TypeScript Is Not a JavaScript Superset
You read that correctly: TypeScript is not a JavaScript superset. This misconception is one of the biggest errors in software engineering today. Let’s clear up the confusion by starting with what a superset actually means: Superset: A programming language that includes all the features of another language and adds new features to enhance or expand it. For example, Objective-C is a superset of C. It contains all the features of C and adds new capabilities, such as object-oriented programming with classes and messaging. Consequently, valid C code is also valid in Objective-C without modification. Now, let’s contrast this with TypeScript. When you try to use perfectly valid JavaScript code in a TypeScript project, you often encounter "errors" and "issues" that didn’t exist before. This isn’t merely a matter of different syntax or semantics; it often requires significant changes to make the code work in TypeScript. In practice, adapting JavaScript code to ...