Botyglot Components V0.0.1

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<!DOCTYPE html>
<html>
  <head>
    <title>Demo</title>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <meta name="csrf-param" content="authenticity_token" />
    <meta name="csrf-token" content="fHjJVOM5y49mm44hzBtpNXj01qthNl4iW7txP70hnkOepgKqjcZ95enWX30IH3s1rEDZjPGw6f3RuMAjlDddpA" />
    <!-- ATTENTION: The following line is required for Turbo dialog works see: https://github.com/hotwired/turbo/issues/1191#issuecomment-1952959217 -->
    <meta name="turbo-prefetch" content="false">
    <link rel="stylesheet" href="/assets/tailwind-b07d8146.css" data-turbo-track="reload" />
    <link rel="stylesheet" href="/assets/elevate-9611e0ae.css" />
    <script src="/vite/assets/application-Dhu5wEut.js" crossorigin="anonymous" type="module"></script><link rel="modulepreload" href="/vite/assets/monaco-editor-C1G6nEm4.js" as="script" crossorigin="anonymous"><link rel="stylesheet" href="/vite/assets/monaco-editor-DQmwQvws.css" media="screen" />
  </head>
  <body>
    <div id="elevate-toast-host" data-controller="toast" data-turbo-permanent="true" data-toast-position-value="top-center" data-toast-layout-value="default" data-toast-auto-dismiss-duration-value="4000" data-toast-limit-value="3" data-toast-gap-value="14" class="elevate-toast elevate-toast--position--top-center">
      <ol data-toast-target="container" class="relative flex flex-col-reverse sm:flex-col gap-0 pointer-events-auto [&>li]:pointer-events-auto" style="height: 0px;"></ol>
      <div data-toast-target="livePolite" role="status" aria-live="polite" aria-atomic="true" class="sr-only"></div>
      <div data-toast-target="liveAssertive" role="alert" aria-live="assertive" aria-atomic="true" class="sr-only"></div>
      <template data-toast-template data-toast-type="default">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--default"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <circle cx="9" cy="9" r="7.4"></circle>
                    <circle cx="9" cy="9" r="1.4" fill="currentColor" stroke="none"></circle>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="success">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--success"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <circle cx="9" cy="9" r="7.4"></circle>
                    <path d="M5.6 9.2 L8 11.6 L12.4 6.8"></path>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="error">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--error"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <circle cx="9" cy="9" r="7.4"></circle>
                    <path d="M6.2 6.2 L11.8 11.8 M11.8 6.2 L6.2 11.8"></path>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="info">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--info"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <circle cx="9" cy="9" r="7.4"></circle>
                    <path d="M9 8 L9 12.4"></path>
                    <circle cx="9" cy="5.6" r="0.5" fill="currentColor" stroke="none"></circle>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="warning">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--warning"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <path d="M9 2.4 L16.2 14.6 L1.8 14.6 Z"></path>
                    <path d="M9 7.2 L9 10.6"></path>
                    <circle cx="9" cy="12.6" r="0.5" fill="currentColor" stroke="none"></circle>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="danger">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--danger"
        aria-hidden="true">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" focusable="false" aria-hidden="true">
                    <path d="M9 1.8 L15.6 5.4 L15.6 10 C15.6 13.4 12.6 15.6 9 16.6 C5.4 15.6 2.4 13.4 2.4 10 L2.4 5.4 Z"></path>
                    <path d="M9 6.4 L9 10"></path>
                    <circle cx="9" cy="12" r="0.5" fill="currentColor" stroke="none"></circle>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template data-toast-type="loading">
        <li class="toast-item">
          <div class="elevate-toast--content">
            <div class="elevate-toast--row">
              <div class="elevate-toast--plate elevate-toast--plate--loading"
        role="progressbar" aria-label="Loading…">
                <span class="elevate-toast--plate-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 18 18" fill="none" focusable="false" aria-hidden="true">
                    <circle cx="9" cy="9" r="7" stroke="currentColor" stroke-opacity="0.2" stroke-width="1.6"></circle>
                    <path d="M9 2 A7 7 0 0 1 16 9" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"></path>
