[TypeScript] Represent Non-Primitive Types with TypeScript’s object Type

Posted 2020-10-13 Answer1215

ypeScript 2.2 introduced the object, a type that represents any non-primitive type. It can be used to more accurately type methods such as Object.create. Don\'t confuse it with the Object type or {}, the empty object type, though!

 

So one thing we need to understand that the Primitive types includes: \'number, boolean, string, symbol, null, undefined\'. The \'array, {}, fn()\' belongs to \'object\' type. The \'object\' type therefore is different from \'Object\' type in typescript. \'Object\' type is referring empty object ( {} ).

 

 Type \'Object\' gives autocomplete. It includes all the methods which an empty object can have.

 But empty object without Object type has not.

 

If we try to assign a value to empty object, we get error:

In order to do it, we can do:

const object: { [key: string]: any } = {};
object.foo = \'bar\';