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feat(validator): detect conditional branch fan-out & connection auto-fixes (#622)

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* feat(auto-fixer): add 5 connection structure fix types

Add automatic repair for malformed workflow connections commonly
generated by AI models:
- connection-numeric-keys: "0","1" keys → main[0], main[1]
- connection-invalid-type: type:"0" → type:"main" (or parent key)
- connection-id-to-name: node ID refs → node name refs
- connection-duplicate-removal: dedup identical connection entries
- connection-input-index: out-of-bounds input index → clamped

Includes collision-safe ID-to-name renames, medium confidence on
merge conflicts and index clamping, shared CONNECTION_FIX_TYPES
constant, and 24 unit tests.

Concieved by Romuald Członkowski - www.aiadvisors.pl/en


* feat(validator): detect IF/Switch/Filter conditional branch fan-out misuse

Add CONDITIONAL_BRANCH_FANOUT warning when conditional nodes have all
connections on main[0] with higher outputs empty, indicating both
branches execute together instead of being split by condition.

Extract getShortNodeType() and getConditionalOutputInfo() helpers to
deduplicate conditional node detection logic.

Conceived by Romuald Czlonkowski - https://www.aiadvisors.pl/en
This commit is contained in:
Romuald Członkowski
2026-03-08 08:41:44 +01:00
committed by GitHub
parent 0918cd5425
commit 25b8a8145d
23 changed files with 2006 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
dist/mcp/handlers-n8n-manager.d.ts.map vendored
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@@ -1 +1 @@
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dist/mcp/handlers-n8n-manager.js vendored
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@@ -212,7 +212,13 @@ const autofixWorkflowSchema = zod_1.z.object({
'node-type-correction',
'webhook-missing-path',
'typeversion-upgrade',
'version-migration'
'version-migration',
'tool-variant-correction',
'connection-numeric-keys',
'connection-invalid-type',
'connection-id-to-name',
'connection-duplicate-removal',
'connection-input-index'
])).optional(),
confidenceThreshold: zod_1.z.enum(['high', 'medium', 'low']).optional().default('medium'),
maxFixes: zod_1.z.number().optional().default(50)

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dist/mcp/tools-n8n-manager.js vendored
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@@ -278,7 +278,7 @@ exports.n8nManagementTools = [
},
{
name: 'n8n_autofix_workflow',
description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths.`,
description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths, connection structure issues (numeric keys, invalid types, ID-to-name, duplicates, out-of-bounds indices).`,
inputSchema: {
type: 'object',
properties: {
@@ -295,7 +295,7 @@ exports.n8nManagementTools = [
description: 'Types of fixes to apply (default: all)',
items: {
type: 'string',
enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration']
enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration', 'tool-variant-correction', 'connection-numeric-keys', 'connection-invalid-type', 'connection-id-to-name', 'connection-duplicate-removal', 'connection-input-index']
}
},
confidenceThreshold: {

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dist/services/workflow-auto-fixer.d.ts vendored
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@@ -5,7 +5,8 @@ import { WorkflowDiffOperation } from '../types/workflow-diff';
import { Workflow } from '../types/n8n-api';
import { PostUpdateGuidance } from './post-update-validator';
export type FixConfidenceLevel = 'high' | 'medium' | 'low';
export type FixType = 'expression-format' | 'typeversion-correction' | 'error-output-config' | 'node-type-correction' | 'webhook-missing-path' | 'typeversion-upgrade' | 'version-migration' | 'tool-variant-correction';
export type FixType = 'expression-format' | 'typeversion-correction' | 'error-output-config' | 'node-type-correction' | 'webhook-missing-path' | 'typeversion-upgrade' | 'version-migration' | 'tool-variant-correction' | 'connection-numeric-keys' | 'connection-invalid-type' | 'connection-id-to-name' | 'connection-duplicate-removal' | 'connection-input-index';
export declare const CONNECTION_FIX_TYPES: FixType[];
export interface AutoFixConfig {
applyFixes: boolean;
fixTypes?: FixType[];
@@ -68,6 +69,12 @@ export declare class WorkflowAutoFixer {
private filterOperationsByFixes;
private calculateStats;
private generateSummary;
private processConnectionFixes;
private fixNumericKeys;
private fixIdToName;
private fixInvalidTypes;
private fixInputIndices;
private fixDuplicateConnections;
private processVersionUpgradeFixes;
private processVersionMigrationFixes;
}

