message property
The error message.
If no context.reportLocation is provided, the message must contain a
header (typically consisting of the exception type name and an error
message) and an exception stack trace in one of the supported programming
languages and formats. Supported languages are Java, Python, JavaScript,
Ruby, C#, PHP, and Go. Supported stack trace formats are: * Java: Must
be the return value of
[Throwable.printStackTrace()](https://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html#printStackTrace%28%29).
- Python: Must be the return value of
[
traceback.format_exc()](https://docs.python.org/2/library/traceback.html#traceback.format_exc). - JavaScript: Must be the value of
[
error.stack](https://github.com/v8/v8/wiki/Stack-Trace-API) as returned by V8. * Ruby: Must contain frames returned by [Exception.backtrace](https://ruby-doc.org/core-2.2.0/Exception.html#method-i-backtrace). - C#: Must be the return value of
[
Exception.ToString()](https://msdn.microsoft.com/en-us/library/system.exception.tostring.aspx). - PHP: Must start with
PHP (Notice|Parse error|Fatal error|Warning)and contain the result of [(string)$exception](http://php.net/manual/en/exception.tostring.php). - Go: Must be the return value of
[
runtime.Stack()](https://golang.org/pkg/runtime/debug/#Stack).
Required.
Implementation
core.String? message;