1 files changed, 41 insertions, 0 deletions
diff --git a/danger/Dangerfile-bundle_size b/danger/Dangerfile-bundle_size
new file mode 100644
index 00000000000..23ab726096e
--- /dev/null
+++ b/danger/Dangerfile-bundle_size
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+# This file isn't named "Dangerfile" so that it's not imported by default since it's only meant to be run in the `bundle-size-review` job.
+
+analysis_result = "./bundle-size-review/analysis.json"
+markdown_result = "./bundle-size-review/comparison.md"
+
+# Executing the webpack-entry-point-analyser
+# We would like to do that in the CI file directly,
+# but unfortunately the head_commit SHA is not available
+# as a CI variable due to our merge into master simulation
+analyze_cmd = [
+  "webpack-entry-point-analyser",
+  "--from-file ./webpack-report/stats.json",
+  "--json #{analysis_result}",
+  " --sha #{gitlab&.head_commit}"
+].join(" ")
+
+# execute analysis
+`#{analyze_cmd}`
+
+# We are executing the comparison by comparing the start_sha
+# to the current pipeline result. The start_sha is the commit
+# from master that was merged into for the merged pipeline.
+comparison_cmd = [
+  "webpack-compare-reports",
+  "--job #{ENV["CI_JOB_ID"]}",
+  "--to-file #{analysis_result}",
+  "--html ./bundle-size-review/comparison.html",
+  "--markdown #{markdown_result}"
+].join(" ")
+
+# execute comparison
+`#{comparison_cmd}`
+
+comment = `cat #{markdown_result}`
+
+unless comment.strip.empty?
+  markdown(<<~MARKDOWN)
+    #{comment}
+  MARKDOWN
+end