The Top 30 Libraries Claude Opus 4.7 Actually Imports

We parsed imports across every source file in the 9,281-repo Claude Opus 4.7 corpus and counted raw usage. Not declared in package.json — actually imported from source code.

Top 30 by usage count

Rank Library Imports
1 react 45,938
2 lucide-react 16,221
3 __future__ (Python) 14,070
4 typing (Python) 13,363
5 os (Python) 10,744
6 @/lib/utils (shadcn) 9,382
7 json (Python) 9,064
8 pathlib (Python) 8,962
9 time (Python) 7,875
10 datetime (Python) 7,513
11 next/server 7,071
12 @/components/ui/button 6,828
13 next/link 6,739
14 sys (Python) 6,713
15 logging (Python) 6,013
16 next/navigation 5,926
17 path (Node) 5,133
18 re (Python) 4,933
19 dataclasses (Python) 4,596
20 fmt (Go) 4,385
21 fs (Node) 4,165
22 framer-motion 3,790
23 @/components/ui/card 3,684
24 @tanstack/react-query 3,418
25 @/components/ui/badge 3,371
26 react-router-dom 3,265
27 argparse (Python) 3,248
28 numpy 3,247
29 zod 3,191
30 strings (Go) 3,170

What this reveals

React is truly dominant

45,938 react imports across ~9K repos is ~5 imports per repo. Every third file on average imports React. This is fine-tuning gold — the model has effectively infinite positive examples.

Python types are deeply adopted

typing appears 13,363 times — more than os or json. Opus 4.7 writes typed Python by default. __future__ at 14,070 confirms it (imports like from __future__ import annotations).

shadcn is a first-class stack component

@/lib/utils (9,382), @/components/ui/button (6,828), @/components/ui/card (3,684), @/components/ui/badge (3,371) — these four path patterns alone account for ~23K imports. That’s a level of ecosystem buy-in usually reserved for standard library modules.

Next.js App Router > Pages Router

next/server (7,071), next/link (6,739), next/navigation (5,926) are App-Router-era APIs. next/router (Pages Router) barely registers.

Modern Python over legacy Python

  • pathlib (8,962) >>> manual os.path string manipulation
  • dataclasses (4,596) instead of plain classes for data structures
  • typing (13,363) for type hints

Validation: Zod for TypeScript, Pydantic-equivalent patterns for Python

zod is the clear winner in TS-land. Yup doesn’t appear in the top 30.

What’s notably missing

  • Redux / Zustand — never crack the top 30. @tanstack/react-query (server state) dominates.
  • Jest — Vitest appears in 394 repos as a framework; Jest only 95. Vitest is default.
  • Axios — native fetch + next/server handle HTTP in Next.js repos; explicit HTTP client imports are rare.
  • Moment.js — date handling is usually inline with Date or datetime; Moment barely appears.
  • Express middleware ecosystem — despite Express being present in 130 repos, middleware libraries don’t crack the top 30, suggesting Opus writes thin Express apps.

Comparison to what Opus 4.7 declares

In workspace package names (pnpm monorepo naming convention):

Package name Manager Repos
web pnpm 29
backend pip 24
shared pnpm 20
python pip 13
ui pnpm 12
db pnpm 12
core pnpm 11
api pnpm 11
cli pnpm 8
types pnpm 8
config pnpm 7

pnpm workspaces dominate, with an almost-standardized layout: web/, ui/, shared/, api/, db/, core/. This is the Opus 4.7 scaffold signature.

These are live counts. A 30-min-refresh cron updates them whenever new Opus 4.7 repos arrive.