Uglifyjs: Option to prevent names from being mangled when calling UglifyJS.minify()

[gabmontes]

When using UglifyJS.minify(), the property mangle can only be true or false so there is no way to enable mangling but set a list of reserved names as it can be done by ussing the --reserved parameter.

Is there any way of still using UglifyJS.minify(), enable mangling and specify those reserved names? If not, can you please consider adding that option?

[rvanvelzen]

The mangle property can actually be an object. If you add the except property there, you can exclude variable names from mangling:

UglifyJS.minify('precious_file.js', {
  compress: true,
  mangle: {
    except: ['foozah']
  }
});

Please let me know if that doesn't solve your issue.

[gabmontes]

@rvanvelzen Thanks for the quick response! That solved my problem.

Looking at the code I saw mangle could be an object but saw no code or documentation that described the content of that object. It would be great if a note can be added to the section The Simple Way or to document the object and its properties that can be passed as parameter in the call to mangle_names at Mangling.

[rvanvelzen]

Thanks, you are right - it only mentions that you can pass false to disable mangling. Lets keep this open until it is properly documented.

[pmkhoa]

Finally I found this.
I took me several hours to find a way to reserve keywords from being mangled by specifying inside except, instead of reserved. To make it consistent with the command line that use --reserved, I suggest to use reserve.

[alexlamsl]

https://github.com/mishoo/UglifyJS2#mangle