How to use pipe in ts not HTML

First import your pipe in component. And then use your pipe in your component. Like this..

pipe.ts

/**
 * filter checkbox list
 */
@Pipe({ name: 'filter', pure: true })
export class FilterPipe{
  transform(items: any[], args: any): any {
    let filter = args.toString();
    if(filter !== undefined && filter.length !== null){
        if(filter.length === 0 || items.length ===0){
            return items;
        }else{
            return filter ? items.filter(item=> item.title.toLocaleLowerCase().indexOf(filter) != -1) : items;
        }
    }
  }
}

component.ts (Use in your typescript code)

const filterPipe = new FilterPipe();
const fiteredArr = filterPipe.transform(chkArray,txtSearch);

xyz.html (Use in your html file)

<ul>
    <li *ngFor="todo for todos | filter:'txtsearch'"> {{todo.name}} </li>
</ul>