defining two objects in TypeScript with different property sets and assigning them to each other.defining two objects in TypeScript with different property sets and assigning them to each other.Typescript embraces structural typing, allowing for easy comparison of object types. When determining if object type B is a subtype of object type A, any extra properties in B are disregarded. Typescript has a clever feature that detects when type B is created as an object literal, known as fresh object literals. These fresh object literals are explained here. The reasoning behind this is to identify potential typos in excess properties. However, if type B can be derived from various objects and not just object literals, the standard structural typing rules apply without issuing a warning.
The error message provides all the necessary information.
The reason for the failure in the first case is that an "[o]bject literal may only specify known properties", and c is not a recognized property of a.
In contrast, the second case is successful because b is not presented as an object literal, so the aforementioned rule does not apply.
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