Phlex::Sorbet

Type-safe Props for Phlex views and components, powered by sorbet-schema.

Quick Example

class UserCard < Phlex::HTML
  include Phlex::Sorbet

  class Props < T::Struct
    const :user_id, Integer
    const :show_email, T::Boolean, default: false
  end

  def view_template
    div do
      span { "User ##{user_id}" }
      span { "email visible" } if show_email
    end
  end
end

UserCard.new(user_id: 1).call                       # => "<div><span>User #1</span></div>"
UserCard.new(user_id: 1, show_email: true).call     # => "<div>...<span>email visible</span></div>"
UserCard.new(user_id: "1").call                     # OK — coerced via sorbet-schema
UserCard.new(user_id: "abc").call                   # => raises Phlex::Sorbet::InvalidPropsError
UserCard.new                                        # => raises Phlex::Sorbet::InvalidPropsError (missing user_id)

Features

• Direct prop access — use user_id inside view_template instead of props.user_id.
• Type safety — props are validated against your Props T::Struct at instantiation time.
• Coercion — strings from controller params are coerced to the declared type via sorbet-schema.
• Nested T::Struct props — fully supported via sorbet-schema.
• Optional Props — components can omit the Props class when they take no props.
• Backward-friendly accessor — props.user_id still works.
• RSpec matchers — have_prop, have_props, accept_props, reject_props.
• Tapioca DSL compiler — generates RBI for initialize and prop accessors.

Installation

bundle add phlex-sorbet

Or:

gem install phlex-sorbet

Usage

Basic component with props

class Button < Phlex::HTML
  include Phlex::Sorbet

  class Props < T::Struct
    const :label, String
    const :variant, Symbol, default: :primary
  end

  def view_template
    button(class: "btn btn-#{variant}") { label }
  end
end

Button.new(label: "Save").call
Button.new(label: "Cancel", variant: :secondary).call

Component without props

The Props constant is optional. Components without props work as usual:

class Spinner < Phlex::HTML
  include Phlex::Sorbet

  def view_template
    div(class: "spinner")
  end
end

Spinner.new.call

Complex types

class TagList < Phlex::HTML
  include Phlex::Sorbet

  class Props < T::Struct
    const :tags, T::Array[String]
    const :filters, T::Hash[String, T.untyped], default: {}
  end

  def view_template
    ul do
      tags.each { |t| li { t } }
    end
  end
end

TagList.new(tags: ["ruby", "phlex"]).call

Nested T::Struct props

class Greeting < Phlex::HTML
  include Phlex::Sorbet

  class User < T::Struct
    const :name, String
    const :email, String
  end

  class Props < T::Struct
    const :user, User
    const :show_email, T::Boolean, default: false
  end

  def view_template
    p { "Hi #{user.name}" }
    p { user.email } if show_email
  end
end

Greeting.new(user: Greeting::User.new(name: "Ada", email: "ada@example.com")).call

Using the props accessor

If you'd rather access props through the struct, the props reader is always available:

class Card < Phlex::HTML
  include Phlex::Sorbet

  class Props < T::Struct
    const :title, String
  end

  def view_template
    h2 { props.title }
  end
end

Coercion (string → typed value)

Because sorbet-schema handles deserialization, props passed as strings (e.g. from controller params) are coerced to the declared type:

UserCard.new(user_id: "42")            # user_id == 42
ToggleSwitch.new(enabled: "true")      # enabled == true

If coercion fails, Phlex::Sorbet::InvalidPropsError is raised.

RSpec matchers

In your spec_helper.rb or rails_helper.rb:

require "phlex/sorbet/rspec"

The matchers are auto-included into RSpec.

have_prop

expect(UserCard).to have_prop(:user_id)
expect(UserCard).to have_prop(:user_id, Integer)
expect(UserCard).to have_prop(:show_email, T::Boolean).with_default(false)

have_props

expect(UserCard).to have_props(user_id: Integer, show_email: T::Boolean)
expect(UserCard).to have_props(:user_id, Integer).and_prop(:show_email, T::Boolean)

accept_props

expect(UserCard).to accept_props(user_id: 1)
expect(UserCard).to accept_props(user_id: 1, show_email: true)

reject_props

expect(UserCard).to reject_props(user_id: "abc")
expect(UserCard).to reject_props(user_id: "abc")
  .with_error(Phlex::Sorbet::InvalidPropsError)

Example test

RSpec.describe UserCard do
  describe "Props" do
    it { is_expected.to have_prop(:user_id, Integer) }
    it { is_expected.to have_prop(:show_email, T::Boolean).with_default(false) }

    it { is_expected.to accept_props(user_id: 1) }
    it { is_expected.to reject_props(user_id: "abc") }
  end

  it "renders the user id" do
    expect(UserCard.new(user_id: 7).call).to include("User #7")
  end
end

Tapioca DSL compiler

This gem ships a Tapioca DSL compiler that generates RBI files describing each component's initialize signature and per-prop accessors.

bundle exec tapioca dsl

For a component:

class UserCard < Phlex::HTML
  include Phlex::Sorbet

  class Props < T::Struct
    const :user_id, Integer
    const :show_email, T::Boolean, default: false
  end
end

It generates RBI like:

class UserCard
  sig { returns(Integer) }
  def user_id; end

  sig { returns(T::Boolean) }
  def show_email; end

  sig { params(user_id: Integer, show_email: T::Boolean).void }
  def initialize(user_id:, show_email: T.unsafe(nil)); end
end

License

MIT.