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s-knibbs / dataclasses-jsonschema

JSON schema generation from dataclasses
MIT License
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Nullable is always Falsey #161

Closed snorfalorpagus closed 2 years ago

snorfalorpagus commented 3 years ago

This PR allows mypy to understand that the Nullable type is always false-y, so that mypy finds this valid:

@dataclass
class Example:
    name: Nullable[str | None] = None

example = Example("sienna")

assert example.name  # If this assert passes we know `name` is a string (because it isn't None or Nullable)

name_upper = example.name.upper()