Google Closure compiler warning about changing a constant location

I'm getting this warning when using the library in a ClojureScript project (where all JS code is passed through the Google Closure Compiler):
```
Resource: node_modules/file-saver/dist/FileSaver.min.js:2:2315
constant location assigned a value more than once.
Original definition at externs.zip//window.js:52
```
Seems like it's this line in the unminified source: https://github.com/eligrey/FileSaver.js/blame/master/dist/FileSaver.js#L163

According to [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/API/Window/location), `window.location` is indeed read-only.