduced-motion: reduce) {
#toggle {
transition: none;
}
}
`;
function webComponentScript(base64HTML, startMinimized) {
return `
(function () {
try {
// =========================
// Host + Shadow
// =========================
const host = document.querySelector('nuxt-error-overlay');
if (!host)
return;
const shadow = host.attachShadow({ mode: 'open' });
// =========================
// DOM helpers
// =========================
const el = (tag) => document.createElement(tag);
const on = (node, type, fn, opts) => node.addEventListener(type, fn, opts);
const hide = (node, v) => node.toggleAttribute('hidden', !!v);
const setVar = (name, value) => host.style.setProperty(name, value);
const unsetVar = (name) => host.style.removeProperty(name);
// =========================
// Create DOM
// =========================
const style = el('style');
style.textContent = ${JSON.stringify(errorCSS)};
const iframe = el('iframe');
iframe.id = 'frame';
iframe.src = 'data:text/html;base64,${base64HTML}';
iframe.title = 'Detailed error stack trace';
iframe.setAttribute('sandbox', 'allow-scripts allow-same-origin');
const preview = el('div');
preview.id = 'preview';
const toggle = el('div');
toggle.id = 'toggle';
toggle.setAttribute('aria-expanded', 'true');
toggle.setAttribute('role', 'button');
toggle.setAttribute('tabindex', '0');
toggle.innerHTML = 'Toggle detailed error view';
const liveRegion = el('div');
liveRegion.setAttribute('role', 'status');
liveRegion.setAttribute('aria-live', 'polite');
liveRegion.className = 'sr-only';
const pipCloseButton = el('button');
pipCloseButton.id = 'pip-close';
pipCloseButton.setAttribute('type', 'button');
pipCloseButton.setAttribute('aria-label', 'Hide error preview overlay');
pipCloseButton.innerHTML = '×';
pipCloseButton.hidden = true;
toggle.appendChild(pipCloseButton);
const pipRestoreButton = el('button');
pipRestoreButton.id = 'pip-restore';
pipRestoreButton.setAttribute('type', 'button');
pipRestoreButton.setAttribute('aria-label', 'Show error overlay');
pipRestoreButton.innerHTML = '⟲Show error overlay';
pipRestoreButton.hidden = true;
// Order matters: #frame + #preview adjacency
shadow.appendChild(style);
shadow.appendChild(liveRegion);
shadow.appendChild(iframe);
shadow.appendChild(preview);
shadow.appendChild(toggle);
shadow.appendChild(pipRestoreButton);
// =========================
// Constants / keys
// =========================
const POS_KEYS = {
position: 'nuxt-error-overlay:position',
hiddenPretty: 'nuxt-error-overlay:error-pip:hidden',
hiddenPreview: 'nuxt-error-overlay:app-preview:hidden'
};
const CSS_VARS = {
pip: {
left: '--error-pip-left',
top: '--error-pip-top',
right: '--error-pip-right',
bottom: '--error-pip-bottom'
},
preview: {
left: '--app-preview-left',
top: '--app-preview-top',
right: '--app-preview-right',
bottom: '--app-preview-bottom'
}
};
const MIN_GAP = 5;
const DRAG_THRESHOLD = 2;
// =========================
// Local storage safe access + state
// =========================
let storageReady = true;
let isPrettyHidden = false;
let isPreviewHidden = false;
const safeGet = (k) => {
try {
return localStorage.getItem(k);
} catch {
return null;
}
};
const safeSet = (k, v) => {
if (!storageReady)
return;
try {
localStorage.setItem(k, v);
} catch {}
};
// =========================
// Sizing helpers
// =========================
const vvSize = () => {
const v = window.visualViewport;
return v ? { w: v.width, h: v.height } : { w: window.innerWidth, h: window.innerHeight };
};
const previewSize = () => {
const styles = getComputedStyle(host);
const w = parseFloat(styles.getPropertyValue('--preview-width')) || 240;
