Fixing named prop "_lat" (#238)

* Fixing named prop "_lat"

* Adding comment to regex

Author: jshcrowthe

packages/firebase/webpack.config.js

@@ -40,7 +40,21 @@ const baseConfig = {
       mangle: {
         props: {
           ignore_quoted: true,
-          regex: /^_[^_]|[^_]_$/
+          /**
+           * This regex will trigger minification of subproperties that match
+           * any of the following use cases:
+           * 
+           * - Prefixed with an underscore (i.e. _)
+           * - Suffixed with an underscore (i.e. _)
+           * 
+           * Exceptions:
+           * - Double underscore prefix/suffix (we have some props that rely on
+           * this naming convention)
+           * - `_lat` (we have a property in auth that depends on this name)
+           * 
+           * This will be kept up to date as this changes
+           */
+          regex: /^_[^_][^lat]|[^_]_$/
         }
       },
       compress: {