Typescript: Retrieve element type information from array type
Update: based on @jerico's answer below The following type alias will return the type of the elements in an array or tuple: type ArrayElement<ArrayType extends readonly unknown[]> = ArrayType extends readonly (infer ElementType)[] ? ElementType : never; So these examples would work: type A = ArrayElement<string[]>; // string type B = ArrayElement<readonly string[]>; // string type C = ArrayElement
Is there a `valueof` similar to `keyof` in TypeScript?
I want to be able to assign an object property to a value given a key and value as inputs yet still be able to determine the type of the value. It's a bit hard to explain so this code should reveal the problem: type JWT = { id: string, token: string, expire: Date }; const obj: JWT = { id: 'abc123', token: 'tk01', expire: new Date(2018, 2, 14) }; function print(key: keyof JWT) { switch (key) { case
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