[TS] Suggest and validate names of plugins and commands at type level

[filipsobol]

Currently, TypeScript doesn't suggest names for available plugins and commands. It also doesn't check whether plugins or commands with the given name even exist.

Ideally, TypeScript should suggest names of registered plugins and commands, and show errors if we pass an invalid name.

[Reinmar]

What about editor.execute()? AFAIU the augmentation was supposed to ensure exactly that.

[filipsobol]

editor.execute() behaves exactly the same.

[niegowski]

This is working as expected. We did not want to force plugin developers to augment PluginsMap and CommandsMap so we added a fallback for not registered plugins and commands:

https://github.com/ckeditor/ckeditor5/blob/e40ee9cdef3ff420bb6454bf0e209c65e0bf187c/packages/ckeditor5-core/src/plugincollection.ts#L648-L650

https://github.com/ckeditor/ckeditor5/blob/e40ee9cdef3ff420bb6454bf0e209c65e0bf187c/packages/ckeditor5-core/src/commandcollection.ts#L133-L135

The progressive improvement with those maps is that if you specify a mapped command name then other parameters are validated:

Same for PluginsMap, it provides a plugin type for a specified plugin name:

[Witoso]

I guess the scope of this would be to include information in the docs on how to properly augment Plugins and Commands.

[CKEditorBot]

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[CKEditorBot]

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