Lot of npm-debugs files can be generated in devs computers, each one with a number suffix ex: ```sh npm-debug.log.213131231 npm-debug.log.213131231 npm-debug.log.213131231 ``` Adding a wildcard prevents for accidental commits _Official and default .gitignore for node in github.com: https://github.com/github/gitignore/blob/master/Node.gitignore#L4_bubble