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dist/services/workflow-auto-fixer.d.ts.map vendored
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@@ -1 +1 @@
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310
dist/services/workflow-auto-fixer.js vendored
View File

@@ -3,9 +3,10 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WorkflowAutoFixer = void 0;
exports.WorkflowAutoFixer = exports.CONNECTION_FIX_TYPES = void 0;
exports.isNodeFormatIssue = isNodeFormatIssue;
const crypto_1 = __importDefault(require("crypto"));
const workflow_validator_1 = require("./workflow-validator");
const node_similarity_service_1 = require("./node-similarity-service");
const logger_1 = require("../utils/logger");
const node_version_service_1 = require("./node-version-service");
@@ -13,6 +14,13 @@ const breaking_change_detector_1 = require("./breaking-change-detector");
const node_migration_service_1 = require("./node-migration-service");
const post_update_validator_1 = require("./post-update-validator");
const logger = new logger_1.Logger({ prefix: '[WorkflowAutoFixer]' });
exports.CONNECTION_FIX_TYPES = [
'connection-numeric-keys',
'connection-invalid-type',
'connection-id-to-name',
'connection-duplicate-removal',
'connection-input-index'
];
function isNodeFormatIssue(issue) {
return 'nodeName' in issue && 'nodeId' in issue &&
typeof issue.nodeName === 'string' &&
@@ -72,6 +80,7 @@ class WorkflowAutoFixer {
if (!fullConfig.fixTypes || fullConfig.fixTypes.includes('version-migration')) {
await this.processVersionMigrationFixes(workflow, nodeMap, operations, fixes, postUpdateGuidance);
}
this.processConnectionFixes(workflow, validationResult, fullConfig, operations, fixes);
const filteredFixes = this.filterByConfidence(fixes, fullConfig.confidenceThreshold);
const filteredOperations = this.filterOperationsByFixes(operations, filteredFixes, fixes);
const limitedFixes = filteredFixes.slice(0, fullConfig.maxFixes);
@@ -393,10 +402,14 @@ class WorkflowAutoFixer {
}
filterOperationsByFixes(operations, filteredFixes, allFixes) {
const fixedNodes = new Set(filteredFixes.map(f => f.node));
const hasConnectionFixes = filteredFixes.some(f => exports.CONNECTION_FIX_TYPES.includes(f.type));
return operations.filter(op => {
if (op.type === 'updateNode') {
return fixedNodes.has(op.nodeId || '');
}
if (op.type === 'replaceConnections') {
return hasConnectionFixes;
}
return true;
});
}
@@ -411,7 +424,12 @@ class WorkflowAutoFixer {
'webhook-missing-path': 0,
'typeversion-upgrade': 0,
'version-migration': 0,
'tool-variant-correction': 0
'tool-variant-correction': 0,
'connection-numeric-keys': 0,
'connection-invalid-type': 0,
'connection-id-to-name': 0,
'connection-duplicate-removal': 0,
'connection-input-index': 0
},
byConfidence: {
'high': 0,
@@ -454,11 +472,299 @@ class WorkflowAutoFixer {
if (stats.byType['tool-variant-correction'] > 0) {
parts.push(`${stats.byType['tool-variant-correction']} tool variant ${stats.byType['tool-variant-correction'] === 1 ? 'correction' : 'corrections'}`);
