Design an array specifically for runtime using a union type

Imagine I have the following union type:

type Browser = 'Chrome' | 'Firefox'

I am looking to convert this into an array:

const browsers = /* code to change Browser type into ['Chrome', 'Firefox']

The goal is to use it during runtime. Is there a way to achieve this? I attempted using key of, but unfortunately, that did not work.

Answer №1

At the runtime, there are no TypeScript annotations available which means it is impossible to generate an array from a type during runtime.

However, if the goal is to list the browsers just once:

const browsers = ['Chrome', 'Firefox'] as const;
type Browser = typeof browsers[number] // "Chrome" | "Firefox"

Answer №2

It seems like you could benefit from utilizing an enum:

enum Browser {
    Chrome = 'Chrome',
    Firefox = 'Firefox',
}

const browsers = Object.values(Browser);

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