The built-in library 'dart:io' is not available on Dartium.

[coryrwest]

I have created a dart class using the dart_config package to load DB connection information from a file. When I run a unit test the code works, but when I run my web app and try to render something on the page using that object I get this error:

The built-in library 'dart:io' is not available on Dartium.

Again, this is while using the dart_config to load info from a file in a web application. The code works fine when running it from a unit test.