What will happen if you try to reassign an exported constant variable in a module?

When a variable is exported as a constant using the const keyword in a module, it is immutable, meaning its reference cannot be changed after it has been initialized. If an attempt is made to reassign a value to this constant variable, a TypeError will be thrown, specifically indicating that reassignment is not allowed. This behavior is consistent with JavaScript's handling of const declarations, which enforce the rule that once a constant variable is assigned, its value cannot be altered. Thus, trying to reassign it leads to an error, ensuring that the integrity of the constant value is maintained within the module.

This understanding aligns with the principles of block scoping in JavaScript, where const maintains a constant reference to the value, differentiating it from variables defined with let or var, which can be reassigned.