feat(purge): handle missing doc, return something

packages/node_modules/pouchdb-core/src/adapter.js

@@ -966,33 +966,41 @@ AbstractPouchDB.prototype.purge = adapterFun('_purge', function (docId, rev) {
   }
   var self = this;
 
-  // TODO: this should probably return some information
-  // about the completed purge
   return new Promise((resolve) => {
     self._getRevisionTree(docId, async (whatever, revs) => {
+      if (!revs) {
+        throw new Error('The target document doesn’t exist (has no revisions)');
+      }
+      // `findPathToLeaf` throws if rev is invalid
       const path = findPathToLeaf(revs, rev);
       console.log("purge path", path);
-
-        await (async () =>
-          new Promise((resolve) =>
-            self._purge(docId, path, (err) => {
-              if (err) {
-                console.error("error", err);
-              } else {
-                console.log("purge successful");
-              }
-              resolve();
-            })
-          ))();
-
+      await (async () =>
+        new Promise((resolve) =>
+          // TODO: The purge itself returns nothing, is that ok?
+          // CouchDB returns the successfully purged revisions
+          self._purge(docId, path, (err) => {
+            if (err) {
+              console.error("error", err);
+            } else {
+              console.log("purge successful");
+            }
+            resolve();
+          })
+        ))();
+      let result;
       try {
+        // If the doc had conflicts and still exists, return it
+        result = await self.get(docId);
         console.log(
           "revs_info after purge",
           await self.get(docId, { revs_info: true })
         );
-      } catch (err) {}
-
-      resolve();
+      } catch (err) {
+        // If the doc was conflict-free, it is now gone. Return the `not_found` error,
+        // as this is the expected happy path result of a `get()` on a purged doc
+        result = err;
+      }
+      resolve(result);
     });
   });
 });