shidatonglin

I fixed the errors you guys mentioned above, but met another errors ERROR in [at-loader] ./node_modules/[email protected]@rxjs/Subject.d.ts:16:22 TS2415: Class 'Subject' incorrectly extends base class 'Observable'. Types of property 'lift' are incompatible....

I have fixed it by following https://stackoverflow.com/questions/44810195/how-do-i-get-around-this-subject-incorrectly-extends-observable-error-in-types