#4326 - TypeError: Cannot read property 'param' of undefined (#4895)

* creating rule

* rule written

* rule replicated

* isolated rule

* added test files back in

* captured case of this.contentTags being undefined

* added documentation to test

src/rules/completed-docs/tagExclusion.ts

@@ -49,6 +49,10 @@ export class TagExclusion extends Exclusion<ITagExclusionDescriptor> {
                 return true;
             }
 
+            if (this.contentTags === undefined) {
+                return false;
+            }
+
             const matcherBody = this.contentTags[tagWithContent[0]];
             if (matcherBody === undefined) {
                 continue;

test/rules/completed-docs/defaults/edge-case/test.ts.lint

@@ -0,0 +1,5 @@
+/**
+ * Snippet where no error occurs (But completed-docs correctly gives an error on the lack of jsdoc).
+ * @returns {Promise<Object>}
+ */
+export const handler = async () => { ... }

test/rules/completed-docs/defaults/edge-case/tslint.json

@@ -0,0 +1,13 @@
+{
+    "rules": {
+      "completed-docs": [
+        true,
+        { 
+          "variables": { 
+            "visibilities": ["exported"], 
+            "tags": { "existence": [""] } 
+          } 
+        }
+      ]
+    }
+  }