Remove unused import

build.sh

elm-make Spelling.elm --output=spelling.js

index.html

<div id="spelling"></div>
<script src="spelling.js"></script>
<script>
    var app = Elm.Spelling.fullscreen();

    app.ports.check.subscribe(function(word) {
      var suggestions = spellCheck(word);
      app.ports.suggestions.send(suggestions);
    });

    fruits = []

    function spellCheck(word) {
      // You can check on the js console if fruits was updated by elm
      // typing fruits
      fruits.push(word);
      return fruits;
    }
</script>

Spelling.elm

port module Spelling exposing (..)

import Html exposing (..)
import Html.Events exposing (..)
import String


main =
    program
        { init = init
        , view = view
        , update = update
        , subscriptions = subscriptions
        }



-- MODEL


type alias Model =
    { word : String
    , suggestions : List String
    }


init : ( Model, Cmd Msg )
init =
    ( Model "" [], Cmd.none )



-- UPDATE


type Msg
    = Change String
    | Check
    | Suggest (List String)


port check : String -> Cmd msg


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        Change newWord ->
            ( Model newWord [], Cmd.none )

        Check ->
            ( model, check model.word )

        Suggest newSuggestions ->
            ( Model model.word newSuggestions, Cmd.none )



-- SUBSCRIPTIONS


port suggestions : (List String -> msg) -> Sub msg


subscriptions : Model -> Sub Msg
subscriptions model =
    suggestions Suggest



-- VIEW


view : Model -> Html Msg
view model =
    div []
        [ input [ onInput Change ] []
        , button [ onClick Check ] [ text "Check" ]
        , div [] [ text (String.join ", " model.suggestions) ]
        ]

@Kennedy-s You need to change:
port suggestions : (List String -> msg) -> Sub Msg
to
port suggestions : (List String -> msg) -> Sub msg

@fdbeirao thanks 👍 fixed