Move analysis options into a nested package

This allows other Sass team packages to re-use our analysis
configuration without having to copy it.

analysis/README.md

@@ -0,0 +1,14 @@
+This package provides a shared set of analysis options for use by Sass team
+packages. To use it, add it as a Git dependency to your `pubspec.yaml`:
+
+```yaml
+dev_dependencies:
+  sass_analysis:
+    git: {url: git://github.com/sass/dart-sass.git, path: analysis}
+```
+
+and include it in your `analysis_options.yaml`:
+
+```yaml
+include: package:sass_analysis/analysis_options.yaml
+```

analysis/lib/analysis_options.yaml

@@ -0,0 +1,17 @@
+analyzer:
+  strong-mode:
+    implicit-casts: false
+  language:
+    strict-inference: true
+    strict-raw-types: true
+  errors:
+    missing_js_lib_annotation: ignore
+    deprecated_member_use_from_same_package: ignore
+
+    # These are necessary for matching the JS API.
+    avoid_types_as_parameter_names: ignore
+
+    # This has tons of false positives for StreamSubscription.close().
+    unawaited_futures: ignore
+
+include: package:pedantic/analysis_options.yaml

analysis/pubspec.yaml

@@ -0,0 +1,13 @@
+name: sass_analysis
+version: 0.0.0
+description: Shared analysis options for Sass team packages.
+author: Sass Team
+homepage: https://github.com/sass/dart-sass/tree/master/analysis
+
+publish_to: none
+
+environment:
+  sdk: ">=2.0.0 <3.0.0"
+
+dependencies:
+  pedantic: ^1.0.0

analysis_options.yaml

@@ -1,17 +1 @@
-analyzer:
+include: package:sass_analysis/analysis_options.yaml
-  strong-mode:
-    implicit-casts: false
-  language:
-    strict-inference: true
-    strict-raw-types: true
-  errors:
-    missing_js_lib_annotation: ignore
-    deprecated_member_use_from_same_package: ignore
-
-    # These are necessary for matching the JS API.
-    avoid_types_as_parameter_names: ignore
-
-    # This has tons of false positives for StreamSubscription.close().
-    unawaited_futures: ignore
-
-include: package:pedantic/analysis_options.yaml

pubspec.yaml

@@ -39,6 +39,7 @@ dev_dependencies:
   js: "^0.6.0"
   node_preamble: "^1.1.0"
   pub_semver: "^1.0.0"
+  sass_analysis: {path: analysis}
   source_span: "^1.5.2"
   stream_channel: ">=1.0.0 <3.0.0"
   test_descriptor: "^1.1.0"