jsesc breaks uglifyjs?

[athomasoriginal]

Is this a bug report?

No.

Summary

I am experimenting with jsesc and I noticed that when used inside of react-create-app the yarn build command will fail saying there is an invalid assignment. You can see this behaviour in this demo repo:

https://github.com/tkjone/jsesc-test

You can see where I am using it in this file:

https://github.com/tkjone/jsesc-test/blob/master/src/App.js

To Reproduce

Move into the react-create-app demo provided above and run yarn build.

Output

➜ yarn build

yarn build v0.27.5
$ react-scripts build
Creating an optimized production build...
Failed to compile.

static/js/main.f43f915d.js from UglifyJs
Invalid assignment [./~/jsesc/jsesc.js:5,0][static/js/main.f43f915d.js:13460,32]

error Command failed with exit code 1.

[Timer]

Please post the output.

[athomasoriginal]

@Timer, I have updated the original post with the output.

[Timer]

Please see npm run build fails to minify in our Troubleshooting seciton. 😄

Unfortunately, jsesc does not ship a browser-compatible version.

[athomasoriginal]

Yes, that would explain it. Thanks, @Timer

[mathiasbynens]

Unfortunately, jsesc does not ship a browser-compatible version.

It does: https://github.com/mathiasbynens/jsesc#support

[Timer]

@tkjone looks like you need to downgrade to version 1.x for browser support, per @mathiasbynens's comment.