<template>
  <button v-if="deferredPrompt" @onClick="promptInstall">
    Add to home screen
  </button>
</template>

<script lang="ts">
  import { Component, Vue } from "vue-property-decorator";
  import { BeforeInstallPromptEvent } from "vue-pwa-install";

  @Component({})
  export default class App extends Vue {
    deferredPrompt: BeforeInstallPromptEvent | void;

    promptInstall() {
      // Show the prompt:
      this.deferredPrompt.prompt();

      // Wait for the user to respond to the prompt:
      this.deferredPrompt.userChoice.then((choiceResult) => {
        if (choiceResult.outcome === "accepted") {
          console.log("User accepted the install prompt");
        } else {
          console.log("User dismissed the install prompt");
        }

        this.deferredPrompt = null;
      });
    }

    created() {
      this.$on("canInstall", (event: BeforeInstallPromptEvent) => {
        // Prevent Chrome 67 and earlier from automatically showing the prompt:
        event.preventDefault();

        // Stash the event so it can be triggered later:
        this.deferredPrompt = event;
      });
    }
  }
</script>