}
const connectionIssueCount = (stats.byType['connection-numeric-keys'] || 0) +
(stats.byType['connection-invalid-type'] || 0) +
(stats.byType['connection-id-to-name'] || 0) +
(stats.byType['connection-duplicate-removal'] || 0) +
(stats.byType['connection-input-index'] || 0);
if (connectionIssueCount > 0) {
parts.push(`${connectionIssueCount} connection ${connectionIssueCount === 1 ? 'issue' : 'issues'}`);
}
if (parts.length === 0) {
return `Fixed ${stats.total} ${stats.total === 1 ? 'issue' : 'issues'}`;
}
return `Fixed ${parts.join(', ')}`;
}
processConnectionFixes(workflow, validationResult, config, operations, fixes) {
if (!workflow.connections || Object.keys(workflow.connections).length === 0) {
return;
}
const idToNameMap = new Map();
const nameSet = new Set();
for (const node of workflow.nodes) {
idToNameMap.set(node.id, node.name);
nameSet.add(node.name);
}
const conn = JSON.parse(JSON.stringify(workflow.connections));
let anyFixed = false;
if (!config.fixTypes || config.fixTypes.includes('connection-numeric-keys')) {
const numericKeyResult = this.fixNumericKeys(conn);
if (numericKeyResult.length > 0) {
fixes.push(...numericKeyResult);
anyFixed = true;
}
}
if (!config.fixTypes || config.fixTypes.includes('connection-id-to-name')) {
const idToNameResult = this.fixIdToName(conn, idToNameMap, nameSet);
if (idToNameResult.length > 0) {
fixes.push(...idToNameResult);
anyFixed = true;
}
}
if (!config.fixTypes || config.fixTypes.includes('connection-invalid-type')) {
const invalidTypeResult = this.fixInvalidTypes(conn);
if (invalidTypeResult.length > 0) {
fixes.push(...invalidTypeResult);
anyFixed = true;
}
}
if (!config.fixTypes || config.fixTypes.includes('connection-input-index')) {
const inputIndexResult = this.fixInputIndices(conn, validationResult, workflow);
if (inputIndexResult.length > 0) {
fixes.push(...inputIndexResult);
anyFixed = true;
}
}
if (!config.fixTypes || config.fixTypes.includes('connection-duplicate-removal')) {
const dedupResult = this.fixDuplicateConnections(conn);
if (dedupResult.length > 0) {
fixes.push(...dedupResult);
anyFixed = true;
}
}
if (anyFixed) {
const op = {
type: 'replaceConnections',
connections: conn
};
operations.push(op);
}
}
fixNumericKeys(conn) {
const fixes = [];
const sourceNodes = Object.keys(conn);
for (const sourceName of sourceNodes) {
const nodeConn = conn[sourceName];
const numericKeys = Object.keys(nodeConn).filter(k => /^\d+$/.test(k));
if (numericKeys.length === 0)
continue;
if (!nodeConn['main']) {
nodeConn['main'] = [];
}
for (const numKey of numericKeys) {
const index = parseInt(numKey, 10);
const entries = nodeConn[numKey];
while (nodeConn['main'].length <= index) {
nodeConn['main'].push([]);
}
const hadExisting = nodeConn['main'][index] && nodeConn['main'][index].length > 0;
if (Array.isArray(entries)) {
for (const outputGroup of entries) {
if (Array.isArray(outputGroup)) {
nodeConn['main'][index] = [
...nodeConn['main'][index],
...outputGroup
];
}
}
