Vue: use `computed` without `data`

gistfile1.txt

computed: {
    shouldStorePwd: {
        get: function() {
            return (
                localStorage.getItem('shouldStorePwd') ? 
                localStorage.getItem('shouldStorePwd') : 
                true
            );                  
        },
        set: function(yesOrNo) {
            localStorage.setItem('shouldStorePwd', yesOrNo);                
        }            
    }
},