fix: avoid erring out with missing function and any context

Author: brettz9

src/jsdocUtils.js

@@ -275,7 +275,11 @@ const getFunctionParameterNames = (
     throw new Error(`Unsupported function signature format: \`${param.type}\`.`);
   };
 
-  return (functionNode.params || functionNode.value.params).map((param) => {
+  if (!functionNode) {
+    return [];
+  }
+
+  return (functionNode.params || functionNode.value?.params || []).map((param) => {
     return getParamName(param);
   });
 };

test/rules/assertions/requireParam.js

@@ -3390,5 +3390,37 @@ export default {
       ],
       parser: require.resolve('@typescript-eslint/parser'),
     },
+    {
+      code: `
+      /**
+       * Test
+       */
+      `,
+      ignoreReadme: true,
+      options: [
+        {
+          contexts: [
+            'any',
+          ],
+        },
+      ],
+    },
+    {
+      code: `
+      /**
+       * Helper function to warp to a custom stage/level.
+       */
+       export function setCustomStage(): void {}
+       `,
+      ignoreReadme: true,
+      options: [
+        {
+          contexts: [
+            'any',
+          ],
+        },
+      ],
+      parser: require.resolve('@typescript-eslint/parser'),
+    },
   ],
 };