Initial commit

Contents/Sketch/command.js

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+const sketch = require("sketch");
+
+function onDocumentChanged(context) {
+  var changes = context.actionContext;
+  for (i = 0; i < changes.length; i++) {
+    var change = changes[i];
+    var path = change.fullPath();
+    var type = change.type();
+
+    switch (type) {
+      case 1: // Property change
+        sketch.UI.message(`Property changed at ${path}`);
+        break;
+
+      case 2: // Deletion
+        // Objects that got moved in the tree are both deleted from the tree
+        // and re-added.
+        if (change.isMove()) break;
+
+        sketch.UI.message(`Object deleted at ${path}`);
+        break;
+
+      case 3: // Addition
+        if (change.isMove()) {
+          sketch.UI.message(
+            `Object moved from ${change
+              .associatedChange()
+              .fullPath()} to ${path}`
+          );
+        } else {
+          sketch.UI.message(`New object inserted at ${path}`);
+        }
+        break;
+
+      default:
+        sketch.UI.message(`⚠️ Unexpected change type ${type}`);
+    }
+  }
+}

Contents/Sketch/manifest.json

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+{
+  "compatibleVersion": 3,
+  "bundleVersion": 1,
+  "identifier": "com.sketch.plugins.document-change-example",
+  "commands": [
+    {
+      "script": "command.js",
+      "handlers": {
+        "onDocumentChanged": "onDocumentChanged"
+      }
+    }
+  ],
+  "version": "1.0.0",
+  "name": "Document Change",
+  "description": "Sample plugin showcasing how to handle document changes such as object addition, deletions and modifications.",
+  "author": "Sketch",
+  "disableCocoaScriptPreprocessor": true
+}