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diff --git a/danger/prettier/Dangerfile b/danger/prettier/Dangerfile
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+# frozen_string_literal: true
+
+def get_prettier_files(files)
+ files.select do |file|
+ file.end_with?('.js', '.scss', '.vue')
+ end
+end
+
+prettier_candidates = get_prettier_files(git.added_files + git.modified_files)
+
+return if prettier_candidates.empty?
+
+unpretty = `node_modules/prettier/bin-prettier.js --list-different #{prettier_candidates.join(" ")}`
+ .split(/$/)
+ .map(&:strip)
+ .reject(&:empty?)
+
+return if unpretty.empty?
+
+warn 'This merge request changed frontend files without pretty printing them.'
+
+markdown(<<~MARKDOWN)
+ ## Pretty print Frontend files
+
+ The following files should have been pretty printed with `prettier`:
+
+ * #{unpretty.map { |path| "`#{path}`" }.join("\n* ")}
+
+ Please run
+
+ ```
+ node_modules/.bin/prettier --write \\
+ #{unpretty.map { |path| " '#{path}'" }.join(" \\\n")}
+ ```
+
+ Also consider auto-formatting [on-save].
+
+ [on-save]: https://docs.gitlab.com/ee/development/new_fe_guide/style/prettier.html
+MARKDOWN