Cant iterate over Array.prototype.entries inside for of loop

[n-filatov]

I have a problem to iterate inside for of loop over array.entries(). Compiled version of code trys to get length property of array.entries but this property is undefined, coz array.entries returns Iterator which has not length property.
Code

const a: any = [1, 2, 3];

for (const x of a.entries()) {
    console.log(x)
}

Expected behavior:
Code will iterate over a.entries and call console.log()

How it works in babel: Babel Playground

Actual behavior:
Nothing happens, coz no iteration.

Playground Link: Playground

[nmain]

This is working as intended. If you want full iterable semantics in downlevel emit, turn on the downlevel iteration compiler flag: https://www.typescriptlang.org/docs/handbook/compiler-options.html

[n-filatov]

It is ok that my code wont works properly by default and i should use flags for it. I thought that when i set target as ES5 it will compile working code by default.

[nmain]

I believe this has been discussed before, but I couldn't find much in search. In ##34572 @DanielRosenwasser states "We have opinionated defaults for downlevel iteration." as a side comment but doesn't elaborate further.

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.