Monaco Editor test client

[vbar]

For testing the container (especially Language Server performance), if would be useful to wrap the Monaco Editor Language Client in a non-interactive, command-line test client, which would just open a source file and handle the initial LSP communication, IOW wrap

    <Editor
      className="hooks-editor"
      keepCurrentModel
      defaultLanguage={snap.files?.[snap.active]?.language}
      language={snap.files?.[snap.active]?.language}
      path={`file:///work/c/${snap.files?.[snap.active]?.name}`}
      defaultValue={snap.files?.[snap.active]?.content}
      beforeMount={monaco => {
        if (!snap.editorCtx) {
          snap.files.forEach(file =>
            monaco.editor.createModel(
              file.content,
              file.language,
              monaco.Uri.parse(`file:///work/c/${file.name}`)
            )
          );
        }

        // create the web socket
        if (!subscriptionRef.current) {
          monaco.languages.register({
            id: "c",
            extensions: [".c", ".h"],
            aliases: ["C", "c", "H", "h"],
            mimetypes: ["text/plain"],
          });
          MonacoServices.install(monaco);
          const webSocket = createWebSocket(
            process.env.NEXT_PUBLIC_LANGUAGE_SERVER_API_ENDPOINT || ""
          );
          subscriptionRef.current = webSocket;
          // listen when the web socket is opened
          listen({
            webSocket: webSocket as WebSocket,
            onConnection: connection => {
              // create and start the language client
              const languageClient = createLanguageClient(connection);
              const disposable = languageClient.start();
              connection.onClose(() => {
                try {
                  // disposable.stop();
                  disposable.dispose();
                } catch (err) {
                  console.log("err", err);
                }
              });
            },
          });
        }

in a standalone script, possibly using Jest (see https://medium.com/hired-engineering/setting-up-monaco-with-jest-e1e4c963ac ).