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If you assign a value to a variable that is not explicitly declared (with var, let, const or as an argument of the current function), JavaScript will implicitly create it as a global variable. In a web application, “global” means that it is property of the window object.

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medium.com

Beware of unsafe implicit globals in JavaScript

The hidden danger of undeclared variables and how to get rid of them. If you assign a value to a variable that is not explicitly declared (with var, let, const or as an argument of the current function), JavaScript will implicitly create it as a global variable. In a web application, “global” means that it is property of the window object.

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