                  </svg>
                </span>
              </div>
              <div class="elevate-toast--text">
                <p class="elevate-toast--title" data-toast-slot="message"></p>
                <p class="elevate-toast--description" data-toast-slot="description"></p>
              </div>
              <button type="button" class="elevate-toast--close" data-toast-slot="close" aria-label="Close">
                <span class="elevate-toast--close-icon elevate-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                    <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                  </svg>
                </span>
              </button>
            </div>
          </div>
        </li>
      </template>
      <template data-toast-template-rich>
        <li class="toast-item">
          <div class="elevate-toast--content elevate-toast--content--rich">
            <div data-toast-slot="content"></div>
            <button type="button" class="elevate-toast--close elevate-toast--close--floating" data-toast-slot="close" aria-label="Close"><span class="elevate-toast--close-icon elevate-icon">
                <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewbox="0 0 14 14" fill="none" focusable="false" aria-hidden="true">
                  <path d="M3.5 3.5 L10.5 10.5 M10.5 3.5 L3.5 10.5" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"></path>
                </svg>
              </span></button></div>
        </li>
      </template>
    </div>
    <main class="container mx-auto mt-12 px-5">
      <form data-controller="elevate-hotwire" data-elevate-hotwire-values-value="{"elevate_lookbook_user":{"id":null,"first_name":null,"last_name":"Doe","phone":null,"email":null,"amount":null,"website":null,"country":null,"birth_date":null,"appointment_at":null,"code_snippet":null,"bio":null,"preferred_time":null,"newsletter":false,"marketing_emails":null,"terms_accepted":false,"privacy_policy_accepted":false,"interests":null,"notification_preferences":[],"errors":{"_is_valid":true},"warnings":{"_is_valid":true},"suggested_values":{"first_name":"Oscar Botyglot","country":"france","birth_date":"2026-08-25","appointment_at":"2026-05-18T08:00:00.000Z","code_snippet":"# Sample Ruby code\nclass HelloWorld\n  def greet(name)\n    puts \"Hello, #{name}!\"\n  end\nend\n\nhello = HelloWorld.new\nhello.greet(\"World\")\n","phone":"+33 1 23 45 67 89","amount":1234.56,"bio":"Passionate software developer with expertise in Ruby on Rails and Vue.js. Always eager to learn new technologies and share knowledge with the community.","preferred_time":"2026-08-25T14:30:00.000Z","newsletter":true,"marketing_emails":true,"terms_accepted":true,"privacy_policy_accepted":true,"interests":["ruby","javascript"],"notification_preferences":["email","push"]}}}" data-elevate-hotwire-validation-url-value="/elevate/users" id="new_elevate_lookbook_user_form" class="form elevate_lookbook_user-form" action="/elevate/users" accept-charset="UTF-8" method="post"><input type="hidden" name="authenticity_token" value="OxTrCqfZhLWKIKTH6iv-TNSuHwz6T9KW6aBPVT3BWxjeM4aMTOMYgUVceyD7tKv_znH_flY8P09kwXJ6j_bIAg" autocomplete="off" />
        <div class="input-block" id="elevate_lookbook_user_last_name__wrapper" data-controller="elevate-hotwire-field" data-elevate-hotwire-field-elevate-hotwire-outlet="form" data-elevate-hotwire-field-name-value="elevate_lookbook_user[last_name]">
          <input data-elevate-hotwire-field-target="hidden" autocomplete="off" type="hidden" value="Doe" name="elevate_lookbook_user[last_name]" />
          <div class="botyglot--form-component--field--wrapper">
            <input class="botyglot--form-component--field--input" data-elevate-hotwire-field-target="input" placeholder="Enter your last name" type="text" id="elevate_lookbook_user_last_name" />
          </div>
        </div>
      </form>
    </main>
  </body>
  <script>
    /* see this fix: https://github.com/rails/importmap-rails/issues/65#issuecomment-999939960 */
    window.process = { env: { NODE_ENV: 'production'} }
  </script>
</html>
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<%- url = Elevate::Engine.routes.url_helpers.users_path -%>
<%= elevate_form_with(model: user, url: url, scope: :elevate_lookbook_user) do |form| %>
  <%= render Elevate::Hotwire::FieldComponent.new(
    form: form,
    field_name: :last_name,
    placeholder: "Enter your last name",
  ) %>
<% end %>

Edit-form scenario — model already has a value; the field hydrates with the --not-empty class instead of --empty.

