build: Update ESLint to v9 (#16639)

packages/@n8n/eslint-config/src/rules/no-plain-errors.ts

@@ -0,0 +1,49 @@
+import { ESLintUtils, TSESTree } from '@typescript-eslint/utils';
+
+export const NoPlainErrorsRule = ESLintUtils.RuleCreator.withoutDocs({
+	meta: {
+		type: 'problem',
+		docs: {
+			description:
+				'Only `ApplicationError` (from the `workflow` package) or its child classes must be thrown. This ensures the error will be normalized when reported to Sentry, if applicable.',
+		},
+		messages: {
+			useApplicationError:
+				'Throw an `ApplicationError` (from the `workflow` package) or its child classes.',
+		},
+		fixable: 'code',
+		schema: [],
+	},
+	defaultOptions: [],
+	create(context) {
+		return {
+			ThrowStatement(node) {
+				if (!node.argument) return;
+
+				const isNewError =
+					node.argument.type === TSESTree.AST_NODE_TYPES.NewExpression &&
+					node.argument.callee.type === TSESTree.AST_NODE_TYPES.Identifier &&
+					node.argument.callee.name === 'Error';
+
+				const isNewlessError =
+					node.argument.type === TSESTree.AST_NODE_TYPES.CallExpression &&
+					node.argument.callee.type === TSESTree.AST_NODE_TYPES.Identifier &&
+					node.argument.callee.name === 'Error';
+
+				if (isNewError || isNewlessError) {
+					return context.report({
+						messageId: 'useApplicationError',
+						node,
+						fix: (fixer) =>
+							fixer.replaceText(
+								node,
+								`throw new ApplicationError(${(node.argument as TSESTree.CallExpression).arguments
+									.map((arg) => context.sourceCode.getText(arg))
+									.join(', ')})`,
+							),
+					});
+				}
+			},
+		};
+	},
+});