Typescript: check if value is contained in type

Question

I have problem with defined types and checking if a value is contained in that type.

Here is my example:

these are the types:

export type Key         


        

Answer 1

This answer to a similar question might be useful. it doesn't exactly answer your question, but it shows a similar way to achieve the desired result.

In short, you can use array for inclusion checks, and type for type safety:

const keys =  ['features','special'];
export type Key = typeof keys[number];
const tabTypes =  ['info' ,'features' ,'special', 'stars'];
export type TabTypes = typeof tabTypes[number];

activeTabChanged(event: TabTypes) {
    this.activeTab: TabTypes = event;
    // it won't let me set the key here because key has a different type 
    // but the send event can be contained in type Key
    // how can I check if the send event from type TabTypes is contained in type Key

    if (event in keys) {
        this.key: Key = event as Key;
    }
}