Using the following code for updating the ReportSource of the viewer:

ngOnInit() {
  this.setParameters();
}

setParameters(): void {
  this.reportViewer.setReportSource({
    report: 'SampleReport.trdp',
    parameters: {}
  });
}

comes up with the error 

Argument of type '{ report: string; }' is not assignable to parameter of type 'JSON'.
  Type '{ report: string; }' is missing the following properties from type 'JSON': parse, stringify, [Symbol.toStringTag]

Currently, the workaround is to cast the reportSource object as follows:

When a report contains data item bound to big amount of data, it takes time to export in CSV format due to data denormalization.
This would be a performance improvement for big data reports. 

When trying to set the 'parametersAreaVisible' option in the Angular viewer the application breaks with an error in the browser console:

"Can't bind to 'parametersAreaVisible' since it isn't a known property of 'tr-viewer'."

With reference to support ticket 992325 where the behaviour of making minute changes to the measurements of grid columns occurs inadvertently I would like to suggest that this is changed and does not happen, i.e. improve the handling of floating point numbers in the serialization/deserialization process.  It causes noise in the source control history of the file.  Note that this behaviour is not apparent with comparable reporting solutions, e.g. SSRS/RDLC files.

As a developer integrating a Web-based report viewer into my apllication / Report Server implementer,

I would like to provide BCC field as part of the Send email functionality ( https://docs.telerik.com/reporting/html5-report-viewer-send-mail )

So that my end users have more flexible UX.

The expression parser throws an exception when parsing an expression that calls .ToString() method after closing parenthesis like the one below:

=(Fields.Value1+Fields.Value2).ToString()

If the two operands in parentheses are converted to double, the expression is parsed and evaluated correctly:

=CDbl(Fields.Value1+Fields.Value2).ToString()

There is the newly introduced WebServiceDataSource which enables me to get JSON data from a web service. I'd like to be able to use JSON as a data source for a report without using a web service. For example, the JSON might be embedded inside the report definition, or it might be coming from an external text file (URI or URL), or even pass it programmatically to the report at run-time.

Add support for PDF Accessibility as described in the https://www.adobe.com/accessibility/pdf/pdf-accessibility-overview.html