structyl is an open-source, TypeScript-first React component library with 90+ accessible components. It combines WAI-ARIA compliant headless primitives with Tailwind CSS v4 styled wrappers, a runtime theming system, and a first-class DataTable — all in independently-versioned npm packages.

How does structyl differ from shadcn/ui?

structyl ships as actual npm packages (pnpm add @structyl/styled) rather than copy-paste code snippets. It adds a runtime theming system that switches themes without a page reload, a feature-complete DataTable, 24+ React hooks, and 90+ components — significantly more than shadcn/ui out of the box.

How does structyl compare to Radix UI?

structyl builds on the same headless-first philosophy as Radix UI but adds a complete Tailwind-styled layer, runtime theming with CSS variables, dark mode, a DataTable, and chart components. Radix is primitives-only; structyl is a full component library ready to use.

Is structyl compatible with Next.js App Router?

Yes. All structyl components that use React hooks are marked with 'use client'. The library is SSR-safe and fully compatible with Next.js 15 App Router and React Server Components.

Does structyl support dark mode?

Yes. structyl includes a ThemeProvider that supports system, light, and dark modes. Theme switches happen instantly using CSS custom properties — no page reload required and no flash of unstyled content.

How do I install structyl?

Install the main package with: pnpm add @structyl/styled (or npm install @structyl/styled). Then wrap your app in ThemeProvider from @structyl/themes and add Toaster from @structyl/styled to your root layout.

Is structyl free and open source?

Yes. structyl is MIT licensed and completely free. All packages are published to npm under the @structyl scope.

Does structyl support TypeScript?

Yes. structyl is built with TypeScript strict mode throughout. All components export their prop types and the library ships with full type definitions. There is no any usage in the public API.

What styling system does structyl use?

structyl uses Tailwind CSS v4 for styling, tailwind-variants for type-safe variant APIs, and tailwind-merge for class conflict resolution. All colors and design tokens are CSS custom properties that integrate with the runtime theming system.

Does structyl have a DataTable component?

Yes. structyl includes a first-class DataTable in the @structyl/data-table package, built on @tanstack/table-core. It supports sorting, multi-column filtering, pagination, row selection, column resizing, and row virtualization via @tanstack/react-virtual.

Calendar API

View component

The full prop reference for the Calendar component. A standalone calendar for selecting dates.

Import

tsx

import { Calendar } from '@structyl/styled';

Props

Calendar (styled)

Ready-to-use calendar component with built-in layout, styling, and navigation controls

Prop	Type	Default
mode#	`'single' \| 'range' \| 'multiple'` Selection mode: single date, date range, or multiple dates	'single'
selected#	`Date \| Date[] \| { from?: Date; to?: Date } \| undefined` Selected value (controlled); shape depends on mode	—
defaultSelected#	`Date \| Date[] \| { from?: Date; to?: Date } \| undefined` Initial selected value (uncontrolled)	—
onSelect#	`(value: Date \| Date[] \| { from?: Date; to?: Date } \| undefined) => void` Callback fired when selection changes	—
month#	`Date` Displayed month (controlled)	—
defaultMonth#	`Date` Initial month (uncontrolled); defaults to month of selected value or today	—
onMonthChange#	`(month: Date) => void` Callback fired when displayed month changes	—
minDate#	`Date` Earliest selectable date (inclusive)	—
maxDate#	`Date` Latest selectable date (inclusive)	—
disablePast#	`boolean` Disable all dates before today	—
disableFuture#	`boolean` Disable all dates after today	—
disabled#	`boolean` Disable entire calendar	—
disabledDays#	`(date: Date) => boolean` Predicate to disable specific dates	—
shouldDisableDate#	`(date: Date) => boolean` Predicate to disable specific dates (alternative to disabledDays)	—
shouldDisableMonth#	`(date: Date) => boolean` Predicate to disable months for month/year navigation	—
shouldDisableYear#	`(date: Date) => boolean` Predicate to disable years for month/year navigation	—
weekStartsOn#	`number` First day of week (0=Sunday, 1=Monday, etc)	0
locale#	`string` BCP 47 locale code for formatting dates and day names	—
disableHighlightToday#	`boolean` Don't highlight today's date	—
displayWeekNumber#	`boolean` Show ISO week numbers in grid	—
fixedWeekNumber#	`number` Fixed number of weeks to display (pads with next/prev month dates)	—
showOutsideDays#	`boolean` Show dates from adjacent months in calendar grid	true
dayOfWeekFormatter#	`(date: Date) => string` Custom formatter for weekday headers	—
onYearChange#	`(year: Date) => void` Callback fired when displayed year changes	—
className#	`string` Additional CSS classes	—
asChild#	`boolean` Render as child of another component	—

