For instance:
let myList = [];
for (let item of myList) {
...
}
After being transpiled:
var myList = [];
for (var _i = 0, myList_1 = myList; _i < myList_1.length; _i++) {
var item = myList_1[_i];
}
Why is myList_1 necessary in this case?
You can test this out for yourself on the Typescript playground here.
By potentially reassigning aKeys within the loop body, the iteration should remain unaffected. While it may not always be necessary when you do not make any changes, the transpiler cannot definitively determine this.
Additionally, as noted by @Thomas in the comments, evaluating the expression only once is crucial. Although it may seem obvious that there would be no impact when referencing a const variable, this is not always the case in a more general scenario.
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