Issue #2494177 by nod_: Enable ESLint warning for missing JSDoc

.eslintrc

@@ -23,6 +23,7 @@
     "guard-for-in": 2,
     "indent": [2, 2, {"indentSwitchCase": true}],
     "key-spacing": [2, {"beforeColon": false, "afterColon": true}],
+    "lines-around-comment": [2, {"beforeBlockComment": true, "afterBlockComment": false}],
     "no-implied-eval": 2,
     "no-mixed-spaces-and-tabs": 2,
     "no-nested-ternary": 2,
@@ -42,6 +43,13 @@
     "strict": 2,
     // Warnings.
     "max-nested-callbacks": [1, 3],
+    "valid-jsdoc": [1, {
+      "prefer": {
+        "returns": "return",
+        "property": "prop"
+      },
+      "requireReturn": false
+    }],
     // Disabled.
     "camelcase": 0,
     "consistent-return": 0,