javascript - In Typescript, what is the difference between type and interface? -

what differences between following?

type foo = {      foo: string  }; interface foo {    foo: string; } 

interfaces can extended

interface {   x: number; } interface b extends {   y: string; } 

and augmented

interface c {   m: boolean; } // ... later ... interface c {   n: number; } 

type aliases, however, can represent things interfaces can't

type numorstr = number | string; type neatandcool = neat & cool; type justsomeothername = sometype; 

so in general if have plain object type, shown in question, interface better approach. if find wanting write can't written interface, or want give different name, type alias better.