I encountered an error that says:
**Build:Class 'Subject<T>' incorrectly extends base class 'Observable<T>** .
I have TypeScript 2.4.1 installed and obtained angular quick starter files from the GitHub repository angular quick starter files. I then copied the src folder, bs-config.json, package.json, tslint.json files to my project (an empty template project in ASP.NET MVC). Upon rebuilding the project, this error occurred. Any suggestions on how to resolve it?
To solve the issue, I decided to remove TypeScript through the control panel and reinstall it using NuGet. This seemed to do the trick as now everything is functioning properly.
PM => Install-Package Microsoft.TypeScript.Compiler -Version 2.1.5
The issue was resolved in the latest version of RxJS, but you must ensure that it is compiled with TypeScript 2.4. To make this change, open the .csproj file in a text editor and locate the following tag:
<typescripttoolsversion>1.8</typescripttoolsversion>
Update the version number to 2.4 and recompile the code.
<typescripttoolsversion>2.4</typescripttoolsversion>
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