Merge branch 'winh-eslint-cache' into 'master'

Enable caching for ESLint

See merge request gitlab-org/gitlab!22114

.gitignore

@@ -7,6 +7,7 @@
 .bundle
 .chef
 .directory
+.eslintcache
 /.envrc
 eslint-report.html
 /.gitlab_shell_secret

package.json

@@ -4,8 +4,8 @@
     "check-dependencies": "scripts/frontend/check_dependencies.sh",
     "clean": "rm -rf public/assets tmp/cache/*-loader",
     "dev-server": "NODE_OPTIONS=\"--max-old-space-size=3584\" nodemon -w 'config/webpack.config.js' --exec 'webpack-dev-server --config config/webpack.config.js'",
-    "eslint": "eslint --max-warnings 0 --report-unused-disable-directives --ext .js,.vue .",
-    "eslint-fix": "eslint --max-warnings 0 --report-unused-disable-directives --ext .js,.vue --fix .",
+    "eslint": "eslint --cache --max-warnings 0 --report-unused-disable-directives --ext .js,.vue .",
+    "eslint-fix": "eslint --cache --max-warnings 0 --report-unused-disable-directives --ext .js,.vue --fix .",
     "eslint-report": "eslint --max-warnings 0 --ext .js,.vue --format html --output-file ./eslint-report.html --no-inline-config .",
     "file-coverage": "scripts/frontend/file_test_coverage.js",
     "prejest": "yarn check-dependencies",