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node_modules/eslint/lib/rules/no-sparse-arrays.js

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+/**
+ * @fileoverview Disallow sparse arrays
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow sparse arrays",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-sparse-arrays"
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            ArrayExpression(node) {
+
+                const emptySpot = node.elements.indexOf(null) > -1;
+
+                if (emptySpot) {
+                    context.report({ node, message: "Unexpected comma in middle of array." });
+                }
+            }
+
+        };
+
+    }
+};