Disallow string literals in node description inputs/outputs — use NodeConnectionTypes enum instead (@n8n/community-nodes/node-connection-type-literal)

💼 This rule is enabled in the following configs: ✅ recommended, ☑️ recommendedWithoutN8nCloudSupport.

🔧 This rule is automatically fixable by the --fix CLI option.

Rule Details

Using raw string literals like 'main' in inputs and outputs is fragile: the values are not type-checked, and typos or renamed connection types will go undetected. The NodeConnectionTypes object from n8n-workflow is the single source of truth and should always be used instead.

Examples

❌ Incorrect

  description: INodeTypeDescription = {
    displayName: 'My Node',
    name: 'myNode',
    inputs: ['main'],
    outputs: ['main'],
    properties: [],
  };
}

✅ Correct

  description: INodeTypeDescription = {
    displayName: 'My Node',
    name: 'myNode',
    inputs: [NodeConnectionTypes.Main],
    outputs: [NodeConnectionTypes.Main],
    properties: [],
  };
}