Breakpoint debugging minfied/mangled/compiled variables

Using Watch Expressions on the right hand side, usually solves this.Expand the menu, and use the plus button to add your variables.You can use someNumber and someOtherNumber, and even someNumber + someOtherNumber.

Looks like it's been addressed and will become available in the next Chromium update

There's still no solution to mapping variable names in Javascript source maps, but there's a solution for Babel 6. As we've adopted ES2015, the mangled import names became a major pain point during development. So I created an alternative to the CommonJS module transform that does not change the import names called babel-plugin-transform-es2015-modules-commonjs-simple.

As long as you aren't writing modules that depend on exporting dynamic bindings it is a drop-in replacement for the default babel commonjs module transform:

npm install --save-dev babel-plugin-transform-es2015-modules-commonjs-simple

and .babelrc:

"plugins": ["transform-es2015-modules-commonjs-simple"]

This will compile ES2015 modules to CommonJS without changing any of the symbol names of imported modules. Caveats are described in the readme.

This won't help you with minifying/uglifying, though, so the best solution seems to be to just don't use minification during development. Then at least it's only a problem if you have to debug something on a production web site.