Expected longitude to be typeof number, actual typeof was undefined

This error occurs when you try to use a variable that has not been defined or has been defined with an undefined value. In this case, you are trying to use a variable called "longitude" as if it were a number, but it has not been defined or has been defined with an undefined value.

To fix this error, you need to make sure that the variable "longitude" is defined and has a numeric value before using it. You can do this by initializing the variable with a default value or by assigning it a value before using it in your code.

For example, you can initialize the variable with a default value of 0:

let longitude = 0;

Or you can assign it a value based on some input or calculation:

let longitude = calculateLongitude(someInput);

By ensuring that the variable is defined and has a valid value, you can prevent this error from occurring in your code.