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fix: improve error handling #3321

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fix: improve error handling #3321

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4 changes: 2 additions & 2 deletions examples/rss-reader/src/index.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -27,12 +27,12 @@ function decodeEntities(value: string): string {

return value.replace(/&(#x?[0-9a-fA-F]+|[a-zA-Z]+);/g, (match, entity: string) => {
if (entity.startsWith('#x')) {
const codePoint = Number.parseInt(entity.slice(2), 16);
const codePoint = Number.parseInt(entity.slice(2, 10), 16);
return Number.isFinite(codePoint) ? String.fromCodePoint(codePoint) : match;
}

if (entity.startsWith('#')) {
const codePoint = Number.parseInt(entity.slice(1), 10);
const codePoint = Number.parseInt(entity.slice(1, 10), 10);
Comment on lines +30 to +35

@coderabbitai coderabbitai Bot Jul 30, 2026

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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Validate the complete numeric entity before conversion.

slice(..., 10) parses only a prefix, so an oversized entity such as &#x000041000000; can be silently decoded from truncated data instead of falling back to match. Number.isFinite also allows values above 0x10FFFF, which can make String.fromCodePoint throw on RSS input. Reject oversized significant payloads and require 0 <= codePoint <= 0x10FFFF in both branches.

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@examples/rss-reader/src/index.tsx` around lines 30 - 35, Update both
numeric-entity branches in the entity-decoding logic to validate the complete
payload before conversion: stop parsing a fixed ten-character prefix, reject
entities with oversized significant digits or trailing invalid characters, and
only call String.fromCodePoint when the resulting codePoint is finite and within
0 through 0x10FFFF; otherwise return match.

return Number.isFinite(codePoint) ? String.fromCodePoint(codePoint) : match;
}

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2 changes: 1 addition & 1 deletion examples/widget-gallery/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ class WidgetGalleryApp extends Widget {
}

// Tab switching: 1-6
const num = parseInt(event.key);
const num = parseInt(event.key, 10);
if (num >= 1 && num <= 6) {
this._switchTab(num - 1);
return true;
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