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fix: code validator false positives and null property removal (#294, #293, #611) (#637)

Browse Source 
- Fix $() node reference triggering "Invalid $ usage" warning by adding ( and _ to regex lookahead
- Fix helper function primitive returns triggering "Cannot return primitive values" error
- Fix null values in diff engine causing Zod validation errors — null now deletes properties
- Update property removal docs from undefined to null

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Romuald Członkowski
2026-03-15 11:26:44 +01:00
committed by GitHub
parent 599bc664d0
commit 65ab94deb2
16 changed files with 339 additions and 89 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
dist/services/node-specific-validators.d.ts.map vendored
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@@ -1 +1 @@
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5
dist/services/node-specific-validators.js vendored
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@@ -1067,7 +1067,8 @@ class NodeSpecificValidators {
fix: 'Wrap in array: return [{json: yourObject}]'
});
}
if (/return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
const hasHelperFunctions = /(?:function\s+\w+\s*\(|(?:const|let|var)\s+\w+\s*=\s*(?:async\s+)?(?:function|\([^)]*\)\s*=>|\w+\s*=>))/.test(code);
if (!hasHelperFunctions && /return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
errors.push({
type: 'invalid_value',
property: 'jsCode',
@@ -1149,7 +1150,7 @@ class NodeSpecificValidators {
}
});
if (language === 'javaScript') {
if (/\$(?![a-zA-Z])/.test(code) && !code.includes('${')) {
if (/\$(?![a-zA-Z_(])/.test(code) && !code.includes('${')) {
warnings.push({
type: 'best_practice',
message: 'Invalid $ usage detected',

2
dist/services/node-specific-validators.js.map vendored
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4
dist/services/workflow-diff-engine.d.ts vendored
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@@ -3,6 +3,10 @@ import { Workflow } from '../types/n8n-api';
export declare class WorkflowDiffEngine {
private renameMap;
private warnings;
private modifiedNodeIds;
private removedNodeNames;
private tagsToAdd;
private tagsToRemove;
applyDiff(workflow: Workflow, request: WorkflowDiffRequest): Promise<WorkflowDiffResult>;
private validateOperation;
private applyOperation;

