Output a helpful error message when no static.json is found (#202)

The error message is now output to `stderr` otherwise it's not shown. Closes GUS-W-8799430. Refs #198.
heroku · Mar 9, 2021 · 4c46624 · 4c46624
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+* [#202](https:/heroku/heroku-buildpack-static/pull/202) Output a helpful error message when no `static.json` is found
 
 ## v6 (2020-12-09)
 

diff --git a/bin/detect b/bin/detect
@@ -4,6 +4,7 @@
 build_dir=$1
 
 if [ ! -f "$build_dir/static.json" ]; then
+ echo "Could not find 'static.json'! Please ensure it exists and is checked into Git." >&2
  exit 1
 fi