I'm a bit confused about the use of declaration in TypeScript. It seems like the compiler doesn't compile it into the js file, so what is the purpose and advantage of using declaration? Can someone please explain this to me?
I'm a bit confused about the use of declaration in TypeScript. It seems like the compiler doesn't compile it into the js file, so what is the purpose and advantage of using declaration? Can someone please explain this to me?
Consider them like the behind-the-scenes information for the libraries you're incorporating.
These details are crucial for the compiler to determine the validity of your code.
Additionally, they enhance your development experience by providing type information that enables helpful tools like intellisense to assist you.
The intent behind declaration files in Typescript is to keep type definitions separate from JavaScript files, preventing them from becoming cluttered with non-rendering statements.
Additionally, declaration files follow the established practice of segregating statement definitions (metadata) into a distinct file, similar to Header files in languages like C.
The benefit lies in the ability to reuse these definition files across different parts of your platform without overcrowding your javascript files. For example, if you have an application using both NodeJS as backend and BackboneJS as frontend, you can simply include the declaration file for any shared object declarations.
Even if JavaScript is not used as the primary language for your backend and frontend, separating the application structure can serve as a foundation for documentation purposes. Tools such as typedoc.io can extract this information from your declaration files to generate informative documentation.
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