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// SSR safe client-side ID attribute generation // ID's can only be generated client-side, after mount // `this._uid` is not synched between server and client import { COMPONENT_UID_KEY, Vue } from '../vue'; import { PROP_TYPE_STRING } from '../constants/props'; import { makeProp } from '../utils/props'; // --- Props --- export var props = { id: makeProp(PROP_TYPE_STRING) }; // --- Mixin --- // @vue/component export var idMixin = Vue.extend({ props: props, data: function data() { return { localId_: null }; }, computed: { safeId: function safeId() { // Computed property that returns a dynamic function for creating the ID // Reacts to changes in both `.id` and `.localId_` and regenerates a new function var id = this.id || this.localId_; // We return a function that accepts an optional suffix string // So this computed prop looks and works like a method // but benefits from Vue's computed prop caching var fn = function fn(suffix) { if (!id) { return null; } suffix = String(suffix || '').replace(/\s+/g, '_'); return suffix ? id + '_' + suffix : id; }; return fn; } }, mounted: function mounted() { var _this = this; // `mounted()` only occurs client-side this.$nextTick(function () { // Update DOM with auto-generated ID after mount // to prevent SSR hydration errors _this.localId_ = "__BVID__".concat(_this[COMPONENT_UID_KEY]); }); } });