rxjs/Subject.d.ts error : Class 'Subject' incorrectly extends base class 'Observable'

Question

I extracted sample template code from this tutorial and did below two steps to get started -

1. npm install // worked fine and created node_modules folder

Answer 1

You can temporarily use the --noStrictGenericChecks flag to get around this in TypeScript 2.4.

This is --noStrictGenericChecks on the command line, or just "noStrictGenericChecks": true in the "compilerOptions" field in tsconfig.json.

Keep in mind, RxJS 6 will have this corrected.

See this similar question: How do I get around this error in RxJS 5.x in TypeScript 2.4?