Add lints for Flutter apps and packages

Author: goderbauer

lib/flutter.yaml

@@ -0,0 +1,19 @@
+# Lints recommended for Flutter apps and packages.
+#
+# This file is meant to be used in combination with the lints defined in
+# core.yaml and recommend.yaml. Consider importing all three files in your
+# project's analysis_options.yaml file.
+linter:
+  rules:
+    - avoid_print
+    - avoid_unnecessary_containers
+    - avoid_web_libraries_in_flutter
+    - no_logic_in_create_state
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_if_elements_to_conditional_expressions
+    - sized_box_for_whitespace
+    - use_full_hex_values_for_flutter_colors
+    - use_key_in_widget_constructors