No params configured.

No assets to display.

app/components/elevate/hotwire/field/field_controller.js

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// Field-level Stimulus controller for Elevate::Hotwire::FieldComponent (and any
// future form field component built on the same pattern).
//
// Composes the field-side behaviors:
//   - useFormState           → outlet wiring, store reads/writes, subscriptions
//   - useTouchOnFocus        → focus → markFieldTouched
//   - useEmptyClass          → wrapper class based on emptiness
//   - useValidityClasses     → input class based on touched + error/warning
//   - useErrorPlaceholder    → inline error/warning <span> (when displayError)
//   - useSuggestedValue      → reactive auto-fill (when suggestValue is set)
//
// Plus a value adapter (strategy, not behavior):
//   - identityAdapter for plain text fields
//   - makeNumericFormatAdapter(locale) for locale-aware numeric formatting
//
// The adapter has two methods:
//   - formatForDisplay(storeValue) → string  (for the visible input)
//   - parseFromInput(input) → any | SKIP_WRITE  (for store writes)
//
// Decisions: 0002 (runtime via outlet), 0003 (store + outlets), 0005
// (composable behaviors), 0007 (state-derived rendering in JS).
import { Controller } from "@hotwired/stimulus";
import { useFormState }        from "../../../../assets/javascripts/hotwire/behaviors/use_form_state";
import { useTouchOnFocus }     from "../../../../assets/javascripts/hotwire/behaviors/use_touch_on_focus";
import { useEmptyClass }       from "../../../../assets/javascripts/hotwire/behaviors/use_empty_class";
import { useValidityClasses }  from "../../../../assets/javascripts/hotwire/behaviors/use_validity_classes";
import { useErrorPlaceholder } from "../../../../assets/javascripts/hotwire/behaviors/use_error_placeholder";
import { useSuggestedValue }   from "../../../../assets/javascripts/hotwire/behaviors/use_suggested_value";
import { identityAdapter }            from "../../../../assets/javascripts/hotwire/adapters/identity";
import { makeNumericFormatAdapter }   from "../../../../assets/javascripts/hotwire/adapters/numeric_format";
import { SKIP_WRITE }                 from "../../../../assets/javascripts/hotwire/adapters/sentinels";
export default class ElevateHotwireFieldController extends Controller {
  static outlets = ['elevate-hotwire'];
  static targets = ['input', 'hidden'];
  static values = {
    name:          String,
    displayError:  { type: Boolean, default: true },
    numericFormat: { type: String,  default: '' }, // '' | 'true' | 'en' | 'fr'
    suggestValue:  { type: String,  default: '' }, // '' | 'true' | 'force'
  };
  connect() {
    const name = this.nameValue;
    const locale = this.#numericLocale();
    const adapter = locale ? makeNumericFormatAdapter(locale) : identityAdapter;
    // The hidden input is the only form-submitting one (the visible input has
    // its `name` stripped), so it must carry the store's CANONICAL value as a
    // string — never the adapter's display string, which may add locale
    // grouping (numeric_format renders "1234.56" → "1,234.56" for display).
    // The store already holds the canonical value (parseFromInput writes it;
    // the JSON wire payload hydrates it), so stringifying it is all the hidden
    // needs. For plain text fields display === canonical, so this matches the
    // previous behavior; it only diverges for formatting adapters.
    const canonical = (v) => (v == null ? "" : String(v));
    // The controller's own element is the outer "input-block" wrapper that
    // carries the empty/not-empty class — matching legacy ComponentWrapper.vue.
    //
    // onValueChange mirrors store value changes onto the hidden input (canonical,
    // for form submission) and the visible input (display, via the adapter).
    useFormState(this, {
      name,
      onValueChange: (v) => {
        this.hiddenTarget.value = canonical(v);
        this.inputTarget.value  = adapter.formatForDisplay(v);
      },
    });
    useTouchOnFocus(this, { target: this.inputTarget });
    useEmptyClass(this, { name, wrapper: this.element });
    useValidityClasses(this, { name, input: this.inputTarget });
    if (this.displayErrorValue) {
      useErrorPlaceholder(this, { name, parent: this.element });
    }
    // Input-display sync from the store. We do this in two places:
    //
    //   1. Now, synchronously. Covers the common case where the outlet is
    //      already connected at use-time — store.getValue(name) returns the
    //      real value, the adapter formats it, both inputs show it.
