Check out a free preview of the full Front-End Tooling and Workflows with Grunt and Beyond course:
The "Minifying JavaScript" Lesson is part of the full, Front-End Tooling and Workflows with Grunt and Beyond course featured in this preview video. Here's what you'd learn in this lesson:

Grunt has a nice API for adding metadata to distribution files. It supports reading JSON or YAML. This metadata could include dates, authors, copyrights, etc.

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