The lab book

Repro log

The posts here are written from scripts that anyone can run. Each script lives in nils44344/nk-repro, and most run on GitHub Actions, so every run, its machine and its full log stay public. This page lists them: 87 repro folders behind 84 posts, with 96 successful Actions runs for the 53 that run there.

Checked every day

These posts' main claims are re-checked automatically each day on the newest versions. If a check stops holding, the post gets re-tested.

ESLint "couldn't find an eslint.config.* file" (ESLint 10)3 checks · all hold · Nov 4, 2026 · run
Drizzle "Failed query" error: find the real cause4 checks · all hold · Nov 4, 2026 · run
Prisma P1012: "url is no longer supported in schema files"6 checks · all hold · Nov 4, 2026 · run
Next.js 16.3 vulnerabilities: which version is patched?4 checks · all hold · Nov 4, 2026 · run
Bun "error: Cannot find module": every cause, tested16 checks · all hold · Nov 4, 2026 · run
prisma generate not working: "No command registered" (Prisma 8)4 checks · all hold · Nov 4, 2026 · run

Every check and its evidence →

Every repro folder

agents-windows1 run · last Nov 3, 2026
Claude Code, Codex, Gemini CLI on Windows: install tested
bun-check2 runs · last Nov 3, 2026
bun check vs tsc: TypeScript type-check speed, tested
bun-vs-node1 run · last Nov 3, 2026
Bun vs Node.js 24 benchmark: startup, TypeScript and tests
deno-deploy-move1 run · last Nov 3, 2026
Leaving Deno Deploy
esm-dirname2 runs · last Nov 3, 2026
require / __dirname is not defined
install-speed3 runs · last Nov 3, 2026
npm vs pnpm vs Yarn vs Bun: install speed benchmark (2026)
pkg-resources3 runs · last Nov 3, 2026
No module named 'pkg_resources'
sveltekit-32 runs · last Nov 3, 2026
SvelteKit 3 migration, tested: what sv migrate misses
anthropic-auth2 runs · last Nov 2, 2026
Anthropic auth method error
api-connection-error1 run · last Nov 2, 2026
APIConnectionError: Connection error.
claude-auth1 run · last Nov 2, 2026
Claude Code: Invalid API key
codex-stdin1 run · last Nov 2, 2026
Codex: stdin is not a terminal
eaddrinuse-windows4 runs · last Nov 2, 2026
EADDRINUSE
ebusy-windows1 run · last Nov 2, 2026
EBUSY: resource busy or locked
esbuild-dynamic-require1 run · last Nov 2, 2026
Dynamic require of "fs" is not supported
etarget1 run · last Nov 2, 2026
npm ETARGET
mcp-320002 runs · last Nov 2, 2026
MCP error -32000: Connection closed
missing-script1 run · last Nov 2, 2026
npm error Missing script: "dev"
not-recognized2 runs · last Nov 2, 2026
'x' is not recognized (Windows)
npm-ci-eusage1 run · last Nov 2, 2026
npm ci EUSAGE
openai-4011 run · last Nov 2, 2026
OPENAI_API_KEY missing or empty
openai-key1 run · last Nov 2, 2026
OPENAI_API_KEY missing or empty
puppeteer-chrome3 runs · last Nov 2, 2026
Puppeteer: Could not find Chrome
py310-to-3141 run · last Nov 2, 2026
Python 3.15 on Windows: which packages install (tested)
rolldown-binding1 run · last Nov 2, 2026
Rolldown native binding missing
sqlite-bindings1 run · last Nov 2, 2026
Could not locate the bindings file
supabase-cli-32 runs · last Nov 2, 2026
Supabase CLI 3 tested
tailwind-init2 runs · last Nov 2, 2026
npx tailwindcss init failing
tailwind-postcss1 run · last Nov 2, 2026
Failed to load PostCSS config
ts-strip-only1 run · last Nov 2, 2026
Not supported in strip-only mode
ts7-frameworks7 runs · last Nov 2, 2026
Does NestJS, Next.js, Angular or Vue work with TypeScript 7? · Angular compilation initialization failed
ts7-migration1 run · last Nov 2, 2026
TypeScript 7 migration guide: breaking changes, tested
tseslint-ts71 run · last Nov 2, 2026
typescript-eslint vs TS 7.0
vite-postcss-config3 runs · last Nov 2, 2026
Failed to load PostCSS config
vitest53 runs · last Nov 2, 2026
Vitest 4 to 5 migration: 6 breaking changes, tested
claude-exe-npm121 run · last Nov 1, 2026
claude.exe not compatible with Windows
import-outside-module2 runs · last Nov 1, 2026
Cannot use import statement outside a module
npm12-breaking1 run · last Nov 1, 2026
