It is a link of babel-sublime plugin.
The plugin suggested an Advanced usage：
It’s possible to set Babel as the only JavaScript package by disabling the stock one. To do so, add “ignored_packages”: [“JavaScript”] to your Preferences.sublime-settings. The benefits include:
But after I added JavaScirpt to settings in the ignored_packages. I got an error report:
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It appeared after my ST3 updated from 3083 to 3126.