---
title: "Discussion on \"Claude Code for TypeScript Migrations: How I Converted a 200,000-Line JavaScript Codebase Without Stopping Shipping\" | Hashnode"
description: "Discussion on \"Claude Code for TypeScript Migrations: How I Converted a 200,000-Line JavaScript Codebase Without Stopping Shipping\". The first time I tried to migrate a large JavaScript codebase to TypeScript, I made the classic mistake. I planned a six-week migration project, kicked off with a team meeting, started at the top of the directory tree, and got about 4% through before..."
url: "https://hashnode.com/posts/claude-code-for-typescript-migrations-how-i-converted-a-200000-line-javascript-codebase-without-stopping-shipping/6a01d5f857ec775c2e09d7db"
---

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# [Claude Code for TypeScript Migrations: How I Converted a 200,000-Line JavaScript Codebase Without Stopping Shipping](https://nextools.hashnode.dev/claude-code-for-typescript-migrations-how-i-converted-a-200000-line-javascript-codebase-without-stopping-shipping?utm_source=hashnode&utm_medium=feed)

The first time I tried to migrate a large JavaScript codebase to TypeScript, I made the classic mistake. I planned a six-week migration project, kicked off with a team meeting, started at the top of the directory tree, and got about 4% through before...

May 11 · 16 min read · nextools.hashnode.dev  
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