How to use the @yarnpkg/plugin-npm.npmConfigUtils.getDefaultRegistry function in @yarnpkg/plugin-npm

// @ts-ignore
    const prompt = inquirer.createPromptModule({
      input: this.context.stdin,
      output: this.context.stdout,
    });

    let registry: string;
    if (this.scope && this.publish)
      registry = npmConfigUtils.getScopeRegistry(this.scope, {configuration, type: npmConfigUtils.RegistryType.PUBLISH_REGISTRY});
    else if (this.scope)
      registry = npmConfigUtils.getScopeRegistry(this.scope, {configuration});
    else if (this.publish)
      registry = npmConfigUtils.getPublishRegistry((await openWorkspace(configuration, this.context.cwd)).manifest, {configuration});
    else
      registry = npmConfigUtils.getDefaultRegistry({configuration});

    const report = await StreamReport.start({
      configuration,
      stdout: this.context.stdout,
    }, async report => {
      const credentials = await getCredentials(prompt);
      const url = `/-/user/org.couchdb.user:${encodeURIComponent(credentials.name)}`;

      try {
        const response = await npmHttpUtils.put(url, credentials, {
          configuration,
          registry,
          json: true,
          authType: npmHttpUtils.AuthType.NO_AUTH,
        });

async execute() {
    const configuration = await Configuration.find(this.context.cwd, this.context.plugins);

    let registry: string;
    if (this.scope && this.publish)
      registry = npmConfigUtils.getScopeRegistry(this.scope, {configuration, type: npmConfigUtils.RegistryType.PUBLISH_REGISTRY});
    else if (this.scope)
      registry = npmConfigUtils.getScopeRegistry(this.scope, {configuration});
    else if (this.publish)
      registry = npmConfigUtils.getPublishRegistry((await openWorkspace(configuration, this.context.cwd)).manifest, {configuration});
    else
      registry = npmConfigUtils.getDefaultRegistry({configuration});

    const report = await StreamReport.start({
      configuration,
      stdout: this.context.stdout,
    }, async report => {
      try {
        const response = await npmHttpUtils.get(`/-/whoami`, {
          configuration,
          registry,
          authType: npmHttpUtils.AuthType.ALWAYS_AUTH,
          json: true,
        });

        report.reportInfo(MessageName.UNNAMED, response.username);
      } catch (err) {
        if (err.name !== `HTTPError`) {