Beyond the JS compatibility, having a language with a more feature-rich static type system than Java, but which can step down into dynamic-land on a whim, makes

Beyond the JS compatibility, having a language with a more feature-rich static type system than Java, but which can step down into dynamic-land on a whim, makes for an amazing developer experience. Every new project I start is in TypeScript because its type system will help me exactly as much as I want it to.