TypeError: Cannot read properties of undefined (reading 'match') in parseRuleCode when oxlint diagnostic has no code field

[shamscorner]

Description

Running npx react-doctor@latest . crashes with:

Lint did not run: Failed to run oxlint: TypeError: Cannot read properties of undefined (reading 'match')
at parseRuleCode (file:///.../node_modules/react-doctor/dist/record-metric-CJxSHfJD.js:75822:21)
at file:///.../node_modules/react-doctor/dist/record-metric-CJxSHfJD.js:75926:28
at Array.flatMap ()
at parseOxlintOutput (file:///.../node_modules/react-doctor/dist/record-metric-CJxSHfJD.js:75923:68)
at spawnLintBatch (file:///.../node_modules/react-doctor/dist/record-metric-CJxSHfJD.js:76206:12)

Root Cause

The error occurs at parseRuleCode in the bundled oxlint output parser:

const parseRuleCode = (code) => {
    const match = code.match(/^(.+)\((.+)\)$/);  // ← crashes when code is undefined
    if (!match) return { plugin: "unknown", rule: code };
    return { plugin: match[1].replace(/^eslint-plugin-/, ""), rule: match[2] };
};

Some oxlint diagnostics don't include a code field, so diagnostic.code is undefined. When parseRuleCode(undefined) is called, .match() throws.

Fix

Add a null check before calling .match():

const parseRuleCode = (code) => {
    if (!code) return { plugin: "unknown", rule: "unknown" };
    const match = code.match(/^(.+)\((.+)\)$/);
    // ...
};

Environment

• react-doctor: 0.9.11
• Node.js: v24.15.0
• OS: macOS (Darwin)
• Project: Astro SSR + React islands (TypeScript 6.0.3)
• Command: npx react-doctor@latest . --verbose --diff

[aidenybai]

fixing

[react-doctor-evals]

✅ Triage opened a PR: #1637 — trace bae433b77390582ff1a5d97f9d7f88a1