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refactor: streamline CLAUDE.md for Bun usage and remove outdated instructions

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Victor Noguera
2026-05-19 01:25:17 -04:00
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# CLAUDE.md
Default to using Bun instead of Node.js.
- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
- Use `bun test` instead of `jest` or `vitest`
- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild`
- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install`
- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>`
- Use `bunx <package> <command>` instead of `npx <package> <command>`
- Bun automatically loads .env, so don't use dotenv.
## APIs
- `Bun.serve()` supports WebSockets, HTTPS, and routes. Don't use `express`.
- `bun:sqlite` for SQLite. Don't use `better-sqlite3`.
- `Bun.redis` for Redis. Don't use `ioredis`.
- `Bun.sql` for Postgres. Don't use `pg` or `postgres.js`.
- `WebSocket` is built-in. Don't use `ws`.
- Prefer `Bun.file` over `node:fs`'s readFile/writeFile
- Bun.$`ls` instead of execa.
## Testing
Use `bun test` to run tests. This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
For this project, also use TypeScript's local compiler for type-checking: Default to using Bun instead of Node.js.
- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
- Use `bun test` instead of `jest` or `vitest`
- Use `bun install` instead of `npm install` or `yarn install`
- Use `bun run <script>` instead of `npm run <script>`
- Bun automatically loads .env, so don't use dotenv.
## APIs
- `bun:sqlite` for SQLite. Don't use `better-sqlite3`.
- `Bun.redis` for Redis. Don't use `ioredis`.
- Prefer `Bun.file` over `node:fs`'s readFile/writeFile.
- `Bun.$\`cmd\`` instead of execa.
## Commands
```sh ```sh
# Run all tests
bun test
# Run a single test file
bun test src/supplier-scoring.test.ts
# Type-check (no emit)
./node_modules/.bin/tsc --noEmit ./node_modules/.bin/tsc --noEmit
# ASIN lead-list pipeline (LLM-based)
bun run src/index.ts input/leads.xlsx --out output/results.xlsx
# Supplier UPC pipeline (deterministic)
bun run upc-file --input input/supplier.xlsx --out output/supplier_ranked.xlsx
# Category discovery pipelines
bun run bestsellers
bun run monthly-sold
bun run mid-range
# Web API server
bun run start:web # http://localhost:3000
# SP-API connectivity tests
bun run src/sp-test.ts
bun run src/sp-test.ts B07SN9BHVV
bun run src/sp-test.ts --sellability B07SN9BHVV
``` ```
```ts#index.test.ts
import { test, expect } from "bun:test";
test("hello world", () => {
expect(1).toBe(1);
});
```
## Frontend
Use HTML imports with `Bun.serve()`. Don't use `vite`. HTML imports fully support React, CSS, Tailwind.
Server:
```ts#index.ts
import index from "./index.html"
Bun.serve({
routes: {
"/": index,
"/api/users/:id": {
GET: (req) => {
return new Response(JSON.stringify({ id: req.params.id }));
},
},
},
// optional websocket support
websocket: {
open: (ws) => {
ws.send("Hello, world!");
},
message: (ws, message) => {
ws.send(message);
},
close: (ws) => {
// handle close
}
},
development: {
hmr: true,
console: true,
}
})
```
HTML files can import .tsx, .jsx or .js files directly and Bun's bundler will transpile & bundle automatically. `<link>` tags can point to stylesheets and Bun's CSS bundler will bundle.
```html#index.html
<html>
<body>
<h1>Hello, world!</h1>
<script type="module" src="./frontend.tsx"></script>
</body>
</html>
```
With the following `frontend.tsx`:
```tsx#frontend.tsx
import React from "react";
import { createRoot } from "react-dom/client";
// import .css files directly and it works
import './index.css';
const root = createRoot(document.body);
export default function Frontend() {
return <h1>Hello, world!</h1>;
}
root.render(<Frontend />);
```
Then, run index.ts
```sh
bun --hot ./index.ts
```
For more information, read the Bun API docs in `node_modules/bun-types/docs/**.mdx`.
## asin-check Project Notes ## Architecture
- Keep the existing ASIN lead-list and category flows compatible with their current LLM-based FBA/FBM/SKIP analysis. Two distinct analysis pipelines share infrastructure (Keepa, SP-API, Redis, SQLite) but diverge in how they produce verdicts.
