tools: add number-isnan rule

PR-URL: https://github.com/nodejs/node/pull/17556
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/eslint-rules/number-isnan.js b/tools/eslint-rules/number-isnan.js
new file mode 100644
index 0000000000..885c38be8b
--- /dev/null
+++ b/tools/eslint-rules/number-isnan.js
@@ -0,0 +1,14 @@
+'use strict';
+
+const astSelector = "CallExpression[callee.name='isNaN']";
+const msg = 'Please use Number.isNaN instead of the global isNaN function';
+
+module.exports = function(context) {
+  function report(node) {
+    context.report(node, msg);
+  }
+
+  return {
+    [astSelector]: report
+  };
+};