build: Add lint rule to ban argument spreads to prevent stack overflow (#17493)

packages/@n8n/eslint-config/package.json

@@ -5,16 +5,16 @@
   "version": "0.0.1",
   "exports": {
     "./base": {
-      "default": "./dist/configs/base.js",
+      "types": "./dist/configs/base.d.js",
-      "types": "./dist/configs/base.d.js"
+      "default": "./dist/configs/base.js"
     },
     "./frontend": {
-      "default": "./dist/configs/frontend.js",
+      "types": "./dist/configs/frontend.d.js",
-      "types": "./dist/configs/frontend.d.js"
+      "default": "./dist/configs/frontend.js"
     },
     "./node": {
-      "default": "./dist/configs/node.js",
+      "types": "./dist/configs/node.d.js",
-      "types": "./dist/configs/node.d.js"
+      "default": "./dist/configs/node.js"
     }
   },
   "scripts": {

packages/@n8n/eslint-config/src/configs/base.ts

@@ -369,7 +369,7 @@ export const baseConfig = tseslint.config(
 			/**
 			 * https://eslint.org/docs/rules/prefer-spread
 			 */
-			'prefer-spread': 'error',
+			'prefer-spread': 'off',
 
 			// These are tuned off since we use `noUnusedLocals` and `noUnusedParameters` now
 			'no-unused-vars': 'off',

packages/@n8n/eslint-config/src/plugin.ts

@@ -24,6 +24,7 @@ export const localRulesPlugin = {
 				'n8n-local-rules/no-interpolation-in-regular-string': 'error',
 				'n8n-local-rules/no-unused-param-in-catch-clause': 'error',
 				'n8n-local-rules/no-useless-catch-throw': 'error',
+				'n8n-local-rules/no-argument-spread': 'warn', // TODO: mark error
 			},
 		},
 	},

packages/@n8n/eslint-config/src/rules/index.ts

@@ -13,6 +13,7 @@ import { NoUntypedConfigClassFieldRule } from './no-untyped-config-class-field.j
 import { NoTopLevelRelativeImportsInBackendModuleRule } from './no-top-level-relative-imports-in-backend-module.js';
 import { NoConstructorInBackendModuleRule } from './no-constructor-in-backend-module.js';
 import type { AnyRuleModule } from '@typescript-eslint/utils/ts-eslint';
+import { NoArgumentSpreadRule } from './no-argument-spread.js';
 
 export const rules = {
 	'no-uncaught-json-parse': NoUncaughtJsonParseRule,
@@ -29,4 +30,5 @@ export const rules = {
 	'no-untyped-config-class-field': NoUntypedConfigClassFieldRule,
 	'no-top-level-relative-imports-in-backend-module': NoTopLevelRelativeImportsInBackendModuleRule,
 	'no-constructor-in-backend-module': NoConstructorInBackendModuleRule,
+	'no-argument-spread': NoArgumentSpreadRule,
 } satisfies Record<string, AnyRuleModule>;

