Transform a literal string type definition into a string value (similar to the typeof operator), or is it the other way around in TypeScript?

Is there a way to retrieve the string value of a string literal type without having to define it twice, similar to the typeof operator in C#?

myStringLiteral: 'STRING TYPE';

myString: string = typeof(myStringLiteral); // I want myString to be equal to 'STRING TYPE'...

Alternatively, is it possible to do the opposite:

const myString: string =  'STRING TYPE';

myStringLiteral: myString;

Answer №1

In order to allow the compiler to infer the string literal type for the constant, you should refrain from using an explicit type annotation (or alternatively specify a different string literal type beyond just 'string').

If you accurately declare the constant myString, you can simply employ typeof to ascertain the type of the constant within a type annotation or type definitions:

const myString = 'STRING TYPE'; // defined as 'STRING TYPE'

type myStringLiteral = typeof myString; // myStringLiteral becomes 'STRING TYPE'

let otherVar: typeof myString;

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