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web/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
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		defaultOptions: [
+			{
+				ignoreNonDeclaration: false,
+			},
+		],
+
+		docs: {
+			description: "Disallow use of chained assignment expressions",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-multi-assign",
+		},
+
+		schema: [
+			{
+				type: "object",
+				properties: {
+					ignoreNonDeclaration: {
+						type: "boolean",
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+
+		messages: {
+			unexpectedChain: "Unexpected chained assignment.",
+		},
+	},
+
+	create(context) {
+		const [{ ignoreNonDeclaration }] = context.options;
+		const selectors = [
+			"VariableDeclarator > AssignmentExpression.init",
+			"PropertyDefinition > AssignmentExpression.value",
+		];
+
+		if (!ignoreNonDeclaration) {
+			selectors.push("AssignmentExpression > AssignmentExpression.right");
+		}
+
+		return {
+			[selectors](node) {
+				context.report({
+					node,
+					messageId: "unexpectedChain",
+				});
+			},
+		};
+	},
+};