}
if (hadExisting) {
logger.warn(`Merged numeric key "${numKey}" into existing main[${index}] on node "${sourceName}" - dedup pass will clean exact duplicates`);
}
fixes.push({
node: sourceName,
field: `connections.${sourceName}.${numKey}`,
type: 'connection-numeric-keys',
before: numKey,
after: `main[${index}]`,
confidence: hadExisting ? 'medium' : 'high',
description: hadExisting
? `Merged numeric connection key "${numKey}" into existing main[${index}] on node "${sourceName}"`
: `Converted numeric connection key "${numKey}" to main[${index}] on node "${sourceName}"`
});
delete nodeConn[numKey];
}
}
return fixes;
}
fixIdToName(conn, idToNameMap, nameSet) {
const fixes = [];
const renames = [];
const sourceKeys = Object.keys(conn);
for (const sourceKey of sourceKeys) {
if (idToNameMap.has(sourceKey) && !nameSet.has(sourceKey)) {
renames.push({ oldKey: sourceKey, newKey: idToNameMap.get(sourceKey) });
}
}
const newKeyCount = new Map();
for (const r of renames) {
newKeyCount.set(r.newKey, (newKeyCount.get(r.newKey) || 0) + 1);
}
const safeRenames = renames.filter(r => {
if ((newKeyCount.get(r.newKey) || 0) > 1) {
logger.warn(`Skipping ambiguous ID-to-name rename: "${r.oldKey}" → "${r.newKey}" (multiple IDs map to same name)`);
return false;
}
return true;
});
for (const { oldKey, newKey } of safeRenames) {
conn[newKey] = conn[oldKey];
delete conn[oldKey];
fixes.push({
node: newKey,
field: `connections.sourceKey`,
type: 'connection-id-to-name',
before: oldKey,
after: newKey,
confidence: 'high',
description: `Replaced node ID "${oldKey}" with name "${newKey}" as connection source key`
});
}
for (const sourceName of Object.keys(conn)) {
const nodeConn = conn[sourceName];
for (const outputKey of Object.keys(nodeConn)) {
const outputs = nodeConn[outputKey];
if (!Array.isArray(outputs))
continue;
for (const outputGroup of outputs) {
if (!Array.isArray(outputGroup))
continue;
for (const entry of outputGroup) {
if (entry && entry.node && idToNameMap.has(entry.node) && !nameSet.has(entry.node)) {
const oldNode = entry.node;
const newNode = idToNameMap.get(entry.node);
entry.node = newNode;
fixes.push({
node: sourceName,
field: `connections.${sourceName}.${outputKey}[].node`,
type: 'connection-id-to-name',
before: oldNode,
after: newNode,
confidence: 'high',
description: `Replaced target node ID "${oldNode}" with name "${newNode}" in connection from "${sourceName}"`
});
}
}
}
}
}
return fixes;
}
fixInvalidTypes(conn) {
const fixes = [];
for (const sourceName of Object.keys(conn)) {
const nodeConn = conn[sourceName];
for (const outputKey of Object.keys(nodeConn)) {
const outputs = nodeConn[outputKey];
if (!Array.isArray(outputs))
continue;
for (const outputGroup of outputs) {
if (!Array.isArray(outputGroup))
continue;
for (const entry of outputGroup) {
if (entry && entry.type && !workflow_validator_1.VALID_CONNECTION_TYPES.has(entry.type)) {
const oldType = entry.type;
const newType = workflow_validator_1.VALID_CONNECTION_TYPES.has(outputKey) ? outputKey : 'main';
