The One-Global Approach

You may be thinking at this point, “How is it possible to write JavaScript without introducing any globals?” Although it is technically possible through some clever patterns, this approach is usually not feasible or maintainable in the long run. When JavaScript is developed by a team, that typically means that multiple files are loaded in various scenarios, and the only way to enable communication between this disparate code is to have something that all of the code can rely on to be present. The best approach is to try to have as small a global footprint as possible by agreeing to create only one global object.

The one-global approach is used by all popular JavaScript libraries: