Typescript interface syntax

Typescript offers two distinct flavours for declaring the same syntax. Both of these interfaces are identical:

The reason for providing these two ways is because :

C# / classic languages people would like the first syntax as that is how they would most likely use the interface:

The JavaScript folk might prefer the second syntax for it resembles JSON object syntax:

Since types are structural in typescript instace1 can be used anyplace where instance2 can be used.

Have a play here.