When you start using TypeScript in real-world projects, you often encounter the need to integrate it into an existing JavaScript codebase. This process is both practical and incremental, allowing you to gain the benefits of type safety and improved tooling without needing to rewrite your entire project from scratch. The typical workflow involves configuring TypeScript alongside your current JavaScript files, gradually renaming files from .js to .ts, and adding type annotations where they provide the most value. Many teams begin by introducing TypeScript to new features or critical modules, gaining confidence before expanding its use throughout the codebase.

As you adopt TypeScript, you may face challenges such as configuring build tools, updating third-party dependencies, and learning how to write effective type annotations. One best practice is to enable strict type checking early, as this helps catch potential issues before they reach production. It is also important to use gradual migration strategies, such as allowing JavaScript and TypeScript to coexist and converting files one at a time. Additionally, leveraging TypeScript's extensive documentation and community resources can help you solve issues quickly and stay up-to-date with recommended patterns.