Mypy third-party stubs

Since Mypy 0.900 third-party stubs are not shipped by default. Can (I’m not sure if it’s viable) the pre-commit hook be updated to run mypy --install-types to install all missing stub package prior to running the mypy command?

[asottile]

to be clear, args: [--install-types] may possibly work but is not supported because it mutates the pre-commit environment at runtime – pre-commit environments are intended to be immutable. it will also, for instance, not work in https://pre-commit.ci where network is forbidden at runtime.

also note that this is not a new problem, the isolated mypy virtualenv has always been missing some amount of stubs – just now it is missing more of them.

auto-enabling --install-types will not happen here but you’re free to proceed in unsupported territory if you want.

[flniu]

I tried this in .pre-commit-config.yaml and it worked:

- repo: https://github.com/pre-commit/mirrors-mypy
  rev: v0.910
  hooks:
  - id: mypy
    args:
      - --install-types
      - --non-interactive