How to define static variables in TypeScript [duplicate]

Question

I want to define an array with a constant value e.g. const arr = ["a", "b"];. However, the compiler will think it's string[]. Is there is a way to make it a constant type as is so the type of arr should be ["a", "b"]. The only way I found was to do like: const arr: ["a", "b"] = ["a", "b"];. but it's like code duplication.

Mr. Polywhirl · Accepted Answer · 2023-07-31 14:02:25Z

1

You could define it as a read-only constant. Keep in mind that a constant can never be reassigned anyways.

const CHOICES = ['a', 'b'] as const;

answered Jul 31, 2023 at 14:02

Mr. Polywhirl

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