Running "uglify:applib" (uglify) task
[TypeError: Cannot assign to read only property 'warnings' of true]
I ran into this error while copying an old grunt build that I had made. It seemed that the error came from uglify. I looked through the code but found nothing. I started changing random values. Then I found the cause:
uglify: {
options: {
compress: true
}
}
The error is that compress does not take true as a value. It should be set to {}
instead:
uglify: {
options: {
compress: {}
}
}
Please let me know if this helped you, down in the comments below :)