Error when obfuscating TypeScript with deadCodeInjection: true

[msheakoski]

Using webpack-obfuscator 0.10.1 (also with 0.10.0), I receive the following error when running webpack -p. It only occurs when deadCodeInjection is turned on and happens at any deadCodeInjectionThreshold. I'm not sure if it's my specific setup or an issue with javascript/webpack-obfuscator.

./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:52
                .keys(node)
                     ^
TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:52:22)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:64:53
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:64:53
    at Array.forEach (native)
    at e (./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:54:25)
    at Array.map (native)
    at ./node_modules/javascript-obfuscator/dist/webpack:/src/node/NodeUtils.ts:62:48

[sanex3339]

Interesting , can you attach your source code or simple project that can reproduce this error?

[msheakoski]

@sanex3339 I narrowed down the error to what I believe is related to TypeScript's generated code for async/await inside of a try/catch when targeting ES5 as the compilation language. Please see the attached .zip file for the example project that I made.

javascript-obfuscator-example.zip

[sanex3339]

Oh, catch it!

This construction thows error:

_a.trys.push([0, 2, , 3]);

In ast tree empty array element parsed as null and i didn't expect this behaviour.
I'll release 0.10.2 in a hour or so.

[sanex3339]

Fixed! Please check new javascript-obfuscator@0.10.2 and webpack-obfuscator@0.10.2.

[msheakoski]

@sanex3339 I tested it out and the error no longer occurs during webpack compilation. The generated JavaScript appears to run without any visible issues in Chrome. Thank you! 👏👏👏

[sanex3339]

You're welcome.