2
dist/services/workflow-diff-engine.d.ts.map vendored
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@@ -1 +1 @@
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106
dist/services/workflow-diff-engine.js vendored
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@@ -10,11 +10,19 @@ class WorkflowDiffEngine {
constructor() {
this.renameMap = new Map();
this.warnings = [];
this.modifiedNodeIds = new Set();
this.removedNodeNames = new Set();
this.tagsToAdd = [];
this.tagsToRemove = [];
}
async applyDiff(workflow, request) {
try {
this.renameMap.clear();
this.warnings = [];
this.modifiedNodeIds.clear();
this.removedNodeNames.clear();
this.tagsToAdd = [];
this.tagsToRemove = [];
const workflowCopy = JSON.parse(JSON.stringify(workflow));
const nodeOperationTypes = ['addNode', 'removeNode', 'updateNode', 'moveNode', 'enableNode', 'disableNode'];
const nodeOperations = [];
@@ -82,7 +90,9 @@ class WorkflowDiffEngine {
errors: errors.length > 0 ? errors : undefined,
warnings: this.warnings.length > 0 ? this.warnings : undefined,
applied: appliedIndices,
failed: failedIndices
failed: failedIndices,
tagsToAdd: this.tagsToAdd.length > 0 ? this.tagsToAdd : undefined,
tagsToRemove: this.tagsToRemove.length > 0 ? this.tagsToRemove : undefined
};
}
else {
@@ -142,8 +152,15 @@ class WorkflowDiffEngine {
};
}
}
workflowCopy.nodes = workflowCopy.nodes.map((node) => (0, node_sanitizer_1.sanitizeNode)(node));
logger.debug('Applied full-workflow sanitization to all nodes');
if (this.modifiedNodeIds.size > 0) {
workflowCopy.nodes = workflowCopy.nodes.map((node) => {
if (this.modifiedNodeIds.has(node.id)) {
return (0, node_sanitizer_1.sanitizeNode)(node);
}
return node;
});
logger.debug(`Sanitized ${this.modifiedNodeIds.size} modified nodes`);
}
if (request.validateOnly) {
return {
success: true,
@@ -162,7 +179,9 @@ class WorkflowDiffEngine {
message: `Successfully applied ${operationsApplied} operations (${nodeOperations.length} node ops, ${otherOperations.length} other ops)`,
warnings: this.warnings.length > 0 ? this.warnings : undefined,
shouldActivate: shouldActivate || undefined,
shouldDeactivate: shouldDeactivate || undefined
shouldDeactivate: shouldDeactivate || undefined,
tagsToAdd: this.tagsToAdd.length > 0 ? this.tagsToAdd : undefined,
tagsToRemove: this.tagsToRemove.length > 0 ? this.tagsToRemove : undefined
};
}
}
@@ -302,7 +321,7 @@ class WorkflowDiffEngine {
return `Invalid parameter 'changes'. The updateNode operation requires 'updates' (not 'changes'). Example: {type: "updateNode", nodeId: "abc", updates: {name: "New Name", "parameters.url": "https://example.com"}}`;
}
if (!operation.updates) {
return `Missing required parameter 'updates'. The updateNode operation requires an 'updates' object containing properties to modify. Example: {type: "updateNode", nodeId: "abc", updates: {name: "New Name"}}`;
return `Missing required parameter 'updates'. The updateNode operation requires an 'updates' object. Correct structure: {type: "updateNode", nodeId: "abc-123" OR nodeName: "My Node", updates: {name: "New Name", "parameters.url": "https://example.com"}}`;
}
const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
if (!node) {
@@ -382,12 +401,18 @@ class WorkflowDiffEngine {
const sourceNode = this.findNode(workflow, operation.source, operation.source);
const targetNode = this.findNode(workflow, operation.target, operation.target);
if (!sourceNode) {
if (this.removedNodeNames.has(operation.source)) {
return `Source node "${operation.source}" was already removed by a prior removeNode operation. Its connections were automatically cleaned up — no separate removeConnection needed.`;
}
const availableNodes = workflow.nodes
.map(n => `"${n.name}" (id: ${n.id.substring(0, 8)}...)`)
.join(', ');
return `Source node not found: "${operation.source}". Available nodes: ${availableNodes}. Tip: Use node ID for names with special characters.`;
}
if (!targetNode) {
if (this.removedNodeNames.has(operation.target)) {
return `Target node "${operation.target}" was already removed by a prior removeNode operation. Its connections were automatically cleaned up — no separate removeConnection needed.`;
}
const availableNodes = workflow.nodes
.map(n => `"${n.name}" (id: ${n.id.substring(0, 8)}...)`)
.join(', ');
@@ -461,34 +486,40 @@ class WorkflowDiffEngine {
executeOnce: operation.node.executeOnce
};
const sanitizedNode = (0, node_sanitizer_1.sanitizeNode)(newNode);
this.modifiedNodeIds.add(sanitizedNode.id);
workflow.nodes.push(sanitizedNode);
}
applyRemoveNode(workflow, operation) {
const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
if (!node)
return;
this.removedNodeNames.add(node.name);
const index = workflow.nodes.findIndex(n => n.id === node.id);
if (index !== -1) {
workflow.nodes.splice(index, 1);
}
delete workflow.connections[node.name];
