sort member is missing for ReadonlyArray<T>

[TobiasSekan]

TypeScript Version: 2.4.0

Code

const testArray: ReadonlyArray<string>;
testArray = new Array<string>();
const newArray = testArray.sort();

Expected behavior:
Return a new resorted array

Actual behavior:
ReadOnlyArray have no sort member

[ikatyang]

Array#sort() will affect original array, it is not readonly.

[olegdunkan]

First issue is that you can't assign to const variable except in a declaration.
ReadonlyArray is immutable you can't change it (apply push, pop, sort and etc methods).
var testArray: ReadonlyArray<string>; - you declare that array can't change itself as whole entity

testArray = new Array<string>();

The assignment doesn't change the type of the testArray from ReadonlyArray<string> to Array<string>

[TobiasSekan]

Sorry guys, that was my fault, I don't know that sort return this
I was spoiled from C# .OrderBy extension function.
Have a nice day

@olegdunkan
you are right, that should be let