add initial marp implementation with sample content and build configuration

node_modules/@csstools/postcss-is-pseudo-class/dist/index.d.ts

@@ -0,0 +1,27 @@
+import type { PluginCreator } from 'postcss';
+
+declare const creator: PluginCreator<pluginOptions>;
+export default creator;
+
+/** postcss-is-pseudo-class plugin options */
+export declare type pluginOptions = {
+    /** Preserve the original notation. default: false */
+    preserve?: boolean;
+    /**
+     * Warn on complex selectors in `:is` pseudo class functions.
+     * default: _not set_
+     */
+    onComplexSelector?: 'warning';
+    /**
+     * Warn when pseudo elements are used in `:is` pseudo class functions.
+     * default: _not set_
+     */
+    onPseudoElement?: 'warning';
+    /**
+     * Change the selector used to adjust specificity.
+     * default: `does-not-exist`.
+     */
+    specificityMatchingName?: string;
+};
+
+export { }