npm 12 breaking changes, tested: what actually breaks
ossl-evp6 runs · last Nov 1, 2026
error:0308010C
pep6683 runs · last Nov 1, 2026
externally-managed-environment
punycode1 run · last Nov 1, 2026
punycode module is deprecated
vite-process1 run · last Nov 1, 2026
process is not defined (Vite)
bigint-bindings1 run · last Oct 31, 2026
bigint: Failed to load bindings
eresolve1 run · last Oct 31, 2026
npm ERESOLVE
require-esm1 run · last Oct 31, 2026
ERR_REQUIRE_ESM
unexpected-export1 run · last Oct 31, 2026
Cannot use import statement outside a module
vite-alias2 runs · last Oct 31, 2026
Vite Failed to resolve import
worker-handlers2 runs · last Oct 31, 2026
No registered event handlers (10068)
dockerperm1 run · last Oct 20, 2026
Docker daemon socket: permission denied
p20022 runs · last Oct 18, 2026
P2002: Unique constraint failed
pgauth4 runs · last Oct 18, 2026
password authentication failed (Postgres)
distutils1 run · last Oct 16, 2026
No module named 'distutils'
certs3 runs · last Oct 15, 2026
self-signed certificate in chain
anthropic-sdk2run locally (output in the folder)
Claude SDK: unexpected keyword argument
bun-cannot-find-modulerun locally (output in the folder)
Bun: Cannot find module
claude-temperaturerun locally (output in the folder)
Claude: temperature is deprecated
drizzle-failed-queryrun locally (output in the folder)
Drizzle: Failed query
eaccesrun locally (output in the folder)
npm error code EACCES
eallowremoterun locally (output in the folder)
npm error code EALLOWREMOTE
eslint10run locally (output in the folder)
ESLint: no eslint.config file
gemini-429run locally (output in the folder)
Gemini model no longer available · Gemini 429 RESOURCE_EXHAUSTED
libatomicrun locally (output in the folder)
libatomic.so.1: cannot open shared object file
modnfrun locally (output in the folder)
No module named X, but pip installed it
native-bindingrun locally (output in the folder)
Rolldown native binding missing
next-securityrun locally (output in the folder)
Next.js 16.3 security updates
node26run locally (output in the folder)
Node 26 vs Node 24: what breaks when you upgrade, tested
npm-enoentrun locally (output in the folder)
npm error code ENOENT
npm-versionsrun locally (output in the folder)
npm warn EBADENGINE · npm error Invalid Version
openai-chatcompletionrun locally (output in the folder)
openai has no attribute 'ChatCompletion'
openai-responses-paramsrun locally (output in the folder)
Responses.create() unexpected keyword argument
openai-shutdownrun locally (output in the folder)
OpenAI models shut down Oct 23
prisma-cirun locally (output in the folder)
No command registered for `generate`
prisma-initrun locally (output in the folder)
P1001: Can't reach database server · No command registered for `generate`
prisma-noinitrun locally (output in the folder)
@prisma/client did not initialize yet
prisma-p1012run locally (output in the folder)
Prisma P1012: url no longer supported
prisma6-noinitrun locally (output in the folder)
P1001: Can't reach database server · @prisma/client did not initialize yet
proxiesrun locally (output in the folder)
Responses.create() unexpected keyword argument
py315run locally (output in the folder)
torch: from versions: none · Visual C++ 14.0 required · Python 3.15 on Windows: which packages install (tested)
pystubrun locally (output in the folder)
Python was not found / pip not recognized
pyyamlrun locally (output in the folder)
Visual C++ 14.0 required
ssl-verifyrun locally (output in the folder)
Python CERTIFICATE_VERIFY_FAILED
starters-windowsrun locally (output in the folder)
Framework starters on Windows
supabase-42501run locally (output in the folder)
Supabase 42501
swc-winrun locally (output in the folder)
Framework starters on Windows
ts7-retestrun locally (output in the folder)
TypeScript 7 with ts-jest, ESLint, ts-node: 9 tools tested · ts-node fileExists crash
ts71run locally (output in the folder)
TypeScript 7.1 beta tested
tw-unknown-utilityrun locally (output in the folder)
Cannot apply unknown utility class