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fix: enable inline math formula rendering in web UI #1474

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fix: enable inline math formula rendering in web UI #1474

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1 change: 1 addition & 0 deletions web/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@
"gitdiff-parser": "^0.3.1",
"js-md5": "^0.8.3",
"js-yaml": "^4.1.1",
"katex": "^0.16.28",
"lucide-react": "^0.561.0",
"motion": "^12.23.24",
"nanoid": "^5.1.6",
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1 change: 1 addition & 0 deletions web/src/bootstrap.tsx
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@@ -1,6 +1,7 @@
import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import "./index.css";
import "katex/dist/katex.min.css";
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@chatgpt-codex-connector chatgpt-codex-connector Bot Mar 17, 2026

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P2 Badge Declare katex as a direct web dependency

Importing katex/dist/katex.min.css here relies on katex being hoisted from streamdown’s transitive dependencies, but web/package.json does not declare katex itself. This can break the web build in environments that don't hoist transitive packages (or after future dependency graph changes), where Vite will fail to resolve the import at startup; adding katex as a direct dependency avoids that fragility.

Useful? React with 👍 / 👎.

import App from "./App.tsx";
import { ErrorBoundary } from "./components/error-boundary";

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13 changes: 8 additions & 5 deletions web/src/components/ai-elements/streamdown.tsx
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Expand Up @@ -28,11 +28,14 @@ export const safeRehypePlugins: StreamdownProps["rehypePlugins"] = [
* 2. Escapes both < and > in HTML-like tags elsewhere
*/
export const escapeHtmlOutsideCodeBlocks = (text: string): string => {
// Match ONLY valid fenced code blocks (``` at line start) and inline code.
// Mid-line ``` is a syntax error and should be treated as plain text.
// Fenced code blocks: ``` at line start, optional language, content, then \n```
// Also match inline code: `..` (single backticks, no newlines inside)
const codeBlockRegex = /(^|\n)```[a-z]*\n[\s\S]*?\n```|`[^`\n]+`/g;
// Match regions that should NOT be escaped:
// 1. Fenced code blocks: ``` at line start, optional language, content, then \n```
// 2. Inline code: `..` (single backticks, no newlines inside)
// 3. Display math: $$...$$ (can span multiple lines)
// 4. Inline math: $...$ (no newlines, non-empty, no leading/trailing space)
// Math delimiters must be preserved because KaTeX needs raw < and > for expressions like $x < y$.
const codeBlockRegex =
/(^|\n)```[a-z]*\n[\s\S]*?\n```|`[^`\n]+`|\$\$[\s\S]*?\$\$|\$(?!\s)[^$\n]+(?<!\s)\$/g;
const codeBlocks: { start: number; end: number }[] = [];

// Find all valid code blocks
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