Legally, the minified form is considered the "executable" form, not source code form, with respect to javascript (at least with respect to the MPL-2.0 which enumerates this in the license or possible the FAQ about the license. I'm not certain about the GPL).
This means that technically, with a copyleft license that isn't the MPL-2.0, you need to make available the option to get your javascript, not just the copyleft libraries you build upon, in unminified source code form.
At the end of the day, the MPL is a great license because it balances business needs with the needs of the common. The only reason for businesses to dislike it is because it comes with a slightly higher cost in the form of the burden to provide the original source to the MPL parts or let the end user know how to acquire a copy. This is a pretty minimal engineering cost that shouldn't be much more than an hours worth of labor unless you modify the MPL-ed source and need to make your modified version available. Even then, it shouldn't be more than a day or two of labor if you know what you're doing. You just need to make sure that your build system uploads the MPLed version somewhere or your MPLed modified source is available somewhere like github and your minified code gives people a link to the place where the unminified MPL code lives.
Comments
Legally, the minified form is considered the "executable" form, not source code form, with respect to javascript (at least with respect to the MPL-2.0 which enumerates this in the license or possible the FAQ about the license. I'm not certain about the GPL).
This means that technically, with a copyleft license that isn't the MPL-2.0, you need to make available the option to get your javascript, not just the copyleft libraries you build upon, in unminified source code form.
At the end of the day, the MPL is a great license because it balances business needs with the needs of the common. The only reason for businesses to dislike it is because it comes with a slightly higher cost in the form of the burden to provide the original source to the MPL parts or let the end user know how to acquire a copy. This is a pretty minimal engineering cost that shouldn't be much more than an hours worth of labor unless you modify the MPL-ed source and need to make your modified version available. Even then, it shouldn't be more than a day or two of labor if you know what you're doing. You just need to make sure that your build system uploads the MPLed version somewhere or your MPLed modified source is available somewhere like github and your minified code gives people a link to the place where the unminified MPL code lives.