Obfuscate error.

WEB TMS WEB Core
1

Hi, I'm been working on a project for some time now with no errors til now.

It compiles ok under debug, but when I select Release in the Obfuscate part I get errors.

Any hints?

Thanks in advance,

Omar Zelaya

Obfuscate errors:

Parse error at D:\ISAT\WebAdmin\TMSWeb\Release\ISWebAdmin.js:24140,33
const userAgentData = window?.navigator?.userAgentData?.brands;
^
ERROR: Unexpected token: punc (.)
at pos (C:\snapshot\Terser\node_modules\terser\lib\parse.js:373:35)
at c (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1069:18)
at type (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1079:28)
at token (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1082:27)
at val (C:\snapshot\Terser\node_modules\terser\lib\parse.js:2273:25)
at ge (C:\snapshot\Terser\node_modules\terser\lib\parse.js:2978:17)
at AST_Conditional (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3037:13)
at left (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3037:24)
at AST_Sequence (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3113:41)
at qe (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3137:51)

[Fatal Error] Parse error at D:\ISAT\WebAdmin\TMSWeb\Release\ISWebAdmin.js:24140,33
const userAgentData = window?.navigator?.userAgentData?.brands;
^
ERROR: Unexpected token: punc (.)
at pos (C:\snapshot\Terser\node_modules\terser\lib\parse.js:373:35)
at c (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1069:18)
at type (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1079:28)
at token (C:\snapshot\Terser\node_modules\terser\lib\parse.js:1082:27)
at val (C:\snapshot\Terser\node_modules\terser\lib\parse.js:2273:25)
at ge (C:\snapshot\Terser\node_modules\terser\lib\parse.js:2978:17)
at AST_Conditional (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3037:13)
at left (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3037:24)
at AST_Sequence (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3113:41)
at qe (C:\snapshot\Terser\node_modules\terser\lib\parse.js:3137:51)

2

Is this line of code

const userAgentData = window?.navigator?.userAgentData?.brands;

a line of code you wrote yourself and if so, why these questionmarks?

3

@brunofierens

?. is called an "Optional Chaining Operator" in JavaScript.

It's super handy. I use it all the time, but I haven't tried it in TMS WEB Core yet.

Here's some info on it: Optional chaining (?.) - JavaScript | MDN

4

@Zelaya_Omar

You could write that line as:

const userAgentData = window.navigator && window.navigator.userAgentData && window.navigator.userAgentData.brands;

instead of:

const userAgentData = window?.navigator?.userAgentData?.brands;

Using the logical AND (&&) operator to check each property was the old way of doing it before ?. was introduced.

@brunofierens

But ideally, the optional chaining operator (?.) should be fixed and work in TMS WEB Core (or PAS2JS) in my opinion. It's a very useful operator!

5

Possibly, the terser obfuscator tool we use (GitHub - terser/terser: 🗜 JavaScript parser, mangler and compressor toolkit for ES6+) does not support this yet. We'll need to investigate.

6

@brunofierens Seems like there are a couple of issues regarding optional chaining for the terser obfuscator tool: Issues · terser/terser · GitHub

Most of them are marked as Completed and Closed though.

7

We'll look if we might have to update the terser tool in the TMS WEB Core distribution.

8

Thanks for the hint. It worked.

Omar Zelaya