feat: cancel run when no changes detected

Author: skulidropek

README.md

@@ -100,7 +100,8 @@ jobs:
 | `publish_npm` | Whether to publish to npm registry | No | `true` |
 | `publish_github_packages` | Whether to publish to GitHub Packages | No | `true` |
 | `skip_if_unchanged` | Skip version bump/publish if the local npm tarball matches the latest published tarball (ignoring version/gitHead) | No | `false` |
-| `neutral_on_no_changes` | Mark workflow as neutral (exit 78) when no changes are detected | No | `false` |
+| `neutral_on_no_changes` | Stop early without failing when no changes are detected | No | `false` |
+| `cancel_on_no_changes` | Cancel the workflow run when no changes are detected (requires `actions: write`) | No | `false` |
 | `npm_token` | NPM authentication token | No (required if `publish_npm` is true) | - |
 | `github_token` | GitHub token for releases and packages | Yes | - |
 

SETUP.md

@@ -96,7 +96,8 @@ permissions:
 ### Optional Behavior
 
 - `skip_if_unchanged` - When enabled, the action compares the local npm tarball with the latest published tarball (ignoring version/gitHead) and skips the release if identical. For private npm packages, provide `NPM_TOKEN` so the comparison can fetch the published tarball.
-- `neutral_on_no_changes` - When enabled, the action exits with code 78 (neutral/gray) if no changes are detected.
+- `neutral_on_no_changes` - When enabled, the action stops early without failing if no changes are detected.
+- `cancel_on_no_changes` - When enabled, the action cancels the workflow run (requires `actions: write` permission).
 
 ### Action Permissions Policy
 

action.yml

@@ -55,7 +55,11 @@ inputs:
     required: false
     default: "false"
   neutral_on_no_changes:
-    description: "Mark workflow as neutral (exit 78) when no changes are detected"
+    description: "Do not fail the workflow when no changes are detected"
+    required: false
+    default: "false"
+  cancel_on_no_changes:
+    description: "Cancel the workflow run when no changes are detected (requires actions: write)"
     required: false
     default: "false"
   npm_token:
@@ -180,13 +184,25 @@ runs:
           git stash drop >/dev/null 2>&1 || true
         fi
 
-    - name: Stop with neutral status on no changes
-      if: inputs.neutral_on_no_changes == 'true' && steps.compare_npm.outputs.should_release == 'false'
+    - name: Handle no changes conclusion
+      if: steps.compare_npm.outputs.should_release == 'false'
       shell: bash
       run: |
         set -euo pipefail
-        echo "::notice::No changes detected; marking workflow neutral."
-        exit 78
+
+        if [ "${{ inputs.cancel_on_no_changes }}" = "true" ]; then
+          echo "::notice::No changes detected; canceling workflow run."
+          curl -sS -X POST \
+            -H "Authorization: Bearer ${{ inputs.github_token }}" \
+            -H "Accept: application/vnd.github+json" \
+            "https://api.github.com/repos/${{ github.repository }}/actions/runs/${{ github.run_id }}/cancel" >/dev/null
+          exit 0
+        fi
+
+        if [ "${{ inputs.neutral_on_no_changes }}" = "true" ]; then
+          echo "::notice::No changes detected; stopping early."
+          exit 0
+        fi
 
     - name: Auto changeset (patch if no changeset exists)
       id: auto_changeset