Borrowing it
Nothing to install: this file belongs to JubaKitiashvili/everything-react-native-expo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/JubaKitiashvili/everything-react-native-expo/main/CLAUDE.mdgit clone --depth 1 https://github.com/JubaKitiashvili/everything-react-native-expoWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/jubakitiashvili/everything-react-native-expo/claude-md)<a href="https://agentmods.dev/instructions/jubakitiashvili/everything-react-native-expo/claude-md"><img src="https://agentmods.dev/badge/instructions/jubakitiashvili/everything-react-native-expo/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/jubakitiashvili/everything-react-native-expo/claude-md"><img src="https://agentmods.dev/badge/instructions/jubakitiashvili/everything-react-native-expo/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.03185 | $0.03185 |
| Opus 5.5 | $0.01274 | $0.01274 |
| Sonnet 5.5 | $0.00637 | $0.00637 |
| Haiku 4.5 | $0.00318 | $0.00318 |
Grade A, and why
everything-react-native-expo CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ERNE — Everything React Native & Expo
You are working in an ERNE-powered React Native/Expo project.
Project Stack
Note: When
erne initruns in a project, this section is replaced with a stack summary generated from deep detection of the project's actual dependencies (state management, navigation, styling, lists, images, forms, storage, testing, build system).
- Framework: React Native with Expo (managed or bare)
- Language: TypeScript (strict mode)
- Navigation: Detected at init (Expo Router, React Navigation, etc.)
- State: Detected at init (Zustand, Redux Toolkit, MobX, etc.)
- Testing: Jest + React Native Testing Library + Detox
- Styling: Detected at init (StyleSheet.create, NativeWind, etc.)
Documentation Verification
When working with Expo or React Native APIs:
- If context7 MCP is available — always verify API usage against current docs before writing code (
resolve-library-id→query-docs) - If context7 is not available — note in comments that API usage should be verified against current docs
- Agent training data has a fixed cutoff — newer APIs, deprecations, and breaking changes may not be known. The
.claude/rules/files are auto-maintained by the knowledge updater but always prefer live docs when available.
Key Rules
Code Style
- Functional components only with
const+ arrow functions - PascalCase for components, camelCase for hooks/utils, SCREAMING_SNAKE for constants
- Named exports only (no default exports)
- Group imports: react → react-native → expo → external → internal → types
- Max component length: 250 lines — extract if larger
Performance
- Memoize with
React.memo,useMemo,useCallbackwhere measurable - Use
FlashListoverFlatListfor large lists (100+ items) - Avoid anonymous functions in JSX render paths
- Optimize images: WebP format, resizeMode, caching
- Keep JS bundle under 1.5MB
Testing
- Every new component/hook needs a test file
- Test user behavior, not implementation details
- Mock native modules at
__mocks__/level - E2E critical paths with Detox
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 233 lines · 3,185 tokens per session scan A 625256508206
everything-react-native-expo CLAUDE.md is an instructions file published in the GitHub repository JubaKitiashvili/everything-react-native-expo (48 stars, last pushed 2d ago), licensed MIT. It adds 3,185 tokens to every session, about $0.0127 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-09.
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