entry.type = newType;
fixes.push({
node: sourceName,
field: `connections.${sourceName}.${outputKey}[].type`,
type: 'connection-invalid-type',
before: oldType,
after: newType,
confidence: 'high',
description: `Fixed invalid connection type "${oldType}" → "${newType}" in connection from "${sourceName}" to "${entry.node}"`
});
}
}
}
}
}
return fixes;
}
fixInputIndices(conn, validationResult, workflow) {
const fixes = [];
for (const error of validationResult.errors) {
if (error.code !== 'INPUT_INDEX_OUT_OF_BOUNDS')
continue;
const targetNodeName = error.nodeName;
if (!targetNodeName)
continue;
const match = error.message.match(/Input index (\d+).*?has (\d+) main input/);
if (!match) {
logger.warn(`Could not parse INPUT_INDEX_OUT_OF_BOUNDS error for node "${targetNodeName}": ${error.message}`);
continue;
}
const badIndex = parseInt(match[1], 10);
const inputCount = parseInt(match[2], 10);
const clampedIndex = inputCount > 1 ? Math.min(badIndex, inputCount - 1) : 0;
for (const sourceName of Object.keys(conn)) {
const nodeConn = conn[sourceName];
for (const outputKey of Object.keys(nodeConn)) {
const outputs = nodeConn[outputKey];
if (!Array.isArray(outputs))
continue;
for (const outputGroup of outputs) {
if (!Array.isArray(outputGroup))
continue;
for (const entry of outputGroup) {
if (entry && entry.node === targetNodeName && entry.index === badIndex) {
entry.index = clampedIndex;
fixes.push({
node: sourceName,
field: `connections.${sourceName}.${outputKey}[].index`,
type: 'connection-input-index',
before: badIndex,
after: clampedIndex,
confidence: 'medium',
description: `Clamped input index ${badIndex} → ${clampedIndex} for target node "${targetNodeName}" (has ${inputCount} input${inputCount === 1 ? '' : 's'})`
});
}
}
}
}
}
}
return fixes;
}
fixDuplicateConnections(conn) {
const fixes = [];
for (const sourceName of Object.keys(conn)) {
const nodeConn = conn[sourceName];
for (const outputKey of Object.keys(nodeConn)) {
const outputs = nodeConn[outputKey];
if (!Array.isArray(outputs))
continue;
for (let i = 0; i < outputs.length; i++) {
const outputGroup = outputs[i];
if (!Array.isArray(outputGroup))
continue;
const seen = new Set();
const deduped = [];
for (const entry of outputGroup) {
const key = JSON.stringify({ node: entry.node, type: entry.type, index: entry.index });
if (seen.has(key)) {
fixes.push({
node: sourceName,
field: `connections.${sourceName}.${outputKey}[${i}]`,
type: 'connection-duplicate-removal',
before: entry,
after: null,
confidence: 'high',
description: `Removed duplicate connection from "${sourceName}" to "${entry.node}" (type: ${entry.type}, index: ${entry.index})`
});
}
else {
seen.add(key);
deduped.push(entry);
}
}
outputs[i] = deduped;
}
}
}
return fixes;
}
async processVersionUpgradeFixes(workflow, nodeMap, operations, fixes, postUpdateGuidance) {
if (!this.versionService || !this.migrationService || !this.postUpdateValidator) {
logger.warn('Version services not initialized. Skipping version upgrade fixes.');

