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node_modules/eslint/lib/rules/no-multi-assign.js

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+/**
+ * @fileoverview Rule to check use of chained assignment expressions
+ * @author Stewart Rand
+ */
+
+"use strict";
+
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "disallow use of chained assignment expressions",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/no-multi-assign"
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            AssignmentExpression(node) {
+                if (["AssignmentExpression", "VariableDeclarator"].indexOf(node.parent.type) !== -1) {
+                    context.report({
+                        node,
+                        message: "Unexpected chained assignment."
+                    });
+                }
+            }
+        };
+
+    }
+};