To find the union of types of values associated with numeric keys, the number type must be used.
const animals = ['dog', 'cat', 'hen'] as const
type Animal = typeof animals[number] // type Animal = "dog" | "cat" | "hen"
But what exactly is this number? Is it a type, constant, or some other keyword?
A numeric value is a data type used to represent floating-point numbers in TypeScript.
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