const commandHandler = () => { /* whatever */ };
const commandId0 = editor0.addCommand(0, commandHandler, "");
const commandId1 = editor1.addCommand(0, commandHandler, "");

export const codeLensProvider: monaco.languages.CodeLensProvider = {
    provideCodeLenses: (model, cancelToken) => ([
        {
            range: someRange,
            command: {
                id: "???" // which commandId should we use?
                title: "A Command",
                arguments: [],
            }
        }
    ])
};    
monaco.languages.registerCodeLensProvider("*", codeLensProvider);