Technically it's possible, the version that's very cross-platform because it relies on java is here:
https://www.npmjs.com/package/node-key-sender
otherwise you need to use native platform calls, so with node it would be:https://koffi.dev/ orhttps://www.npmjs.com/package/ffi

On the other hand, a very reasonable solution is to have a global shortcut (windows default clipboard manager uses meta+v to trigger the manager) that brings the helper window, and on selecting - just put the contents into the clipboard. This way you don't have to type the content on your own.

https://www.electronjs.org/docs/latest/api/clipboard
https://www.geeksforgeeks.org/clipboard-api-in-electronjs/

The window for selecting the snippet on global shortcut should be a frameless window
https://www.geeksforgeeks.org/frameless-window-in-electronjs/

I have a similar idea and I post it here instead of starting a new one :)

I would like to suggest a feature that enhances snippet insertion efficiency within massCode. The idea is to implement a text expander functionality triggered by a specific shortcut (e.g., §1).

Proposed Functionality:

Trigger: Typing a designated shortcut (e.g., §1) within the editor.

• Action: Upon detecting the shortcut, massCode would display a pop-up menu listing all snippets contained in a specific folder (e.g., folder 'X').
• Selection: Each snippet in the list would be associated with a number. Pressing the corresponding number key would insert the selected snippet into the editor at the cursor's position.

Benefits:

• Streamlines the process of inserting frequently used snippets.
• Reduces the need to navigate through folders manually.
• Enhances productivity by allowing quick access to organized snippets.

Considerations:

• The shortcut key (e.g., §1) should be customizable to avoid conflicts with existing keybindings.
• The feature should support different folders, allowing users to define shortcuts for various snippet categories.
• Implementing a preview of the snippet content in the pop-up could further aid in selection.

I believe this feature would significantly improve the user experience for those who rely heavily on organized snippets.