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name : DirtyState.js
 import Vue from 'vue'

const vm = new Vue({

    data: {
        names: []
    },

    watch: {

        names(names) {
            if (names.length) {
                this.enableWarning();
            }

            if (names.length === 0) {
                this.disableWarning();
            }
        }

    },

    methods: {

        add(name) {
            if (this.names.indexOf(name) == -1) {
                this.names.push(name);
            }
        },

        remove(name) {
            this.names = this.names.filter(n => n !== name);
        },

        enableWarning() {
            if (Statamic.$preferences.get('confirm_dirty_navigation', true)) {
                window.onbeforeunload = () => '';
            }
        },

        disableWarning() {
            window.onbeforeunload = null;
        }

    }

});

class DirtyState {
    state(name, state) {
        state ? this.add(name) : this.remove(name);
    }
    add(name) {
        vm.add(name);
    }
    remove(name) {
        vm.remove(name);
    }
    names() {
        return vm.names;
    }
    count() {
        return vm.names.length;
    }
    has(name) {
        return vm.names.includes(name);
    }
    disableWarning() {
        vm.disableWarning();
    }
}

Object.defineProperties(Vue.prototype, {
    $dirty: {
        get() {
            return new DirtyState;
        }
    }
});
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