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This file describes the format of the `problemsAsJson` strings in Dart Kernel.

Each string in the list is a json object consisting of these keys and values:

`ansiFormatted`: A list of strings the contain ansi formatted (for instance with
colors) problem-texts as reported by the compiler.

`plainTextFormatted`: A list of strings that contain formatted plaintext
problem-texts as reported by the compiler.

`severity`: An integer representing severity. This should match the index in
`package:_fe_analyzer_shared/src/messages/severity.dart`.

`uri`: A possibly null uri that this problems relates to. This is the main uri.
Normally this is not null (but it can be).

`involvedFiles`: A possibly null list of uris involved in this message.
Normally this is null.

`codeName`: A string identifing the specific error message.

These values are subject to change, but this file will be updated along with any
such changes. On the code-side these are defined in
`package:front_end/src/fasta/fasta_codes.dart`.