Bootstrap Bundle Laravel Package

Getting Started

First, the reality check. This is a Symfony bundle (Smirik\BootstrapBundle), not a Laravel package. You cannot composer require it into a Laravel app — the service-container extension, bundle registration in AppKernel.php, and Twig form-theme conventions have no counterpart in Laravel. If you're on a modern Symfony (5/6/7) app, the framework already ships bootstrap_5_layout.html.twig, so you don't need it either.

What you actually do with this package day-to-day: treat it as reference material. It contains two reusable things worth reading: the Bootstrap asset include and the form theme. You port them.

Read in this order:

1. Resources/public/ — the vendored Bootstrap CSS/JS. Check the version first (this predates BS4/5; expect BS2/3 class names like control-group, has-error, help-block).
2. Resources/views/Form/ (form_div_layout.html.twig overrides) — the actual value: how each form_row/form_widget/form_errors block is wrapped.
3. Resources/views/layout.html.twig — the block naming and asset include pattern.
4. DependencyInjection/ and Resources/config/ — to see whether anything is configurable (usually not much).

First use case — port the form theme to Blade. The Symfony block looks roughly like:

{% block form_row %}
  <div class="form-group{% if errors|length %} has-error{% endif %}">
    {{ form_label(form) }}
    {{ form_widget(form) }}
    {{ form_errors(form) }}
  </div>
{% endblock %}

The Laravel equivalent is a Blade component in resources/views/components/form/field.blade.php:

@props(['label' => null, 'name', 'error' => null])
<div class="mb-3 {{ $error ? 'has-error' : '' }}">
  @if($label)
    <label for="{{ $name }}" class="form-label">{{ $label }}</label>
  @endif
  {{ $slot }}
  @error($name)
    <span class="form-text text-danger">{{ $message }}</span>
  @enderror
</div>

That is the whole package's value, reproduced in your own repo in under an hour — and under your own review.

Implementation Patterns

1. Asset loading — skip the bundle's approach, use Vite. The bundle's job is to emit <link>/<script> for Bootstrap. In Laravel that's your build pipeline:

// resources/js/app.js
import 'bootstrap';
import 'bootstrap/dist/css/bootstrap.min.css';

Then reference it once in the base layout: @vite(['resources/js/app.js']). The bundle's Resources/public convention is the Symfony Assetic-era equivalent — don't try to reproduce it.

2. Form field rendering as components. The most useful pattern to carry over is the "wrap label + widget + errors in a fixed container" convention. Build one <x-form.field> wrapper plus thin per-type components (<x-form.input>, <x-form.select>, <x-form.checkbox>). Keep the markup in one place so a Bootstrap major upgrade is a single-file change.

3. Error display convention. The bundle consistently treats errors as a sibling of the input (not nested), with an has-error wrapper class. In Blade/BS5 the equivalent is:

<input class="form-control @error('email') is-invalid @enderror" ...>
@error('email')<div class="invalid-feedback">{{ $message }}</div>@enderror

Establish this convention once; the bundle's discipline here is worth borrowing even if the class names aren't.

4. Layout/block convention. The bundle ships a base layout you extend with {% block body %}. The Blade analogue is a layouts/app.blade.php with @yield('content') or $slot. If you're already standardizing layouts, this is where the reference is most useful — compare your block structure to what the bundle chose (it's a reasonable, if old, starting point for admin screens).

5. If you're genuinely on Symfony. Don't port it — register the built-in theme instead:

twig:
    form_themes:
        - 'bootstrap_5_layout.html.twig'

That's first-party, maintained, version-locked with the framework. The bundle is essentially this same idea, frozen in 2013.

Gotchas and Tips

• Bootstrap version drift is the biggest trap. This bundle targets Bootstrap 2.x/3.x. Class names have changed (control-group → form-group → mb-3, help-block → form-text, has-error → is-invalid). Copying markup verbatim into a BS5 app will produce visually broken but functionally "passing" forms — the failure mode is cosmetic, so tests won't catch it.
• form_errors is a separate block from form_widget. In a partial port, it's easy to render both form_errors(form) inside form_widget and again inside form_row, producing duplicated error messages. If you port, keep the error rendering in exactly one place.
• Form theme registration ordering matters. In Symfony, later twig.form.resources entries override earlier ones — overriding only a few blocks lets the rest fall through to a base theme you may not expect. If porting to Symfony, check what form_div_layout.html.twig is still rendering for untouched blocks.
• Assets publishing is fragile. assets:install --symlink and assetic:dump fail silently on hardened CI (symlink restrictions), Windows developer machines, and Docker volumes. If you find yourself debugging "why are assets not updating," the answer is usually a stale symlink — assets:install --symlink --relative or a hard copy avoids it. Don't bother resurrecting Assetic; it's dead on both Laravel and modern Symfony alike.
• Check the DI extension for real config. Most of these small bundles expose almost nothing configurable — the Extension class and Resources/config/*.yml will tell you in 30 seconds whether there's a knob worth looking at. Usually there isn't.
• The layout may not use your asset pipeline. If the bundle's layout.html.twig references paths under Resources/public, you'll need assets:install before anything renders — but once ported to Blade/Vite, this whole class of gotcha disappears. That's the argument for porting rather than depending.
• Extension points are effectively none. There's no service API, no events, no hooks. The only "extension" is overriding Twig blocks — which means your customizations are fragile against any upstream change. Vendoring the templates as your own code is strictly better than depending on them.

Bottom line for a Laravel team: you will never require this. Extract the form theme (one file), translate class names to your Bootstrap major, and move on. The day-to-day leverage is small and one-time, but the form-theme pattern is worth a look before you write your own.