The error for using dart:io is unhelpful

[devoncarew]

From @lukechurch on January 5, 2015 12:30

"Error compiling:
[500 Internal Server Error] [error, line 1] Library not found 'dart:io'."

Should be something along the lines of

"The dart:io library cannot be used in a browser context. Please see support page for common work arounds."

Lets chat about where we put in the fix.

Copied from original issue: devoncarew/dartpad_ui#14

[devoncarew]

It now reads:

There was an issue when compiling to JavaScript:
[error, line 1] Library not found 'dart:io'.

Which is an intermediate step towards the above solution.

[sethladd]

We should prevent the Run button from being clickable, if the code somehow imports dart:io.

[devoncarew]

The error has been cleaned up quite a bit. We can get some more info from the backend when analyzing, to be able to recognize a sample that directly or transitively imports dart:io.