packages/@n8n/eslint-config/src/rules/no-argument-spread.test.ts

@@ -0,0 +1,47 @@
+import { RuleTester } from '@typescript-eslint/rule-tester';
+import { NoArgumentSpreadRule } from './no-argument-spread.js';
+
+const ruleTester = new RuleTester();
+
+ruleTester.run('no-unbounded-argument-spread', NoArgumentSpreadRule, {
+	valid: [
+		{ code: 'fn(1, 2, 3)' },
+		{ code: 'fn(...[1, 2, 3])' },
+		{ code: 'new Foo(...[1, 2])' },
+		{ code: 'fn.apply(null, deps)' },
+		{ code: 'Reflect.construct(Foo, deps)' },
+	],
+
+	invalid: [
+		{
+			code: 'fn(...deps)',
+			output: 'fn.apply(undefined, deps)',
+			errors: [{ messageId: 'replaceWithApply' }],
+		},
+		{
+			code: 'obj.fn(...deps)',
+			output: 'obj.fn.apply(obj, deps)',
+			errors: [{ messageId: 'replaceWithApply' }],
+		},
+		{
+			code: 'instance = metadata.factory(...dependencies);',
+			output: 'instance = metadata.factory.apply(metadata, dependencies);',
+			errors: [{ messageId: 'replaceWithApply' }],
+		},
+		{
+			code: 'new Foo(...deps)',
+			output: 'Reflect.construct(Foo, deps)',
+			errors: [{ messageId: 'replaceWithReflect' }],
+		},
+		{
+			code: 'someFunction(a, ...deps)',
+			output: null, // multiple args — no fix
+			errors: [{ messageId: 'replaceWithApply' }],
+		},
+		{
+			code: 'new Bar(a, ...deps)',
+			output: null,
+			errors: [{ messageId: 'replaceWithReflect' }],
+		},
+	],
+});

packages/@n8n/eslint-config/src/rules/no-argument-spread.ts

@@ -0,0 +1,87 @@
+import { ESLintUtils } from '@typescript-eslint/utils';
+
+export const NoArgumentSpreadRule = ESLintUtils.RuleCreator.withoutDocs({
+	meta: {
+		type: 'problem',
+		docs: {
+			description:
+				'Avoid spreading potentially large arrays in function or constructor calls — can cause stack overflows. Use `.apply` or `Reflect.construct` instead.',
+		},
+		fixable: 'code',
+		messages: {
+			noUnboundedSpread:
+				'Avoid spreading an array in function or constructor calls unless known to be small.',
+			replaceWithApply:
+				'Replace `array.push(...largeArray)` with `array.push.apply(array, largeArray)` to avoid potential stack overflows.',
+			replaceWithReflect:
+				'Replace `new Constructor(...args)` with `Reflect.construct(Constructor, args)` to avoid potential stack overflows.',
+		},
+		schema: [],
+	},
+	defaultOptions: [],
+	create(context) {
+		return {
+			CallExpression(node) {
+				for (const arg of node.arguments) {
+					if (arg.type !== 'SpreadElement') continue;
+
+					const spreadArg = arg.argument;
+
+					// Allow spread of inline arrays
+					if (spreadArg.type === 'ArrayExpression') return;
+
+					// Only autofix if it's the sole argument
+					const canFix = node.arguments.length === 1;
+
+					context.report({
+						node,
+						messageId: 'replaceWithApply',
+						fix: canFix
+							? (fixer) => {
+									const source = context.sourceCode;
+
+									if (node.callee.type === 'MemberExpression') {
+										// Preserve `this`
+										const thisText = source.getText(node.callee.object);
+										const calleeText = source.getText(node.callee);
+										const argText = source.getText(spreadArg);
+										return fixer.replaceText(node, `${calleeText}.apply(${thisText}, ${argText})`);
+									} else {
+										// Not a memberexpression, use undefined as thisArg
+										const calleeText = source.getText(node.callee);
+										const argText = source.getText(spreadArg);
+										return fixer.replaceText(node, `${calleeText}.apply(undefined, ${argText})`);
+									}
+								}
+							: null,
+					});
+				}
+			},
+
+			NewExpression(node) {
+				for (const arg of node.arguments || []) {
+					if (arg.type !== 'SpreadElement') continue;
+
+					const spreadArg = arg.argument;
+
+					if (spreadArg.type === 'ArrayExpression') return;
+
+					const canFix = node.arguments.length === 1;
+
+					context.report({
+						node,
+						messageId: 'replaceWithReflect',
+						fix: canFix
+							? (fixer) => {
+									const source = context.sourceCode;
+									const ctorText = source.getText(node.callee);
+									const argText = source.getText(spreadArg);
+									return fixer.replaceText(node, `Reflect.construct(${ctorText}, ${argText})`);
+								}
+							: null,
+					});
+				}
+			},
+		};
+	},
+});