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-rw-r--r--danger/duplicate_yarn_dependencies/Dangerfile27
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diff --git a/danger/duplicate_yarn_dependencies/Dangerfile b/danger/duplicate_yarn_dependencies/Dangerfile
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+++ b/danger/duplicate_yarn_dependencies/Dangerfile
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+# frozen_string_literal: true
+
+return unless helper.all_changed_files.include? 'yarn.lock'
+
+duplicate = `node_modules/.bin/yarn-deduplicate --list --strategy fewer yarn.lock`
+ .split(/$/)
+ .map(&:strip)
+ .reject(&:empty?)
+
+return if duplicate.empty?
+
+warn 'This merge request has introduced duplicated yarn dependencies.'
+
+markdown(<<~MARKDOWN)
+ ## Duplicate yarn dependencies
+
+ The following dependencies should be de-duplicated:
+
+ * #{duplicate.map { |path| "`#{path}`" }.join("\n* ")}
+
+ Please run the following command and commit the changes to `yarn.lock`:
+
+ ```
+ node_modules/.bin/yarn-deduplicate --strategy fewer yarn.lock \\
+ && yarn install
+ ```
+MARKDOWN