Is it possible to create a modified Array derivative with a different index signature than the original?
One potential example could be:
interface SaferArray<T> extends Array<T> {
[i: number]: T | undefined
}
However, there seems to be an error:
Error: Interface incorrectly extends interface 'T[]'.
Index signatures are incompatible.
Type 'T | undefined' is not assignable to type 'T'.
To make this safer, you could use a type alias like the following example:
type SafeArray<T> = Array<T | null>;
const sample: SafeArray<number> = [5];
const x = sample[0]; // number | null
const y = sample[1]; // number | null
If you want to extend the type, don't forget to include | null in the extension as shown below:
interface SafeArray<T> extends Array<T | null> {
[i: number]: T | null
}
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