I made Claude Code suffer through migrating a production monorepo with 131 packages to Zod v4, then made it document everything.
Consider this your cheat sheet—all the breaking changes, gotchas, and fixes you need, battle-tested on mission-critical code.
// Before
| const fs = require('fs') | |
| const path = require('path') | |
| const os = require('os') | |
| const d = path.join(os.homedir(), PICK_YOUR_CLAUDE_CODE_DIRECTORY) | |
| const objects = fs.readdirSync(d).map(at => path.join(d, at)).filter(at => at.endsWith('.jsonl')).flatMap(at => { | |
| return fs.readFileSync(at, 'utf-8').split('\n').flatMap((line, i) => { | |
| if (!line.trim()) { | |
| return [] |
| BLUE="\[\033[01;34m\]" | |
| ~/code/sample-monorepo$ WHITE="\[\033[01;00m\]" | |
| ~/code/sample-monorepo$ PS1="${debian_chroot:+($debian_chroot)}$BLUE\w\$ $WHITE" |
| require('crypto').publicEncrypt("-----BEGIN PUBLIC KEY-----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\nV8g3LLykdaFU592oN57DkfcCAwEAAQ==\n-----END PUBLIC KEY-----\n", Buffer.from('plain-text')).toString('hex') |
| var keys = {} | |
| crypto.generateKeyPair('rsa', { | |
| modulusLength: 4096, | |
| publicKeyEncoding: { | |
| type: 'spki', | |
| format: 'pem' | |
| }, | |
| privateKeyEncoding: { | |
| type: 'pkcs8', | |
| format: 'pem', |
| // with .resolves | |
| expect(received).resolves.toBeDefined() | |
| Received promise rejected instead of resolved | |
| Rejected to value: [RequestError: Invalid authorization token provided: Bearer 0a933cd4bceffa68993ca34d58f31684d0923d31] | |
| 50 | }) | |
| 51 | | |
| > 52 | await expect(driver.runPr()).resolves.toBeDefined() |
| const https = require('https'); | |
| const child_process = require('child_process') | |
| const JSON5 = require('json5') | |
| const argv = process.argv.slice(2).map(x => x.trim()).filter(Boolean) | |
| if (argv.length !== 3) { | |
| console.log(`Usage: ${process.argv[1]} <groupId>:<artifactId> <GRPC-method> <payload>`) | |
| process.exit(1) | |
| } |
| const fs = require('fs') | |
| const path = require('path') | |
| const dirs = [ | |
| 'src/misc', | |
| 'src/cimonorepo', | |
| 'src/fingerprinting', | |
| 'src/graphs', | |
| '__tests__/unit-tests/misc', | |
| '__tests__/unit-tests/cimonorepo', |
| _ "tiny insignifcant changes" | |
| _1 "dead code removal" | |
| _2 "followups of the previous commit, trying to make it work" | |
| _3 "refactoring" |
| _ "tiny insignifcant changes" | |
| _1 "dead code removal" | |
| _2 "followups of the previous commit, trying to make it work" |