Conversion from both keys and values of object

0 votes

I have two sets of string values that I want to map from one to the other as a constant object. I want to generate two types from that map: 

  • Keys and 
  • Values
const KeyToVal = {
    MyKey1: 'myValue1',
    MyKey2: 'myValue2',
};

The keys are working well

type Keys = keyof typeof KeyToVal;

But I am having trouble with the compile-time type for values.

All of these converted my Values to string. I also tried referring How to infer typed mapValues using lookups in typescript?, but I either got my adaptations wrong, or the answers didn't fit my problem. 

May 30, 2022 in TypeSript by Logan
• 2,140 points
54 views

1 answer to this question.

0 votes

You could just change the declaration of KeyToVal like this:

const KeyToVal = {
    MyKey1: 'myValue1',
    MyKey2: 'myValue2',
} as const; // <----- add the <as const> here

Then you can create the key types:

type Keys = keyof typeof KeyToVal;

Now you can create the types of values:

type ValuesTypes = typeof KeyToVal[Keys];
answered May 31, 2022 by Nina
• 3,020 points

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