- The supplier UPC workflow is deterministic and runs through `bun run upc-file --input input/supplier.xlsx --out output/supplier_ranked.xlsx`.
- Keep supplier spreadsheets in `input/`, generated workbooks in `output/`, and SQLite files in `db/`; folder contents are ignored by git. ### ASIN Lead-list Pipeline (`src/index.ts` → `src/analysis-pipeline.ts`)
- Supplier UPC files should resolve UPC/EAN values through SP-API catalog lookup first, with Keepa UPC lookup only as fallback for no-match or request-failure cases.
- The supplier pipeline should not call LM Studio. It should enrich with Keepa + SP-API sellability/fees, score BUY/WATCH/SKIP numerically, write an Excel workbook, and persist rows to SQLite. For spreadsheets containing known ASINs. Verdict is LLM-based (FBA/FBM/SKIP via LM Studio).
- Supplier workbook output should keep the `Ranked Leads`, `Skipped`, and `Summary` sheets.
Flow: `reader.ts` parse → Redis cache check → `sp-api.ts` sellability gate (5 concurrent workers) → `keepa.ts` batch enrichment → `sp-api.ts` pricing + FBA fees (5 concurrent workers) → `llm.ts` batched analysis (5 products/batch) → `writer.ts` XLSX + SQLite.
### Supplier UPC Pipeline (`src/upc-file-analysis.ts`)
For supplier price lists containing UPC/EAN values. Verdict is deterministic (BUY/WATCH/SKIP); never calls LM Studio.
Flow: `upc-file-reader.ts` streaming parse (`.xlsx`) or row-window parse (`.xls`) → SP-API catalog UPC lookup first, Keepa UPC lookup as fallback → `keepa.ts` demand enrichment → `sp-api.ts` sellability + FBA fees → `supplier-scoring.ts` deterministic score → `supplier-export.ts` Excel workbook (`Ranked Leads`, `Skipped`, `Summary` sheets) + SQLite.
UPC resolution priority: SP-API catalog lookup → Keepa fallback (for no-match or request failure only).
### Category Pipelines
`bestsellers-by-category.ts`, `top-monthly-sold-by-category.ts`, `mid-range-sellers-by-category.ts` — Keepa category browsing → SP-API sellability gate → LLM verdict. Each saves results to SQLite. Mid-range applies configurable filters (monthly sold, price, seller count, Amazon buy box share).
### Shared Infrastructure
| Module | Role |
|--------|------|
| `src/types.ts` | All shared interfaces (`ProductRecord`, `KeepaData`, `SpApiData`, `SupplierScore`, etc.) |
| `src/config.ts` | Env var loading via `Bun.env` |
| `src/keepa.ts` | Keepa API: batch ASIN fetch, UPC lookup, auto rate-limiting on token exhaustion |
| `src/sp-api.ts` | SP-API: sellability (`getListingsRestrictions`), pricing+fees, UPC catalog lookup |
| `src/cache.ts` | Redis caching (24h TTL for lead-list; 12h for mid-range) |
| `src/database.ts` | SQLite `runs` + `results` tables; auto-creates `db/results.db` |
| `src/server.ts` | Bun HTTP server exposing REST endpoints for both pipelines |
### File Layout
- `input/` — source spreadsheets (git-ignored)
- `output/` — generated workbooks (git-ignored)
- `db/` — SQLite files (git-ignored)
- `src/` — all source and test files
## Project Rules
- Keep the ASIN lead-list and category flows compatible with their current LLM-based FBA/FBM/SKIP analysis.
- The supplier UPC pipeline must not call LM Studio.
- Supplier UPC files resolve UPC/EAN through SP-API catalog lookup first; Keepa UPC lookup is fallback only (no-match or request-failure cases).
- Supplier workbook output must keep `Ranked Leads`, `Skipped`, and `Summary` sheets.
- When changing UPC supplier behavior, cover SP-API UPC parsing, deterministic scoring, and workbook export with `bun test`. - When changing UPC supplier behavior, cover SP-API UPC parsing, deterministic scoring, and workbook export with `bun test`.