![]() The code below defines an interface for a “user” object and a method that is supposed to get the user’s age. ![]() To be more explicit, the user of such a type checker can support the system by manually declaring types - to inform both human and machine how the program is supposed to behave. A static type checker does not modify how your code behaves at runtime - instead, it analyzes your code and attempts to infer types wherever possible, warning the developer before code ships.Ī static type checker understands that Math.random() returns a number, which does not contain the string method toLowerCase(). To improve our situation, we decided to give static type checking a shot. In complex systems with countless modules and dependencies, it’s entirely possible to break a function without ever opening the file it lives in. You have to trust that the person who wrote the code documented it correctly and that people who changed it later correctly updated the documentation. Looking at the code, it’s hard to know what a JavaScript promise resolves with. In the past, we used JSDoc to document our function signatures, using comments to inform code wanderers about the purpose and proper usage of classes, functions, and variables. Given how quickly static type checking is gaining traction, we wanted to share our experiences and practices. It’s not just us, either: In the 2017 StackOverflow Developer Survey, TypeScript was the third most-loved programming technology. ![]() To that end, we adopted TypeScript (a statically typed superset of JavaScript) and quickly learned to stop worrying and love the compiler. In the desktop world, a small mistake is likely to result in an application crash. Managing large JavaScript codebases is challenging - whenever we casually pass objects from Chrome’s JavaScript to Objective-C just to receive a callback on a different thread in Node.js, we need a guarantee that the individual pieces fit together. When Brendan Eich created the very first version of JavaScript for Netscape Navigator 2.0 in merely ten days, it’s likely that he did not expect how far the Slack Desktop App would take his invention: We use one JavaScript code base to build a multi-threaded desktop application, routinely interacting with native code, targeting Windows, macOS, and Linux.
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