how to have accessible variables in component methods

I'm working on a component that takes care of registering my users to Sinch (voip platform). In order for my registration to work I need to have some variables that are accessible throughout my component methods. I'm wondering how this should be done using vue.

I need my variable sinchClient to be accessible in my methods newUserRequest() and loginRequest()

Any tips?

Sinch variable

var sinchClient = new SinchClient({
  applicationKey: "My-Key",
  capabilities: {
    messaging: true,
    calling: true
  },
  supportActiveConnection: true,
  onLogMessage: function(msg) {
    console.log(msg);
  }
});

Methods

<script>
export default {
  data() {
    return {
      username: null,
      name: null,
      password: null,
      loggedIn: false
    };
  },
  mounted() {},
  methods: {
    newUserRequest() {
      console.log(this.name, this.password);

      if (this.name && this.password) {
        var handleSuccess = () => {
          console.log("User created");
          this.loggedIn = true;
          this.name = sinchClient.user.userId;
        };
        var handleFail = error => {
          console.log(error.message);
        };

        var signUpObject = { username: this.name, password: this.password };
        sinchClient
          .newUser(signUpObject)
          .then(sinchClient.start.bind(sinchClient))
          .then(() => {
            localStorage[
              "sinchSession-" + sinchClient.applicationKey
            ] = JSON.stringify(sinchClient.getSession());
          })
          .then(handleSuccess)
          .fail(handleFail);
      }
    },
    logInRequest() {
      if (this.name && this.password) {
        var handleSuccess = () => {
          console.log("User logged in");
          this.loggedIn = true;
          this.name = sinchClient.user.userId;
        };
        var handleFail = error => {
          console.log(error.message);
        };
        var signUpObject = { username: this.name, password: this.password };
        sinchClient
          .start(signUpObject)
          .then(() => {
            localStorage[
              "sinchSession-" + sinchClient.applicationKey
            ] = JSON.stringify(sinchClient.getSession());
          })
          .then(handleSuccess)
          .fail(handleFail);
      }
    }
  }
};
</script>

You can define sinchClient globally and access it using window (window.sinchClient). Better you can create a Vue plugin and inject it in the app context:

var sinchClient = new SinchClient({
  applicationKey: "My-Key",
  capabilities: {
    messaging: true,
    calling: true
  },
  supportActiveConnection: true,
  onLogMessage: function(msg) {
    console.log(msg);
  }
})
Vue.use({
  install: function(Vue) {
    Object.defineProperty(Vue.prototype, '$sinchClient', {
      get () { return sinchClient }
    })
  }
})

And access it with this.$sinchClientin Vue context