When using multiple JavaScript libraries, it is inevitable that one JavaScript file will need to call functions named in other libraries. This is necessary but can cause issues if all of the libraries aren't present.

Error handling with JavaScript is somewhat lackluster. With this in mind, you should do your best to catch and handle errors and avoid sending them to the end-user. In order to prevent errors and allow for scalability, you should test for functions that aren't present in the script where you are calling them.

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