const h = parseFloat(styles.getPropertyValue('--preview-height')) || 180;
return { w, h };
};
const sizeForTarget = (target) => {
if (!target)
return previewSize();
const rect = target.getBoundingClientRect();
if (rect.width && rect.height)
return { w: rect.width, h: rect.height };
return previewSize();
};
// =========================
// Dock model + offset/alignment calculations
// =========================
const dock = { edge: null, offset: null, align: null, gap: null };
const maxOffsetFor = (edge, size) => {
const vv = vvSize();
if (edge === 'left' || edge === 'right')
return Math.max(MIN_GAP, vv.h - size.h - MIN_GAP);
return Math.max(MIN_GAP, vv.w - size.w - MIN_GAP);
};
const clampOffset = (edge, value, size) => {
const max = maxOffsetFor(edge, size);
return Math.min(Math.max(value, MIN_GAP), max);
};
const updateDockAlignment = (size) => {
if (!dock.edge || dock.offset == null)
return;
const max = maxOffsetFor(dock.edge, size);
if (dock.offset <= max / 2) {
dock.align = 'start';
dock.gap = dock.offset;
} else {
dock.align = 'end';
dock.gap = Math.max(0, max - dock.offset);
}
};
const appliedOffsetFor = (size) => {
if (!dock.edge || dock.offset == null)
return null;
const max = maxOffsetFor(dock.edge, size);
if (dock.align === 'end' && typeof dock.gap === 'number') {
return clampOffset(dock.edge, max - dock.gap, size);
}
if (dock.align === 'start' && typeof dock.gap === 'number') {
return clampOffset(dock.edge, dock.gap, size);
}
return clampOffset(dock.edge, dock.offset, size);
};
const nearestEdgeAt = (x, y) => {
const { w, h } = vvSize();
const d = { left: x, right: w - x, top: y, bottom: h - y };
return Object.keys(d).reduce((a, b) => (d[a] < d[b] ? a : b));
};
const cornerDefaultDock = () => {
const vv = vvSize();
const size = previewSize();
const offset = Math.max(MIN_GAP, vv.w - size.w - MIN_GAP);
return { edge: 'bottom', offset };
};
const currentTransformOrigin = () => {
if (!dock.edge) return null;
if (dock.edge === 'left' || dock.edge === 'top')
return 'top left';
if (dock.edge === 'right')
return 'top right';
return 'bottom left';
};
// =========================
// Persist / load dock
// =========================
const loadDock = () => {
const raw = safeGet(POS_KEYS.position);
if (!raw)
return;
try {
const parsed = JSON.parse(raw);
const { edge, offset, align, gap } = parsed || {};
if (!['left', 'right', 'top', 'bottom'].includes(edge))
return;
if (typeof offset !== 'number')
return;
dock.edge = edge;
dock.offset = clampOffset(edge, offset, previewSize());
dock.align = align === 'start' || align === 'end' ? align : null;
dock.gap = typeof gap === 'number' ? gap : null;
if (!dock.align || dock.gap == null)
updateDockAlignment(previewSize());
} catch {}
};
const persistDock = () => {
if (!dock.edge || dock.offset == null)
return;
safeSet(POS_KEYS.position, JSON.stringify({
edge: dock.edge,
offset: dock.offset,
align: dock.align,
gap: dock.gap
}));
};
// =========================
// Apply dock
// =========================
const dockToVars = (vars) => ({
set: (side, v) => host.style.setProperty(vars[side], v),
clear: (side) => host.style.removeProperty(vars[side])
});
const dockToEl = (node) => ({
set: (side, v) => { node.style[side] = v; },
clear: (side) => { node.style[side] = ''; }
});
const applyDock = (target, size, opts) => {
if (!dock.edge || dock.offset == null) {
target.clear('left');
target.clear('top');
target.clear('right');
target.clear('bottom');
return;
}
target.set('left', 'auto');
target.set('top', 'auto');
target.set('right', 'auto');
target.set('bottom', 'auto');
const applied = appliedOffsetFor(size);
if (dock.edge === 'left') {
