A lot of it is described in https://www.typescriptlang.org/docs/handbook/type-compatibility.html https://www.typescriptlang.org/docs/handbook/type-compatibil...

A lot of it is described in https://www.typescriptlang.org/docs/handbook/type-compatibility.html https://www.typescriptlang.org/docs/handbook/type-compatibil... More examples are on https://github.com/Microsoft/TypeScript/wiki/FAQ https://github.com/Microsoft/TypeScript/wiki/FAQ