Calendar.Root (primitive)

Headless calendar root providing selection state and context

Prop	Type	Default
mode#	`'single' \| 'range' \| 'multiple'` Selection mode: single date, date range, or multiple dates	'single'
selected#	`Date \| Date[] \| { from?: Date; to?: Date } \| undefined` Selected value (controlled); shape depends on mode	—
defaultSelected#	`Date \| Date[] \| { from?: Date; to?: Date } \| undefined` Initial selected value (uncontrolled)	—
onSelect#	`(value: Date \| Date[] \| { from?: Date; to?: Date } \| undefined) => void` Callback fired when selection changes	—
month#	`Date` Displayed month (controlled)	—
defaultMonth#	`Date` Initial month (uncontrolled); defaults to month of selected value or today	—
onMonthChange#	`(month: Date) => void` Callback fired when displayed month changes	—
minDate#	`Date` Earliest selectable date (inclusive)	—
maxDate#	`Date` Latest selectable date (inclusive)	—
disablePast#	`boolean` Disable all dates before today	—
disableFuture#	`boolean` Disable all dates after today	—
disabled#	`boolean` Disable entire calendar	—
disabledDays#	`(date: Date) => boolean` Predicate to disable specific dates	—
shouldDisableDate#	`(date: Date) => boolean` Predicate to disable specific dates (alternative to disabledDays)	—
shouldDisableMonth#	`(date: Date) => boolean` Predicate to disable months for month/year navigation	—
shouldDisableYear#	`(date: Date) => boolean` Predicate to disable years for month/year navigation	—
weekStartsOn#	`number` First day of week (0=Sunday, 1=Monday, etc)	0
locale#	`string` BCP 47 locale code for formatting dates and day names	—
disableHighlightToday#	`boolean` Don't highlight today's date	—
displayWeekNumber#	`boolean` Show ISO week numbers in grid	—
fixedWeekNumber#	`number` Fixed number of weeks to display (pads with next/prev month dates)	—
dayOfWeekFormatter#	`(date: Date) => string` Custom formatter for weekday headers	—
onYearChange#	`(year: Date) => void` Callback fired when displayed year changes	—
className#	`string` Additional CSS classes	—
asChild#	`boolean` Render as child of another component	—

Calendar.Header

Container for calendar header controls (previous, heading, next buttons)

Prop	Type	Default
className#	`string` Additional CSS classes	—

Calendar.PreviousButton

Button to navigate to previous month

Prop	Type	Default
onClick#	`(event: React.MouseEvent<HTMLButtonElement>) => void` Click handler (composition automatically adds previous month navigation)	—
className#	`string` Additional CSS classes	—

Calendar.NextButton

Button to navigate to next month

Prop	Type	Default
onClick#	`(event: React.MouseEvent<HTMLButtonElement>) => void` Click handler (composition automatically adds next month navigation)	—
className#	`string` Additional CSS classes	—

Calendar.Heading

Displays current month and year with live region updates

Prop	Type	Default
format#	`Intl.DateTimeFormatOptions` Date format options for Intl.DateTimeFormat	{ month: 'long', year: 'numeric' }
locale#	`string` Locale override for formatting (falls back to Calendar.Root locale)	—
className#	`string` Additional CSS classes	—

Calendar.Grid

Table wrapper for calendar days

Prop	Type	Default
className#	`string` Additional CSS classes	—

Calendar.GridHead

Table header displaying day-of-week labels

Prop	Type	Default
format#	`'narrow' \| 'short' \| 'long'` Day name format width	'narrow'
locale#	`string` Locale override for day name formatting	—
className#	`string` Additional CSS classes	—

Calendar.GridBody

Table body rendering weeks and days using render function

Prop	Type	Default
children#	`(date: Date, props: { isOutsideMonth: boolean }) => React.ReactNode` Render function for each day cell	—
className#	`string` Additional CSS classes	—

Calendar.Day

Individual day button with selection state and keyboard navigation

Prop	Type	Default
date#	`Date` Date this button represents (required)	—
isOutsideMonth#	`boolean` Whether date is outside current displayed month	—
onClick#	`(event: React.MouseEvent<HTMLButtonElement>) => void` Click handler (composition automatically adds date selection)	—
onKeyDown#	`(event: React.KeyboardEvent<HTMLButtonElement>) => void` Keyboard handler (composition supports arrow keys, Page Up/Down, Home, End)	—
className#	`string` Additional CSS classes	—
disabled#	`boolean` Disables the day button	—

Source code

If you didn't find what you need here, read the component implementation .