BSK-E0020 error

Missing @overload implementation

When a function name is defined multiple times and every definition carries the @overload decorator, there is no concrete implementation body. Python's typing.overload protocol requires exactly one implementation function without @overload.

This rule fires once per overload group that lacks a plain implementation.

Real basilisk check output

What you see when BSK-E0020 fires on a minimal example:

basilisk check output reporting BSK-E0020 — Missing `@overload` implementation

How to handle it

Every rule is on by default — strict is the default, not a cage. You can dial BSK-E0020 down per-file or per-path from your editor or pyproject.toml, or fix the code so it type-checks. See the Type Safety rules and the complete diagnostic reference.

Canonical URL: https://www.basilisk-python.dev/errors/BSK-E0020