type definitions don't work for tuple types

sindresorhus / arrify

Convert a value to an array

MIT License

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type definitions don't work for tuple types #10

Closed ajafff closed 5 years ago

ajafff commented 5 years ago

declare let tuple: [number, string];

const arrified = arrify(tuple);
arrified.push(1);
arrified[0] = 'foo'

Since tuples are arrays, they are returned as is. The type declarations however widen the type to a regular (mutable) array type. Both mutations above should not be allowed.

BendingBender commented 5 years ago

Any suggestions on how to fix this?