Object.keys(workflow.connections).forEach(sourceName => {
const sourceConnections = workflow.connections[sourceName];
Object.keys(sourceConnections).forEach(outputName => {
sourceConnections[outputName] = sourceConnections[outputName].map(connections => connections.filter(conn => conn.node !== node.name)).filter(connections => connections.length > 0);
if (sourceConnections[outputName].length === 0) {
for (const [sourceName, sourceConnections] of Object.entries(workflow.connections)) {
for (const [outputName, outputConns] of Object.entries(sourceConnections)) {
sourceConnections[outputName] = outputConns.map(connections => connections.filter(conn => conn.node !== node.name));
const trimmed = sourceConnections[outputName];
while (trimmed.length > 0 && trimmed[trimmed.length - 1].length === 0) {
trimmed.pop();
}
if (trimmed.length === 0) {
delete sourceConnections[outputName];
}
});
}
if (Object.keys(sourceConnections).length === 0) {
delete workflow.connections[sourceName];
}
});
}
}
applyUpdateNode(workflow, operation) {
const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
if (!node)
return;
this.modifiedNodeIds.add(node.id);
if (operation.updates.name && operation.updates.name !== node.name) {
const oldName = node.name;
const newName = operation.updates.name;
@@ -521,8 +552,13 @@ class WorkflowDiffEngine {
}
resolveSmartParameters(workflow, operation) {
const sourceNode = this.findNode(workflow, operation.source, operation.source);
let sourceOutput = operation.sourceOutput ?? 'main';
let sourceOutput = String(operation.sourceOutput ?? 'main');
let sourceIndex = operation.sourceIndex ?? 0;
if (/^\d+$/.test(sourceOutput) && operation.sourceIndex === undefined
&& operation.branch === undefined && operation.case === undefined) {
sourceIndex = parseInt(sourceOutput, 10);
sourceOutput = 'main';
}
if (operation.branch !== undefined && operation.sourceIndex === undefined) {
if (sourceNode?.type === 'n8n-nodes-base.if') {
sourceIndex = operation.branch === 'true' ? 0 : 1;
@@ -556,7 +592,7 @@ class WorkflowDiffEngine {
if (!sourceNode || !targetNode)
return;
const { sourceOutput, sourceIndex } = this.resolveSmartParameters(workflow, operation);
const targetInput = operation.targetInput ?? sourceOutput;
const targetInput = String(operation.targetInput ?? sourceOutput);
const targetIndex = operation.targetIndex ?? 0;
if (!workflow.connections[sourceNode.name]) {
workflow.connections[sourceNode.name] = {};
@@ -581,12 +617,9 @@ class WorkflowDiffEngine {
const sourceNode = this.findNode(workflow, operation.source, operation.source);
const targetNode = this.findNode(workflow, operation.target, operation.target);
if (!sourceNode || !targetNode) {
if (operation.ignoreErrors) {
return;
}
return;
}
const sourceOutput = operation.sourceOutput || 'main';
const sourceOutput = String(operation.sourceOutput ?? 'main');
const connections = workflow.connections[sourceNode.name]?.[sourceOutput];
if (!connections)
return;
@@ -633,19 +666,21 @@ class WorkflowDiffEngine {
workflow.name = operation.name;
}
applyAddTag(workflow, operation) {
if (!workflow.tags) {
workflow.tags = [];
const removeIdx = this.tagsToRemove.indexOf(operation.tag);
if (removeIdx !== -1) {
this.tagsToRemove.splice(removeIdx, 1);
}
if (!workflow.tags.includes(operation.tag)) {
workflow.tags.push(operation.tag);
if (!this.tagsToAdd.includes(operation.tag)) {
this.tagsToAdd.push(operation.tag);
}
}
applyRemoveTag(workflow, operation) {
if (!workflow.tags)
return;
const index = workflow.tags.indexOf(operation.tag);
if (index !== -1) {
workflow.tags.splice(index, 1);
const addIdx = this.tagsToAdd.indexOf(operation.tag);
if (addIdx !== -1) {
this.tagsToAdd.splice(addIdx, 1);
}
if (!this.tagsToRemove.includes(operation.tag)) {
this.tagsToRemove.push(operation.tag);
}
}
validateActivateWorkflow(workflow, operation) {
@@ -734,7 +769,10 @@ class WorkflowDiffEngine {
return false;
}
return true;
})).filter(conns => conns.length > 0);
}));
while (filteredConnections.length > 0 && filteredConnections[filteredConnections.length - 1].length === 0) {
filteredConnections.pop();
}
if (filteredConnections.length === 0) {
delete outputs[outputName];
}
@@ -818,12 +856,20 @@ class WorkflowDiffEngine {
let current = obj;
for (let i = 0; i < keys.length - 1; i++) {
const key = keys[i];
if (!(key in current) || typeof current[key] !== 'object') {
if (!(key in current) || typeof current[key] !== 'object' || current[key] === null) {
if (value === null)
return;
current[key] = {};
}
current = current[key];
}
current[keys[keys.length - 1]] = value;
const finalKey = keys[keys.length - 1];
if (value === null) {
delete current[finalKey];
}
else {
current[finalKey] = value;
}
}
}
exports.WorkflowDiffEngine = WorkflowDiffEngine;

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