Added eslint checks for css module usage

.eslintrc.yml

@@ -1,6 +1,7 @@
 extends:
   - ./eslint/basics.yml
   - ./eslint/compat.yml
+  - ./eslint/cssmodules.yml
   - ./eslint/filenames.yml
   - ./eslint/flowtype.yml
   - ./eslint/import.yml

eslint/cssmodules.yml

@@ -0,0 +1,5 @@
+plugins:
+  - css-modules
+
+extends:
+  - plugin:css-modules/recommended

package.json

@@ -44,6 +44,7 @@
     "eslint-import-resolver-babel-module": "^3.0.0",
     "eslint-plugin-babel": "^4.1.1",
     "eslint-plugin-compat": "^1.0.2",
+    "eslint-plugin-css-modules": "^2.7.1",
     "eslint-plugin-filenames": "^1.2.0",
     "eslint-plugin-flowtype": "^2.32.1",
     "eslint-plugin-flowtype-errors": "^3.0.3",

yarn.lock

@@ -1411,8 +1411,8 @@ editorconfig@^0.13.2:
     sigmund "^1.0.1"
 
 electron-to-chromium@^1.2.3, electron-to-chromium@^1.2.7:
-  version "1.3.4"
-  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.4.tgz#e51769c0cf550e0cf5aedf6aa2b803a264b3a900"
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.5.tgz#6cd6ff2106224a6130e235f21050f9546bc3e729"
 
 elegant-spinner@^1.0.1:
   version "1.0.1"
@@ -1576,6 +1576,13 @@ eslint-plugin-compat@^1.0.2:
     caniuse-db "1.0.30000626"
     requireindex "^1.1.0"
 
+eslint-plugin-css-modules@^2.7.1:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-css-modules/-/eslint-plugin-css-modules-2.7.1.tgz#d8dc77b59aa3762ff7992ec57372468a7e8c6722"
+  dependencies:
+    gonzales-pe "^4.0.3"
+    lodash "^4.17.2"
+
 eslint-plugin-filenames@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-filenames/-/eslint-plugin-filenames-1.2.0.tgz#aee9c1c90189c95d2e49902c160eceefecd99f53"