A library for building forms in PureScript Halogen applications with minimal boilerplate.
Formless is a library for building forms in PureScript Halogen applications. It provides a type-safe, higher-order component that manages form state, validation, and user interactions, significantly reducing the boilerplate typically required for form handling. It solves the problem of repetitive and error-prone form code by leveraging PureScript's type system.
PureScript developers building interactive web applications with the Halogen framework who need robust, type-safe form handling.
Developers choose Formless for its strong type safety, minimal boilerplate, and seamless integration with Halogen. Its unique approach using form rows and reusable type synonyms ensures correctness and reduces duplication.
Forms for Halogen
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Formless enforces compile-time safety by defining input, error, and output types for each field, as shown in the form type example where fields like 'age' specify String input and Int output.
It automates form state management, validation, and event handling, reducing repetitive code; the README highlights how initial values and types can be reused via form rows.
Validation functions can be pure or effectful and access the entire form state, enabling complex scenarios like dependent field validation, demonstrated in the handleQuery section.
Form rows serve as a single source of truth for type synonyms, allowing easy specialization and reuse, as illustrated with FormInputs derived from the form row.
The README admits that FormContext and FormlessAction types can be confusing initially, requiring deep familiarity with Halogen and PureScript's type system.
Formless is unstyled and requires manual wiring of form fields in render functions, adding development overhead for UI implementation, as seen in the basic input example.
Installation may require manual addition to local package sets, and defining internal component types involves verbose boilerplate, increasing initial setup complexity.