2
dist/services/workflow-auto-fixer.js.map vendored
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File diff suppressed because one or more lines are too long

6
dist/services/workflow-validator.d.ts vendored
View File

@@ -1,5 +1,6 @@
import { NodeRepository } from '../database/node-repository';
import { EnhancedConfigValidator } from './enhanced-config-validator';
export declare const VALID_CONNECTION_TYPES: Set<string>;
interface WorkflowNode {
id: string;
name: string;
@@ -84,7 +85,12 @@ export declare class WorkflowValidator {
private validateErrorOutputConfiguration;
private validateAIToolConnection;
private validateAIToolSource;
private getNodeOutputTypes;
private validateNotAISubNode;
private getShortNodeType;
private getConditionalOutputInfo;
private validateOutputIndexBounds;
private validateConditionalBranchUsage;
private validateInputIndexBounds;
private flagOrphanedNodes;
private validateTriggerReachability;

2
dist/services/workflow-validator.d.ts.map vendored
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@@ -1 +1 @@
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119
dist/services/workflow-validator.js vendored
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@@ -3,7 +3,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WorkflowValidator = void 0;
exports.WorkflowValidator = exports.VALID_CONNECTION_TYPES = void 0;
const crypto_1 = __importDefault(require("crypto"));
const expression_validator_1 = require("./expression-validator");
const expression_format_validator_1 = require("./expression-format-validator");
@@ -16,7 +16,7 @@ const node_type_utils_1 = require("../utils/node-type-utils");
const node_classification_1 = require("../utils/node-classification");
const tool_variant_generator_1 = require("./tool-variant-generator");
const logger = new logger_1.Logger({ prefix: '[WorkflowValidator]' });
const VALID_CONNECTION_TYPES = new Set([
exports.VALID_CONNECTION_TYPES = new Set([
'main',
'error',
...ai_node_validator_1.AI_CONNECTION_TYPES,
@@ -403,7 +403,7 @@ class WorkflowValidator {
continue;
}
for (const [outputKey, outputConnections] of Object.entries(outputs)) {
if (!VALID_CONNECTION_TYPES.has(outputKey)) {
if (!exports.VALID_CONNECTION_TYPES.has(outputKey)) {
let suggestion = '';
if (/^\d+$/.test(outputKey)) {
suggestion = ` If you meant to use output index ${outputKey}, use main[${outputKey}] instead.`;
@@ -411,7 +411,7 @@ class WorkflowValidator {
result.errors.push({
type: 'error',
nodeName: sourceName,
message: `Unknown connection output key "${outputKey}" on node "${sourceName}". Valid keys are: ${[...VALID_CONNECTION_TYPES].join(', ')}.${suggestion}`,
message: `Unknown connection output key "${outputKey}" on node "${sourceName}". Valid keys are: ${[...exports.VALID_CONNECTION_TYPES].join(', ')}.${suggestion}`,
code: 'UNKNOWN_CONNECTION_KEY'
});
result.statistics.invalidConnections++;
@@ -422,6 +422,9 @@ class WorkflowValidator {
if (outputKey === 'ai_tool') {
this.validateAIToolSource(sourceNode, result);
}
if (outputKey === 'main') {
this.validateNotAISubNode(sourceNode, result);
}
this.validateConnectionOutputs(sourceName, outputConnections, nodeMap, nodeIdMap, result, outputKey);
}
}
@@ -443,6 +446,7 @@ class WorkflowValidator {
if (outputType === 'main' && sourceNode) {
this.validateErrorOutputConfiguration(sourceName, sourceNode, outputs, nodeMap, result);
this.validateOutputIndexBounds(sourceNode, outputs, result);
this.validateConditionalBranchUsage(sourceNode, outputs, result);
}
outputs.forEach((outputConnections, outputIndex) => {
if (!outputConnections)
@@ -456,7 +460,7 @@ class WorkflowValidator {
result.statistics.invalidConnections++;
return;
}
if (connection.type && !VALID_CONNECTION_TYPES.has(connection.type)) {
if (connection.type && !exports.VALID_CONNECTION_TYPES.has(connection.type)) {
let suggestion = '';
if (/^\d+$/.test(connection.type)) {
suggestion = ` Numeric types are not valid - use "main", "error", or an AI connection type.`;
@@ -644,6 +648,57 @@ class WorkflowValidator {
code: 'INVALID_AI_TOOL_SOURCE'
});
}
getNodeOutputTypes(nodeType) {
const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(nodeType);
const nodeInfo = this.nodeRepository.getNode(normalizedType);
if (!nodeInfo || !nodeInfo.outputs)
return null;
const outputs = nodeInfo.outputs;
