Use Case

As a node driver developer
I want error instance checks to be as specific as possible
So that I have a better understanding of what the code is trying to handle and confidence that it is doing the right thing

This is a first step to enabling us to work better with the codebase and understand how the errors are expected to flow through the code - where they come from and exactly what we expect to handle

Dependencies

• It would be best to have NODE-3363 completed so that the new types of MongoDriverError can be used where applicable

Unknowns

• There will be extensive investigation necessary to identify exactly what errors are being handled by those general instanceof MongoError checks

Acceptance Criteria

• Replace every instanceof MongoError check with a more specific error type check wherever possible
• Wherever not possible to use a more specific error, make a code comment explaining why that check has to remain general

Implementation Requirements

• The existing tests should all still pass

Testing Requirements

• Ensure there is a test for every check that is being modified; if there isn't one already for that code pathway, write one

Documentation Requirements

• None

Follow Up Requirements

• If there are cases that prove particularly difficult to replace with specific errors, create a new ticket for each of those