From 5ba08f0b8c3e1d8402635e0482813a701638c40e Mon Sep 17 00:00:00 2001
From: Jay <41024828+JBhagat841@users.noreply.github.com>
Date: Sun, 8 Dec 2019 16:01:55 -0500
Subject: [PATCH] #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            |  4 ++++
 .../completed-docs/defaults/edge-case/test.ts.lint  |  5 +++++
 .../completed-docs/defaults/edge-case/tslint.json   | 13 +++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 test/rules/completed-docs/defaults/edge-case/test.ts.lint
 create mode 100644 test/rules/completed-docs/defaults/edge-case/tslint.json

diff --git a/src/rules/completed-docs/tagExclusion.ts b/src/rules/completed-docs/tagExclusion.ts
index f1a6affb0d7..4977d010d74 100644
--- a/src/rules/completed-docs/tagExclusion.ts
+++ b/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;
diff --git a/test/rules/completed-docs/defaults/edge-case/test.ts.lint b/test/rules/completed-docs/defaults/edge-case/test.ts.lint
new file mode 100644
index 00000000000..16d3985926b
--- /dev/null
+++ b/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 () => { ... }
diff --git a/test/rules/completed-docs/defaults/edge-case/tslint.json b/test/rules/completed-docs/defaults/edge-case/tslint.json
new file mode 100644
index 00000000000..ca96ba6b633
--- /dev/null
+++ b/test/rules/completed-docs/defaults/edge-case/tslint.json
@@ -0,0 +1,13 @@
+{
+    "rules": {
+      "completed-docs": [
+        true,
+        { 
+          "variables": { 
+            "visibilities": ["exported"], 
+            "tags": { "existence": [""] } 
+          } 
+        }
+      ]
+    }
+  }
\ No newline at end of file