Monorepo lint and typecheck migration

Claude Code migrated a 7-app, roughly 1,670-file TypeScript monorepo from Biome and tsc to oxlint, oxfmt and tsgo, fixing code to meet new rules.

Resultrc_1PNSDCZ2

Combined lint and typecheck time fell from 29.04s to 1.25s, about 23 times faster, with no memory config needed for typechecking.

NumbersBlog · Apr 28 · Last checked Oct 13, 2026

Overview

How it was set up

Claude Code with a maintained CLAUDE.md. Separate PRs per phase for oxlint and tsgo. Lint, typecheck and tests ran after each step. Timings measured before and after.

Worth knowing

The author notes the real work was adjusting code to the new lint rules, such as import order, and stricter tsgo types.

A prompt to start from

The source does not show the prompt.

Sources 1

Originalsergioazocar.com/en/blog/how-to-migrate-with-claude-code-and-not-die-trying

History

Source published: 2026-04-28
Added to Agentic Feats: 2026-10-13
Pick: No
Markdown copy: /c/monorepo-lint-and-typecheck-migration-claude-code.md

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