message: docs: move JsonParser class above CustomJsonInterceptor
  This move fixes the error in StackBlitz of
  Cannot access 'JsonParser' before initialization
  PR Close
diff: @@ -3,6 +3,12 @@ import { Injectable } from '@angular/core';
  import { map } from 'rxjs/operators';
  // #docregion custom-json-interceptor
  +// The JsonParser class acts as a base class for custom parsers and as the DI token.
  +@Injectable()
  +export abstract class JsonParser {
  + abstract parse(text: string): any;
  +}
  +
  @Injectable()
  export class CustomJsonInterceptor implements HttpInterceptor {
  constructor(private jsonParser: JsonParser) {}
  @@ -31,12 +37,6 @@ export class CustomJsonInterceptor implements HttpInterceptor {
  }
  }
  }
  -
  -// The JsonParser class acts as a base class for custom parsers and as the DI token.
  -@Injectable()
  -export abstract class JsonParser {
  - abstract parse(text: string): any;
  -}
  // #enddocregion custom-json-interceptor
  // #docregion custom-json-parser
  