@spectrum-web-components/shared/src/observe-slot-presence.js

Shared mixins, tools, etc. that support developing Spectrum Web Components.

"use strict";import{MutationController as u}from"@lit-labs/observers/mutation-controller.js";const t=Symbol("slotContentIsPresent");export function ObserveSlotPresence(l,s){var o,i;const r=Array.isArray(s)?s:[s];class a extends(i=l,o=t,i){constructor(...e){super(e);this[o]=new Map;this.managePresenceObservedSlot=()=>{let e=!1;r.forEach(n=>{const c=!!this.querySelector(`:scope > ${n}`),g=this[t].get(n)||!1;e=e||g!==c,this[t].set(n,!!this.querySelector(`:scope > ${n}`))}),e&&this.updateComplete.then(()=>{this.requestUpdate()})};new u(this,{config:{childList:!0,subtree:!0},callback:()=>{this.managePresenceObservedSlot()}}),this.managePresenceObservedSlot()}get slotContentIsPresent(){if(r.length===1)return this[t].get(r[0])||!1;throw new Error("Multiple selectors provided to `ObserveSlotPresence` use `getSlotContentPresence(selector: string)` instead.")}getSlotContentPresence(e){if(this[t].has(e))return this[t].get(e)||!1;throw new Error(`The provided selector \`${e}\` is not being observed.`)}}return a}
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