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@iqitlab You probably use strict type checking in the tsconfig, which requires all types to be defined and all variables initialized. Please try to update the TS code to:

  searchText = new Subject<string>();
  results: Observable<string[]>;
  data: any = [
    'red',
    'green',
    'blue',
    'cyan',
    'magenta',
    'yellow',
    'black',
  ];

  constructor() {
    this.results = this.searchText.pipe(
      startWith(''),
      map((value: string) => this.filter(value))
    );
  }

  filter(value: string): string[] {
    const filterValue = value.toLowerCase();
    return this.data.filter((item: string) => item.toLowerCase().includes(filterValue));
  }