@rilaykit/core

@rilaykit/core

The foundation of RilayKit — a schema-first, headless form library for React.

@rilaykit/core provides the component registry, type system, validation engine, condition system, and monitoring infrastructure that powers the entire RilayKit ecosystem.

Installation

# pnpm (recommended)
pnpm add @rilaykit/core

# npm
npm install @rilaykit/core

# yarn
yarn add @rilaykit/core

# bun
bun add @rilaykit/core

Requirements

• React >= 18
• TypeScript >= 5

Quick Start

1. Define Your Components

import { ComponentRenderer } from '@rilaykit/core';

interface InputProps {
  label: string;
  type?: string;
  placeholder?: string;
}

const Input: ComponentRenderer<InputProps> = ({
  id, value, onChange, onBlur, error, props,
}) => (
  <div>
    <label htmlFor={id}>{props.label}</label>
    <input
      id={id}
      type={props.type || 'text'}
      value={value || ''}
      onChange={(e) => onChange?.(e.target.value)}
      onBlur={onBlur}
    />
    {error && <p>{error[0].message}</p>}
  </div>
);

2. Create a Registry

import { ril } from '@rilaykit/core';

const rilay = ril.create()
  .addComponent('input', { renderer: Input })
  .addComponent('select', { renderer: Select });

Each .addComponent() call returns a new typed instance — TypeScript tracks registered types and propagates component prop types through the entire builder chain.

Features

Component Registry

An immutable, type-safe registry that maps component type names to their renderers and default props. Configured once, used across your entire application.

const rilay = ril.create()
  .addComponent('input', { renderer: Input })
  .addComponent('textarea', { renderer: Textarea })
  .addComponent('select', { renderer: Select });

// TypeScript knows exactly which types are valid
// and narrows props accordingly

Validation Engine

Universal validation based on Standard Schema. Use built-in validators, any Standard Schema compatible library (Zod, Valibot, ArkType, Yup...), or write custom validators — no adapters needed.

import { required, email, minLength, custom } from '@rilaykit/core';

// Built-in validators
validation: { validate: [required(), email()] }

// Zod (or any Standard Schema library) — no adapter
import { z } from 'zod';
validation: { validate: z.string().email() }

// Custom validators
const strongPassword = custom(
  (value) => /(?=.*[A-Z])(?=.*\d)/.test(value),
  'Must contain uppercase and number'
);

// Mix them freely
validation: { validate: [required(), z.string().min(8), strongPassword] }

Built-in validators: required, email, url, pattern, min, max, minLength, maxLength, number, custom, async, combine

Condition System

Declarative conditional logic with the when() builder. No useEffect, no imperative state management.

import { when } from '@rilaykit/core';

// Visibility
conditions: { visible: when('accountType').equals('business') }

// Combine with boolean logic
conditions: {
  visible: when('country').in(['US', 'CA']).and().field('age').greaterThan(18),
  required: when('accountType').equals('business'),
}

Operators: equals, notEquals, greaterThan, lessThan, greaterThanOrEqual, lessThanOrEqual, contains, notContains, in, notIn, matches, exists, notExists

Monitoring

Pluggable monitoring system with event buffering, performance profiling, and automatic alerts.

import { initializeMonitoring } from '@rilaykit/core';

const monitor = initializeMonitoring({
  adapters: [myAdapter],
  bufferSize: 100,
  flushInterval: 5000,
});

API Overview

Export	Description
ril	Component registry builder with type accumulation
when	Condition builder for declarative field logic
required, email, url, pattern, min, max, minLength, maxLength, number	Built-in validators
custom, async, combine	Custom and composite validators
initializeMonitoring, RilayMonitor	Monitoring system
evaluateCondition, ConditionDependencyGraph	Condition evaluation utilities

Architecture

@rilaykit/core is the foundation layer with no React rendering dependency. It can run in Node, in tests, and in build scripts. The other RilayKit packages build on top of it:

@rilaykit/core          ← you are here
    ↑
@rilaykit/forms         (form builder + React components)
    ↑
@rilaykit/workflow      (multi-step workflows)

Documentation

Full documentation at rilay.dev:

• Installation
• Quick Start
• Component Registry
• Validation
• Conditions
• TypeScript Support
• API Reference

License

MIT — see LICENSE for details.