VueJS v2 - v-model input default value

vsetvalue.js

export default {
    install(Vue, options) {

        Vue.directive('set-value', {
            bind (el, binding, vnode, oldVnode) {
                var model = vnode.data.directives.find(dir => dir.rawName === 'v-model');
                if (!model || !model.expression) {
                    console.error('[vue-set-value warn] The element does not have v-model');
                    return;
                }
                vnode.context[model.expression] = binding.value;
            }
        })

    }
}