🚨 move tc type into type_checking guard

.editorconfig

@@ -0,0 +1,32 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# The JSON files contain newlines inconsistently
+[*.json]
+insert_final_newline = ignore
+
+# Makefiles always use tabs for indentation
+[Makefile]
+indent_style = tab
+
+# Batch files use tabs for indentation
+[*.bat]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
+
+# Matches the exact files either package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_size = 2
+
+[{*.py,*.pyi}]
+indent_size = 4