JSZip.utils.transformTo uses too much memory in Chrome

[petrcermak]

Given a Uint8Array containing 70,000,000 char codes (~67 MiB), JSZip.utils.transformTo('string', array) runs out of memory on Chrome (needs more than 1,413 MiB RAM).

This can easily be fixed by using TextDecoder instead of String.fromCharCode (if available). See catapult-project/catapult#2051 and https://codereview.chromium.org/1739663003/ for more details.

[dduponchel]

TextEncoder and TextDecoder were removed in #159, I'll re-add them.

[dduponchel]

JSZip.utils.transformTo('string', *) is not the same as TextDecoder: the first transforms an object into a binary string while the second will use the UTF8 encoding. I think you want the UTF8 version (which should use a TextDecoder if available), not the binary string one.

Also, JSZip.utils is deprecated since JSZip v2.3.0 (see #123) and JSZip.compressions will be removed is JSZip v3 (see #224).

[petrcermak]

OK. Thank you for looking into this!

[dduponchel]

If you use only JSZip.utils and JSZip.compressions['DEFLATE'].uncompress, you may want to use pako directly (which it behind the uncompress method).

[petrcermak]

Acknowledged. Thanks!