How can I enable auto-completion for external packages like lodash in n8n's Code Node?

The issue you’re encountering is that the Code node’s editor currently only provides auto-completion (and type suggestions) for a predefined set of built‐in modules and n8n’s own helper functions. When you require a third‑party package like lodash:

JSCopied
const _ = require('lodash');

the editor doesn’t find corresponding type declarations because lodash isn’t included in the list of modules for which auto‑completion is enabled.

In n8n’s source, the Code node editor’s built‑in auto-completion is configured with an explicit list of modules (for example, in the constants file for the editor). This list does not include external libraries like lodash. At the moment there isn’t an officially supported way to extend this list dynamically with external type definitions so that they are picked up by the Code node editor.

To summarize:

• Auto‑completion for core utilities works because those modules are registered internally.
• Third‑party packages (like lodash) aren’t part of the built‑in auto‑completion list, leading to the warning:
  “Cannot find module 'lodash' or its corresponding type declarations.”
• Currently, you can still use lodash in your code node—the warning only affects editor suggestions, not the actual execution.
• If you need richer auto‑completion for external libraries, you might have to rely on your local development setup with a full-featured editor (e.g., VS Code) that can leverage its own TypeScript integrations and type declaration files.

Until n8n adds support for loading external type declarations in the Code node’s editor, this remains a limitation of the current implementation.