Typeahead and Laravel not returning any results

I am trying to setup Typeahead.js, to use as an autosuggestion feature on my Laravel app. Unfortunately, it returns no results, each time.

I return the data beforehand to take advantage of local storage, so there is no querying the DB in my instance.

Route:

Route::get('/', function () {
    return view('welcome', ['treatments' => Treatment::orderBy('treatment')
        ->pluck('treatment', 'id')]);
});

Welcome view:

const treatments = new Bloodhound({
    datumTokenizer: Bloodhound.tokenizers.whitespace,
    queryTokenizer: Bloodhound.tokenizers.whitespace,
    local: ''
  });

  $('#bloodhound').typeahead({
      hint: true,
      highlight: true,
      minLength: 1
    },
    {
      name: 'treatments',
      source: treatments,

      templates: {
        empty: [
          '<div class="list-group search-results-dropdown"><div class="list-group-item">Nothing found.</div></div>'
        ],
        header: [
          '<div class="list-group search-results-dropdown">'
        ]

      }
    }).on('typeahead:selected', function (evt, item) {
    $('#bloodhound').text(item.id);
  });

Input field:

<input type="search" name="treatment" id="bloodhound" class="form-control" 
        placeholder="Find a treatment" autocomplete="off" required>

Output of $treatments array:

local: '{"2":"Treatment 1"}'

The last section of the script, should enter the value of the selection (ID ) within the input field, but unfortunately that doesn't work either.

Many thanks.

via Chebli Mohamed