Add node modules and compiled JavaScript from main (#172)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/browserslist/error.d.ts

@@ -0,0 +1,7 @@
+declare class BrowserslistError extends Error {
+  constructor(message: any);
+  name: 'BrowserslistError';
+  browserslist: true;
+}
+
+export = BrowserslistError;