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facebook/react

6,981 files 16 languages 1,014,824 total lines @098d2e8 analysed just now
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01Overview

react · 833,213 lines of actual code
6,981
Files
833,213
Code lines
79,965
Comments
16
Languages
75,137
Complexity
1
Secrets
Line Composition 1,014,824 total lines
Code833,21382.1%
Blank101,64610.0%
Comments79,9657.9%
~99%
tokens saved
Reading facebook/react via an LLM
~5.8M tokens → ~1.4k tokens via code_analyze

The entire repo summarised by code_analyze — structured JSON in <2k tokens. The dossier above is built from one call. Drill into specifics with code_search.

02Languages & Tech Stack

what it’s written in, what it depends on

Language Breakdown

Language
Files
Code
Share
JavaScript
3,836
537,057
64.5%
Markdown
2,019
131,361
15.8%
TypeScript
526
68,884
8.3%
Rust
121
65,568
7.9%
JSON
152
17,590
2.1%
CSS
108
4,519
0.5%
HTML
79
3,242
0.4%
YAML
31
3,001
0.4%
CoffeeScript
1
476
0.1%
+ 7 more
—
1,192
·

Tech Stack  (35 detected)

React 1477 Node.js Path 133 Node.js File System 95 Node.js Child Process 38 Jest 35 Chalk 31 Node.js Events 23 Webpack 22 Serde 19 React Native 14 Node.js OS 11 Node.js HTTP 9 Express.js 8 Cypress / Playwright 7 Zod 7 Redux 6 Testing Library 6 Node.js Crypto 5 Electron 3 Inquirer 3 Puppeteer 3 Rollup 3 Next.js (React Framework) 2 Browser Fetch API 1 Cheerio 1 Lodash 1 Model Context Protocol SDK 1 RxJS 1 Tailwind CSS 1 dotenv 1 esbuild 1 Rust Standard Library 54 modules

03Notable Files

where complexity and size live

Most Complex

FileLinesCx
packages/react-devtools-shared/src/backend/fiber/renderer.js6,4302,152
packages/react-dom-bindings/src/server/ReactFizzConfigDOM.js5,9831,459
packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js5,7041,430
packages/react-server/src/ReactFlightServer.js5,5631,426
packages/react-reconciler/src/ReactFiberCommitWork.js4,5021,194
packages/react-client/src/ReactFlightClient.js4,7211,179
packages/react-server/src/ReactFizzServer.js5,3111,165
packages/react-dom-bindings/src/client/ReactDOMComponent.js3,0281,117
packages/react-reconciler/src/ReactFiberWorkLoop.js4,220999
scripts/bench/benchmarks/pe-class-components/benchmark.js5,400996

Largest

FileLinesCx
fixtures/attribute-behavior/AttributeTableSnapshot.md13,3920
fixtures/ssr2/package-lock.json12,8270
packages/react-dom/src/__tests__/ReactDOMFloat-test.js9,45573
packages/react-dom/src/__tests__/ReactDOMFizzServer-test.js9,410141
packages/eslint-plugin-react-hooks/__tests__/ESLintRuleExhaustiveDeps-test.js8,5397
compiler/crates/react_compiler_lowering/src/build_hir.rs6,695958
packages/react-devtools-shared/src/backend/fiber/renderer.js6,4302,152
packages/react-dom-bindings/src/server/ReactFizzConfigDOM.js5,9831,459
packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js5,7041,430
packages/react-server/src/ReactFlightServer.js5,5631,426

04Code Quality

style, correctness, and maintainability findings

By Severity & Category

Warning
1116
Info
2042
Error
3
Total
3,161
By Category
accessibility 118 correctness 2436 maintainability 69 performance 498 security 40

Top Findings

Universal selector detected; avoid for performance and specificity issues
compiler/apps/playground/styles/globals.css:56
Use of !important detected; avoid overriding specificity with safer cascade management
compiler/apps/playground/styles/globals.css:142
Warning: Direct indexing (e.g., `vec[i]`, `slice[i]`) panics on out-of-bounds access. Prefer using `.get(index)` or `.get_mut(index)` which return Option<&T>/Option<&mut T>. ×3
compiler/crates/react_compiler/src/debug_print.rs:152 + 2 more

05Secrets & Credentials

pattern-based scan for hardcoded secrets
generic-api-key — Detected a Generic API Key, potentially exposing access to various services and sensitive operations.
compiler/packages/react-mcp-server/src/utils/algolia.ts:14

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