@sandlada/mdc/build/node_modules/lit-html/directives/class-map.js

@sandlada/mdc is an open source component library that follows the Material Design 3 design specifications.

import{noChange as e}from"../lit-html.js";import{Directive as t,PartType as n,directive as r}from"../directive.js";
/**
* @license
* Copyright 2018 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/const i=r(class extends t{constructor(e){if(super(e),e.type!==n.ATTRIBUTE||e.name!==`class`||e.strings?.length>2)throw Error("`classMap()` can only be used in the `class` attribute and must be the only part in the attribute.")}render(e){return` `+Object.keys(e).filter((t=>e[t])).join(` `)+` `}update(t,[n]){if(this.st===void 0){this.st=new Set,t.strings!==void 0&&(this.nt=new Set(t.strings.join(` `).split(/\s/).filter((e=>e!==``))));for(let e in n)n[e]&&!this.nt?.has(e)&&this.st.add(e);return this.render(n)}let r=t.element.classList;for(let e of this.st)e in n||(r.remove(e),this.st.delete(e));for(let e in n){let t=!!n[e];t===this.st.has(e)||this.nt?.has(e)||(t?(r.add(e),this.st.add(e)):(r.remove(e),this.st.delete(e)))}return e}});export{i as classMap};
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