Add support for eslint

ahoy.test.yml

@@ -84,3 +84,12 @@ commands:
       shift
       /usr/local/bin/node_cmd yarn --silent --cwd web/core stylelint --formatter verbose --config ./.stylelintrc.json "../modules/contrib/${module}/**/*.css" --color
     usage: Stylelint tests by module
+  eslintmodule:
+    cmd: |
+      module=$1
+      shift
+      cd web/modules/contrib/$module
+      test -e .prettierrc.json || ln -s /drupal/web/core/.prettierrc.json .
+      test -e .prettierignore || echo '*.yml' > .prettierignore
+      /drupal/web/core/node_modules/.bin/eslint --no-error-on-unmatched-pattern --ignore-pattern="*.es6.js" --resolve-plugins-relative-to=/drupal/web/core --ext=.js,.yml .
+    usage: Eslint tests by module