How to add a local cordova plugin with ionic / ionic 2 / ionic 3 / ionic 4 / ionic 5?
To add a local plugin with ionic :
ionic cordova plugin add /path/to/my/plugin/my.plugin.folder.here/
to remove it :
ionic cordova plugin remove my.plugin.folder.here
But to update it it's another problem. Actually I'm removing and installing it again after each edit. Good luck ;)
EDIT
If you are using a previous version of ionic cli, and it doesn't work, change the commands to the following :
ionic plugin add /path/to/my/plugin/my.plugin.folder.here/
and
ionic plugin remove my.plugin.folder.here
If you are using plugman then
plugman install --platform android --project path/to/your/ionicapp/platforms/android --plugin /Path/to/your/cordova-plugin/MyDemo/
will install the plugin, read other options in project's readme.