first commit

packages/@n8n/eslint-config/src/rules/no-json-parse-json-stringify.ts

@@ -0,0 +1,48 @@
+import { isJsonParseCall, isJsonStringifyCall } from '../utils/json.js';
+import { ESLintUtils, TSESTree } from '@typescript-eslint/utils';
+
+export const NoJsonParseJsonStringifyRule = ESLintUtils.RuleCreator.withoutDocs({
+	meta: {
+		type: 'problem',
+		docs: {
+			description:
+				'Calls to `JSON.parse(JSON.stringify(arg))` must be replaced with `deepCopy(arg)` from `n8n-workflow`.',
+		},
+		schema: [],
+		messages: {
+			noJsonParseJsonStringify: 'Replace with `deepCopy({{ argText }})`',
+		},
+		fixable: 'code',
+	},
+	defaultOptions: [],
+	create(context) {
+		return {
+			CallExpression(node) {
+				if (isJsonParseCall(node) && isJsonStringifyCall(node)) {
+					const [callExpression] = node.arguments;
+
+					if (callExpression.type !== TSESTree.AST_NODE_TYPES.CallExpression) {
+						return;
+					}
+
+					const { arguments: args } = callExpression;
+
+					if (!Array.isArray(args) || args.length !== 1) return;
+
+					const [arg] = args;
+
+					if (!arg) return;
+
+					const argText = context.sourceCode.getText(arg);
+
+					context.report({
+						messageId: 'noJsonParseJsonStringify',
+						node,
+						data: { argText },
+						fix: (fixer) => fixer.replaceText(node, `deepCopy(${argText})`),
+					});
+				}
+			},
+		};
+	},
+});