text: /* */ 
  "format cjs";
  import { Subscriber } from '../Subscriber';
  import { tryCatch } from '../util/tryCatch';
  import { errorObject } from '../util/errorObject';
  export function distinctUntilChanged(compare, keySelector) {
      return (source) => source.lift(new DistinctUntilChangedOperator(compare, keySelector));
  }
  class DistinctUntilChangedOperator {
      constructor(compare, keySelector) {
          this.compare = compare;
          this.keySelector = keySelector;
      }
      call(subscriber, source) {
          return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));
      }
  }
  class DistinctUntilChangedSubscriber extends Subscriber {
      constructor(destination, compare, keySelector) {
          super(destination);
          this.keySelector = keySelector;
          this.hasKey = false;
          if (typeof compare === 'function') {
              this.compare = compare;
          }
      }
      compare(x, y) {
          return x === y;
      }
      _next(value) {
          const keySelector = this.keySelector;
          let key = value;
          if (keySelector) {
              key = tryCatch(this.keySelector)(value);
              if (key === errorObject) {
                  return this.destination.error(errorObject.e);
              }
          }
          let result = false;
          if (this.hasKey) {
              result = tryCatch(this.compare)(this.key, key);
              if (result === errorObject) {
                  return this.destination.error(errorObject.e);
              }
          }
          else {
              this.hasKey = true;
          }
          if (Boolean(result) === false) {
              this.key = key;
              this.destination.next(value);
          }
      }
  }
  //# sourceMappingURL=distinctUntilChanged.js.map