chore: import upstream snapshot with attribution

tools/client-plugins/browser-scripts/sass-compile.ts

@@ -0,0 +1,40 @@
+import { version } from '@freecodecamp/browser-scripts/package.json';
+// work around for SASS error in Edge
+// https://github.com/medialize/sass.js/issues/96#issuecomment-424386171
+interface WorkerWithSass extends Worker {
+  Sass: {
+    compile(data: unknown, callback: unknown): void;
+  };
+}
+
+const ctx: WorkerWithSass & typeof globalThis =
+  self as unknown as WorkerWithSass & typeof globalThis;
+
+if (!ctx.crypto) {
+  (ctx.crypto as unknown) = {
+    getRandomValues: function (array: number[]) {
+      for (let i = 0, l = array.length; i < l; i++) {
+        array[i] = Math.floor(Math.random() * 256);
+      }
+      return array;
+    }
+  };
+}
+
+ctx.importScripts(`/js/workers/${version}/sass.sync.js`);
+
+ctx.onmessage = e => {
+  const data: unknown = e.data;
+  ctx.Sass.compile(data, (result: Record<string, unknown>) => {
+    if (result.status === 0) {
+      ctx.postMessage(result.text);
+    } else {
+      ctx.postMessage({
+        type: 'error',
+        data: { message: result.formatted }
+      });
+    }
+  });
+};
+
+ctx.postMessage({ type: 'contentLoaded' });