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app_vue/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: [{
+            type: "object",
+            properties: {
+                ignoreNonDeclaration: {
+                    type: "boolean",
+                    default: false
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            unexpectedChain: "Unexpected chained assignment."
+        }
+    },
+
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+        const options = context.options[0] || {
+            ignoreNonDeclaration: false
+        };
+        const targetParent = options.ignoreNonDeclaration ? ["VariableDeclarator"] : ["AssignmentExpression", "VariableDeclarator"];
+
+        return {
+            AssignmentExpression(node) {
+                if (targetParent.indexOf(node.parent.type) !== -1) {
+                    context.report({
+                        node,
+                        messageId: "unexpectedChain"
+                    });
+                }
+            }
+        };
+
+    }
+};