Fix dependencies: Add flag-icons, tailwind directives, and postcss config

node_modules/regex/dist/esm/subclass.d.ts

@@ -0,0 +1,31 @@
+/**
+Works the same as JavaScript's native `RegExp` constructor in all contexts, but automatically
+adjusts subpattern matches and indices (with flag `d`) to account for captures added as part of
+emulating extended syntax.
+*/
+export class RegExpSubclass extends RegExp {
+    /**
+     @overload
+     @param {string} expression
+     @param {string} [flags]
+     @param {{
+     hiddenCaptures?: Array<number>;
+     }} [options]
+     */
+    constructor(expression: string, flags?: string, options?: {
+        hiddenCaptures?: Array<number>;
+    });
+    /**
+     @overload
+     @param {RegExpSubclass} expression
+     @param {string} [flags]
+     */
+    constructor(expression: RegExpSubclass, flags?: string);
+    /**
+    @private
+    @type {Map<number, {
+      hidden: true;
+    }>}
+    */
+    private _captureMap;
+}