Which approach makes more sense when transitioning from dynamically typed languages to TypeScript: starting a brand new TypeScript project from scratch or gradually converting existing JavaScript code? What are the advantages and disadvantages that support your preference?
What path would you recommend for getting started with TypeScript?
👁️ 3 views💬 2 replies❤️ 0 likes
2 Replies
Why do people even wonder whether they should integrate TypeScript from the start into a project instead of gradually? Especially with large codebases, wouldn’t a smooth transition make more sense—or am I missing something?
I would definitely recommend a gradual migration, especially if you have an existing JavaScript project. In my last codebase (a larger web UI project), the transition was exactly like this—we converted around 60% of the code to TypeScript without stopping the project. The biggest advantage? Runtime errors caused by missing or incorrect typing almost completely disappear, and developers can immediately benefit from better autocomplete support in IDEs. Even the team onboarding time shortened significantly because new colleagues had to ask "who just typed what?" questions far less often.
Of course, there are also challenges: Typings for external libraries can be annoying (often requiring `@types/` packages or custom definitions), and you have to adjust debugging sessions since TypeScript errors can sometimes look surprisingly nasty at first. But in the long run, you save endless `console.log` debugging sessions—the switch definitely pays off after a few weeks. One of my colleagues even said, "Now I finally understand how our own framework actually works!"—that says a lot.