What does “keyof typeof” mean in TypeScript?

Question

Example:

Explain to me what keyof typeof means in TypeScript

enum ColorsEnum {
    white = \'#ffffff\',
    black = \'#000000\',
}

type         


        

Answer 1

For finding the type of any values we use typeof operation. For eg

const user = {
   getPersonalInfo(){},
   getLocation(){}
}

Here user is a value so here typeof operator comes in handy

type userType = typeof user

Here userType gives type information that user is an object which have two properties getPersonalInfo and getLocation and both are functions return void

Now if you want to find the keys of user you can use keyof

type userKeys = keyof userType

which says userKeys= 'getPersonalInfo'| 'getLocation'

Beware if you try to get user's key like type userKeys = keyof user you will get an error 'user' refers to a value, but is being used as a type here. Did you mean 'typeof user'?