target.set('left', MIN_GAP + 'px');
target.set('top', applied + 'px');
} else if (dock.edge === 'right') {
target.set('right', MIN_GAP + 'px');
target.set('top', applied + 'px');
} else if (dock.edge === 'top') {
target.set('top', MIN_GAP + 'px');
target.set('left', applied + 'px');
} else {
target.set('bottom', MIN_GAP + 'px');
target.set('left', applied + 'px');
}
if (!opts || opts.persist !== false)
persistDock();
};
const applyDockAll = (opts) => {
applyDock(dockToVars(CSS_VARS.pip), previewSize(), opts);
applyDock(dockToVars(CSS_VARS.preview), previewSize(), opts);
applyDock(dockToEl(pipRestoreButton), sizeForTarget(pipRestoreButton), opts);
};
const repaintToDock = () => {
if (!dock.edge || dock.offset == null)
return;
const origin = currentTransformOrigin();
if (origin)
setVar('--error-pip-origin', origin);
else
unsetVar('--error-pip-origin');
applyDockAll({ persist: false });
};
// =========================
// Hidden state + UI
// =========================
const loadHidden = () => {
const rawPretty = safeGet(POS_KEYS.hiddenPretty);
if (rawPretty != null)
isPrettyHidden = rawPretty === '1' || rawPretty === 'true';
const rawPreview = safeGet(POS_KEYS.hiddenPreview);
if (rawPreview != null)
isPreviewHidden = rawPreview === '1' || rawPreview === 'true';
};
const setPrettyHidden = (v) => {
isPrettyHidden = !!v;
safeSet(POS_KEYS.hiddenPretty, isPrettyHidden ? '1' : '0');
updateUI();
};
const setPreviewHidden = (v) => {
isPreviewHidden = !!v;
safeSet(POS_KEYS.hiddenPreview, isPreviewHidden ? '1' : '0');
updateUI();
};
const isMinimized = () => iframe.hasAttribute('inert');
const setMinimized = (v) => {
if (v) {
iframe.setAttribute('inert', '');
toggle.setAttribute('aria-expanded', 'false');
} else {
iframe.removeAttribute('inert');
toggle.setAttribute('aria-expanded', 'true');
}
};
const setRestoreLabel = (kind) => {
if (kind === 'pretty') {
pipRestoreButton.innerHTML = '⟲Show error overlay';
pipRestoreButton.setAttribute('aria-label', 'Show error overlay');
} else {
pipRestoreButton.innerHTML = '⟲Show error page';
pipRestoreButton.setAttribute('aria-label', 'Show error page');
}
};
const updateUI = () => {
const minimized = isMinimized();
const showPiP = minimized && !isPrettyHidden;
const showPreview = !minimized && !isPreviewHidden;
const pipHiddenByUser = minimized && isPrettyHidden;
const previewHiddenByUser = !minimized && isPreviewHidden;
const showToggle = minimized ? showPiP : showPreview;
const showRestore = pipHiddenByUser || previewHiddenByUser;
hide(iframe, pipHiddenByUser);
hide(preview, !showPreview);
hide(toggle, !showToggle);
hide(pipCloseButton, !showToggle);
hide(pipRestoreButton, !showRestore);
pipCloseButton.setAttribute('aria-label', minimized ? 'Hide error overlay' : 'Hide error page preview');
if (pipHiddenByUser)
setRestoreLabel('pretty');
else if (previewHiddenByUser)
setRestoreLabel('preview');
host.classList.toggle('pip-hidden', isPrettyHidden);
host.classList.toggle('preview-hidden', isPreviewHidden);
};
// =========================
// Preview snapshot
// =========================
const updatePreview = () => {
try {
let previewIframe = preview.querySelector('iframe');
if (!previewIframe) {
previewIframe = el('iframe');
previewIframe.style.cssText = 'width: 1200px; height: 900px; transform: scale(0.2); transform-origin: top left; border: none;';
previewIframe.setAttribute('sandbox', 'allow-scripts allow-same-origin');
preview.appendChild(previewIframe);
}
const doctype = document.doctype ? '' : '';
const cleanedHTML = document.documentElement.outerHTML
.replace(/]*>.*?<\\/nuxt-error-overlay>/gs, '')
.replace(/