How do I check that a switch block is exhaustive in TypeScript?

Question

I have some code:

enum Color {
    Red,
    Green,
    Blue
}

function getColorName(c: Color): string {
    switch(c) {
        case Color.Red:
                     


        

Answer 1

To avoid Typescript or linter warnings:

    default:
        ((_: never): void => {})(c);

in context:

function getColorName(c: Color): string {
    switch(c) {
        case Color.Red:
            return 'red';
        case Color.Green:
            return 'green';
        default:
            ((_: never): void => {})(c);
    }
}

The difference between this solution and the others is

• there are no unreferenced named variables
• it does not throw an exception since Typescript will enforce that the code will never execute anyway