Make a ViewPlugin configurable in CodeMirror

ViewPlugin.fromClass only allows the class constructor to take a single argument with the CodeMirror view.

You use a Facet. Great example in JupyterLab. Like everything in CodeMirror, this lets you be super flexible with how configuration works - it is designed with multiple reconfigurations in mind.

Example defining the facet:

export const suggestionConfigFacet = Facet.define<
  { acceptOnClick: boolean },
  { acceptOnClick: boolean }
>({
  combine(value) {
    return { acceptOnClick: !!value.at(-1)?.acceptOnClick };
  },
});

Initializing the facet:

suggestionConfigFacet.of({ acceptOnClick: true });

Reading the facet:

const config = view.state.facet(suggestionConfigFacet);