SignIn2.vue

// src/views/SignIn.vue
<script>
import {signIn} from '@/utils/auth.js'  // Adding this line
export default {
  name: "SignIn",
...
  methods: {
    submit() {
      if (this.$refs.form.validate()) {
        console.log(`SIGN IN username: ${this.username}, password: ${this.password}`);
        signIn(this.username, this.password);  // Adding this line as well
      }
    },
  },
}
</script>