if (!Array.isArray(outputs))
return null;
for (const output of outputs) {
if (typeof output === 'string' && output.startsWith('={{')) {
return null;
}
}
return outputs;
}
validateNotAISubNode(sourceNode, result) {
const outputTypes = this.getNodeOutputTypes(sourceNode.type);
if (!outputTypes)
return;
const hasMainOutput = outputTypes.some(t => t === 'main');
if (hasMainOutput)
return;
const aiTypes = outputTypes.filter(t => t !== 'main');
const expectedType = aiTypes[0] || 'ai_languageModel';
result.errors.push({
type: 'error',
nodeId: sourceNode.id,
nodeName: sourceNode.name,
message: `Node "${sourceNode.name}" (${sourceNode.type}) is an AI sub-node that outputs "${expectedType}" connections. ` +
`It cannot be used with "main" connections. Connect it to an AI Agent or Chain via "${expectedType}" instead.`,
code: 'AI_SUBNODE_MAIN_CONNECTION'
});
}
getShortNodeType(sourceNode) {
const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(sourceNode.type);
return normalizedType.replace(/^(n8n-)?nodes-base\./, '');
}
getConditionalOutputInfo(sourceNode) {
const shortType = this.getShortNodeType(sourceNode);
if (shortType === 'if' || shortType === 'filter') {
return { shortType, expectedOutputs: 2 };
}
if (shortType === 'switch') {
const rules = sourceNode.parameters?.rules?.values || sourceNode.parameters?.rules;
if (Array.isArray(rules)) {
return { shortType, expectedOutputs: rules.length + 1 };
}
return null;
}
return null;
}
validateOutputIndexBounds(sourceNode, outputs, result) {
const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(sourceNode.type);
const nodeInfo = this.nodeRepository.getNode(normalizedType);
@@ -658,18 +713,12 @@ class WorkflowValidator {
}
if (mainOutputCount === 0)
return;
const shortType = normalizedType.replace(/^(n8n-)?nodes-base\./, '');
if (shortType === 'switch') {
const rules = sourceNode.parameters?.rules?.values || sourceNode.parameters?.rules;
if (Array.isArray(rules)) {
mainOutputCount = rules.length + 1;
}
else {
return;
}
const conditionalInfo = this.getConditionalOutputInfo(sourceNode);
if (conditionalInfo) {
mainOutputCount = conditionalInfo.expectedOutputs;
}
if (shortType === 'if' || shortType === 'filter') {
mainOutputCount = 2;
else if (this.getShortNodeType(sourceNode) === 'switch') {
return;
}
if (sourceNode.onError === 'continueErrorOutput') {
mainOutputCount += 1;
@@ -691,6 +740,44 @@ class WorkflowValidator {
}
}
}
validateConditionalBranchUsage(sourceNode, outputs, result) {
const conditionalInfo = this.getConditionalOutputInfo(sourceNode);
if (!conditionalInfo || conditionalInfo.expectedOutputs < 2)
return;
const { shortType, expectedOutputs } = conditionalInfo;
const main0Count = outputs[0]?.length || 0;
if (main0Count < 2)
return;
const hasHigherIndexConnections = outputs.slice(1).some(conns => conns && conns.length > 0);
if (hasHigherIndexConnections)
return;
let message;
if (shortType === 'if' || shortType === 'filter') {
const isFilter = shortType === 'filter';
const displayName = isFilter ? 'Filter' : 'IF';
const trueLabel = isFilter ? 'matched' : 'true';
const falseLabel = isFilter ? 'unmatched' : 'false';
message = `${displayName} node "${sourceNode.name}" has ${main0Count} connections on the "${trueLabel}" branch (main[0]) ` +
`but no connections on the "${falseLabel}" branch (main[1]). ` +
`All ${main0Count} target nodes execute together on the "${trueLabel}" branch, ` +
`while the "${falseLabel}" branch has no effect. ` +
`Split connections: main[0] for ${trueLabel}, main[1] for ${falseLabel}.`;
}
else {
message = `Switch node "${sourceNode.name}" has ${main0Count} connections on output 0 ` +
`but no connections on any other outputs (1-${expectedOutputs - 1}). ` +
`All ${main0Count} target nodes execute together on output 0, ` +
`while other switch branches have no effect. ` +
`Distribute connections across outputs to match switch rules.`;
}
result.warnings.push({
type: 'warning',
nodeId: sourceNode.id,
nodeName: sourceNode.name,
message,
code: 'CONDITIONAL_BRANCH_FANOUT'
});
}
validateInputIndexBounds(sourceName, targetNode, connection, result) {
const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(targetNode.type);
const nodeInfo = this.nodeRepository.getNode(normalizedType);

2
dist/services/workflow-validator.js.map vendored
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