    //
    //   2. After outlet-connected fires, AFTER all behavior wrappers
    //      resolve. Covers the deferred case where the outlet isn't ready
    //      yet during connect() (e.g. a turbo-streamed form): step 1 saw
    //      fieldValue() as undefined and wrote ''. By the time outlet-
    //      connected has rippled through every wrapper, useSuggestedValue
    //      has potentially written a suggestion to the store, and
    //      useFormState's subscription is live for future changes — so
    //      this is the right moment to format the *now-current* value into
    //      both inputs.
    //
    // The store-side `subscribe` wrapper deliberately suppresses the
    // initial fire (it requires `next !== last`), which is why we can't
    // rely on `onValueChange` to do this for us at outlet-connect time.
    //
    // We sync BOTH the visible and the hidden input. The hidden input is
    // the only form-submitting one (visible has its `name` stripped), so
    // it must carry the canonical store value at all times. Relying on
    // Rails' server-rendered `value=` attribute breaks down for
    // Ransack::Search-backed forms: Ransack predicate methods like
    // `firstname_cont` are exposed via `method_missing` without a matching
    // `respond_to_missing?`, so Rails' `Tags::Base#value(object)` (which
    // gates the read on `object.respond_to?(method_name)`) returns nil
    // and `hidden_field` omits the value attribute entirely. The form
    // would then submit `q[firstname_cont]=` even though the URL it came
    // from carried `q[firstname_cont]=john`. Making the store the single
    // source of truth on connect fixes that — the same JSON wire payload
    // that hydrates the store already carries the value (via
    // `Oscar::Common::RansackWrapper.to_builder(@q).attributes!`).
    const syncFromStore = () => {
      const raw     = this.fieldValue();
      const display = adapter.formatForDisplay(raw);
      this.inputTarget.value = display;
      // Sync hidden only when the store has a meaningful value — empty
      // display means either "store has no entry for this field" (e.g. an
      // AR-record with a nil attribute) or "user cleared it" (handled by
      // onValueChange on the actual change, not at init). Touching the
      // hidden in the empty case would force a `value=""` attribute onto
      // the DOM and break byte-for-byte parity with the legacy Vue
      // baseline in `spec/parity/`, which renders no `value` attribute
      // for empty fields. The Ransack case the surrounding comment
      // describes always has a non-empty `display` (the JSON wire payload
      // includes the value precisely because the user filtered on it).
      // The hidden gets the CANONICAL value (display is for the visible input).
      if (display !== "") this.hiddenTarget.value = canonical(raw);
    };
    syncFromStore();
    // Visible input → store, through the adapter. The adapter may return
    // SKIP_WRITE (e.g. mid-decimal-separator typing) to ask the controller
    // to leave the store alone for this keystroke.
    this.#inputHandler = (e) => {
      const parsed = adapter.parseFromInput(e.target.value);
      if (parsed !== SKIP_WRITE) this.updateFieldValue(parsed);
    };
    this.inputTarget.addEventListener('input', this.#inputHandler);
    useSuggestedValue(this, { name, mode: this.suggestValueValue });
    // Late-sync wrapper: install LAST so it runs AFTER every behavior's
    // own outlet-connected setup. See the comment above.
    const prevOutletConnected = this.elevateHotwireOutletConnected?.bind(this);
    this.elevateHotwireOutletConnected = function (outlet, element) {
      if (prevOutletConnected) prevOutletConnected(outlet, element);
      syncFromStore();
    };
  }
  disconnect() {
    if (this.#inputHandler) {
      this.inputTarget.removeEventListener('input', this.#inputHandler);
    }
    super.disconnect();
  }
  #inputHandler = null;
  // 'true' / true  → 'en'
  // 'en' / 'fr'    → as-is
  // anything else  → null (numeric formatting disabled)
  #numericLocale() {
    const v = this.numericFormatValue;
    if (v === 'true' || v === true) return 'en';
    if (v === 'en' || v === 'fr')   return v;
    return null;
  }
}