Fix type hints and add workflow for self.

Author: domdfcoding

.github/workflows/flake8.yml

@@ -0,0 +1,34 @@
+# This file is managed by 'repo_helper'. Don't edit it directly.
+---
+name: Flake8
+
+on:
+  push:
+  pull_request:
+    branches: ["master"]
+
+jobs:
+  Run:
+    name: "Flake8"
+    runs-on: "ubuntu-18.04"
+
+    steps:
+      - name: Checkout 🛎️
+        uses: "actions/checkout@v2"
+
+      - name: Setup Python 🐍
+        uses: "actions/setup-python@v2"
+        with:
+          python-version: "3.8"
+
+      - name: Install dependencies 🔧
+        run: |
+          python -VV
+          python -m site
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install .
+
+      - name: "Run Flake8"
+        run: "python -m flake8_github_action flake8_github_action"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

flake8_github_action/flake8_app.py

@@ -39,9 +39,9 @@
 
 # 3rd party
 import click
-import flake8.main.application
-from flake8.formatting.base import BaseFormatter
-from flake8_json_reporter.reporters import DefaultJSON
+import flake8.main.application  # type: ignore
+from flake8.formatting.base import BaseFormatter  # type: ignore
+from flake8_json_reporter.reporters import DefaultJSON  # type: ignore
 
 __all__ = ["Application", "JsonFormatter"]