Very useful short routines to use for large projects
AutoGeneratedPackage is an option for notebooks that specifies whether a package is automatically created when a notebook that contains initialization cells or groups is saved.
SetOptions[InputNotebook[], AutoGeneratedPackage -> Automatic]
Example of how to load a .m library from within Mathematica: Import["https://raw.githubusercontent.com/tchronis/Mathematica/master/json-association/json-association.m"]