How to use the xterm/lib/addons/search/search.findNext function in xterm

search(incremental: boolean, searchDirection: 'next' | 'previous'): void {
        if (this.searchInput) {
            this.searchOptions.incremental = incremental;
            const searchText = this.searchInput.value;

            if (searchDirection === 'next') {
                findNext(this.terminal, searchText, this.searchOptions);
            }

            if (searchDirection === 'previous') {
                findPrevious(this.terminal, searchText, this.searchOptions);
            }
        }
    }

protected findNext(incremental?: boolean): void {
        if (this.searchInput) {
            const text = this.searchInput.value;
            findNext(this.terminal, text, {...this.searcOptions, incremental});
        }
    }