chore: install cssbundling rails and set up compilation

spec/dummy/node_modules/unicorn-magic/index.d.ts

@@ -0,0 +1,29 @@
+/**
+Delay the promise for the given duration.
+
+@example
+```
+import {delay} from 'unicorn-magic';
+
+await delay({seconds: 1});
+
+console.log('1 second later');
+```
+*/
+export function delay(duration: {seconds: number} | {milliseconds: number}): Promise<void>;
+
+/**
+Convert a `URL` or path to a path.
+
+**Not available in browsers.**
+
+@example
+```
+import path from 'node:path';
+import {toPath} from 'unicorn-magic';
+
+// `cwd` can be `URL` or a path string.
+const getUnicornPath = cwd => path.join(toPath(cwd), 'unicorn');
+```
+*/
+export function toPath(urlOrPath: URL | string): string;