The discussion was about whether or not to use console.log (where you need to be working with source code anyway) so debugger is a useful alternative in this case. For a production build, it would be common practice to minify and uglify the code - stripping out all console logging and 'debugger' statements. So, in that regard, yes, you are correct - this would not apply to a production build scenario.
Obviously, your tools and approaches will vary according to the situation. It's helpful to be aware of all approaches and use as you see fit.
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The discussion was about whether or not to use console.log (where you need to be working with source code anyway) so debugger is a useful alternative in this case. For a production build, it would be common practice to minify and uglify the code - stripping out all console logging and 'debugger' statements. So, in that regard, yes, you are correct - this would not apply to a production build scenario.
Obviously, your tools and approaches will vary according to the situation. It's helpful to be aware of all approaches and use as you see fit.