Typescript has a concept called ‘Declaration Merging’. The idea is that some kinds of declarations can be specified multiple times, and the ‘final’ or ‘actual’ value is the result of those combined declarations:
interface A { name: string }
interface A { age: number }Here, we declare using declaration merging to define an interface that is the same as:
interface A { name: string; age: number }This is really useful for writing code along with contextual, but global type information. Consider this example of…
