@spectrum-web-components/base/src/define-element.dev.js

The `SpectrumElement` base class as created by mixing `SpectrumMixin` onto `LitElement` provides text direction support via the CSS `:dir()` pseudo-class, which automatically inherits directionality from the DOM hierarchy. In a TypeScript context, it also

"use strict";
export function defineElement(name, constructor) {
  if (window.__swc && true) {
    if (customElements.get(name)) {
      window.__swc.warn(
        void 0,
        `Attempted to redefine <${name}>. This usually indicates that multiple versions of the same web component were loaded onto a single page.`,
        "https://opensource.adobe.com/spectrum-web-components/registry-conflicts"
      );
    }
  }
  customElements.define(name, constructor);
}
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