Merge pull request #1872: ESLint: use type-safe equality operators

Author: victorlin

.eslintrc.yaml

@@ -21,6 +21,7 @@ globals:
 
 rules:
   # Code quality rules
+  eqeqeq: error
   "@typescript-eslint/no-empty-function": ["error", { "allow": ["arrowFunctions"] }]
   "@typescript-eslint/no-explicit-any": off # Allow explicit any to make incremental TypeScript adoption easier.
   no-unused-vars: off

src/util/parseNarrative.js

@@ -91,7 +91,7 @@ function* parseNarrativeBody(markdown, fallbackDataset, markdownParser) {
   const titleLinkSelector = "h1 > a:only-child";
   const isTitle = (node) =>
     node.nodeType === Node.ELEMENT_NODE &&
-    node.querySelector(titleLinkSelector) != null;
+    node.querySelector(titleLinkSelector) !== null;
 
   for (const titleLink of doc.querySelectorAll(titleLinkSelector)) {
     const slide = doc.createElement("slide");