Windy uses Leaflet version 1.4.0 that is well documented here and contains plenty of plugins that you can use.

This is main configuration file for your plugin.

hook contains the identifier of the place, where opening link to your plugin will appear. So far only 'contextmenu' and 'menu' is supported.

displayName contains name of your plugin, as it will appear in the menu.

But the most important config variable is name of your plugin, which is name property defined in your package.json, since the name of your plugin must be same as the name of your npm package.

The name of your plugin, and your npm package must have form windy-plugin-anyName.

This plugin does not have any HTML content, nor CSS. Windy API modules are imported with import { map } from '@windy/map'

export const onopen => {} method is called when your plugin is being opened.

Remember, that ononpen method can be called repeatedly (without your plugin being closed before), so make sure, that you will not to subscribe to any listener twice. On the other hand onmount is called just once.

export const ondestroy => {} method is called when your plugin is being closed. Unsubscribe from all your listeners, and remove all your stuff from a map.

See Windy Plugins API to have better idea how plugin system works or Windy API documentation