I notice the following syntax in Typescript.
export type feline = typeof cat;
As far as I know, type is not a built-in basic type, nor it is an interface or class. Actually it looks more like a syntax for aliasing, which however I can't find reference to verify my guess.
So what does the above statement mean?
This is a type alias - it's used to give another name to a type.
In your example, feline will be the type of whatever cat is.
Here's a more full fledged example:
interface Animal {
legs: number;
}
const cat: Animal = { legs: 4 };
export type feline = typeof cat;
feline will be the type Animal, and you can use it as a type wherever you like.
const someFunc = (cat: feline) => {
doSomething();
};
export simply exports it from the file. It's the same as doing this:
type feline = typeof cat;
export {
feline
};