Has anyone encountered a problem similar to this?
type B = a ? 'apple' | 'grape' | 'orange' : 'apple' | 'grape'; // This code results in an ERROR!
const x = (a: boolean, b: B) => console.log('foo')
Any suggestions on how to tackle this issue? Can it be achieved using Typescript?
A solution to this problem involves utilizing generics along with conditional types. Here is an example code snippet:
type Fruit = "apple" | "grape" | "orange";
type Selection = "apple" | "grape";
const checkSelection = <B extends boolean>(boolVal: B, selectedFruit: B extends true ? Fruit : Selection) =>
console.log("Checking selection");
checkSelection(false, "orange"); // produces an error
checkSelection(true, "orange"); // does not produce an error
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