Launch darkly version 3+ crashes older browsers

[gregdolby]

Describe the bug
Launch darkly version 3+ crashes chrome browser's version 79 or lower. I noticed this when trying to run a web app on Samsung Tizen TV because they use older browsers. Then I was able to reproduce in an older version of Chrome using BrowserStack

To reproduce
Load an app on chrome browser 79 or lower (I used browserstack)

Expected behavior
I expect it to load properly on older browsers

Logs

SDK version
3.1.0

Language version, developer tools
Node v16.8.0
npm 7.21.0

OS/platform
chrome 79
macOS Monterey 12.6.3

[yusinto]

The React SDK v3.0 and up uses optional chaining which is supported by modern browsers. It looks like you bundle your react app using webpack. The issue is webpack 4 uses a version of acorn which does not transpile the optional chaining operator. The solution as you can see in the react async provider example is to resolve the acorn package version that does support it. To do this, in your package.json file:

  "resolutions": {
    "acorn": "npm:acorn-with-stage3"
  }

Webpack 5 supports optional chaining out of the box so we recommend you upgrade to that if possible. If you use other bundlers, make sure to enable/include plugins for optional chaining for your bundler.

[yauheniivashkevich]

I have the same issue when run jest test
adding resolutions don't help to fix that

[yusinto]

This should be fixed in 3.0.2. We have removed the optional chaining operator so please update to that version if you have issues with the ? operator.