@presage-kit/react

React bindings for Presage. Provides a context provider, declarative components, and hooks.

pnpm add @presage-kit/core @presage-kit/react

<AdaptiveProvider>

Provides the AdaptiveClient to descendant components via React context.

import { AdaptiveProvider } from '@presage-kit/react'

<AdaptiveProvider client={client}>
  <App />
</AdaptiveProvider>

Props:

Prop	Type	Required	Description
client	AdaptiveClient	Yes	Client from createAdaptiveClient()
children	ReactNode	Yes	Component tree

<Adaptive>

Declares an adaptation point. Evaluates rules and renders the matching <Variant> child.

import { Adaptive, Variant } from '@presage-kit/react'

<Adaptive id="onboarding" defaultVariant="standard">
  <Variant id="guided-tour"><GuidedTour /></Variant>
  <Variant id="standard"><StandardView /></Variant>
</Adaptive>

Props:

Prop	Type	Required	Description
id	string	Yes	Adaptation point identifier
defaultVariant	string	Yes	Fallback variant ID
children	ReactNode	Yes	Must contain <Variant> elements

Behavior:

• Extracts <Variant> children and their IDs
• Calls useAdaptive() internally with the extracted variant list
• Renders the content of the matching <Variant>
• Returns null if no variant matches (shouldn’t happen with defaultVariant)

<Variant>

Declares a variant within an <Adaptive> block. Does not render anything on its own — <Adaptive> controls which variant is visible.

<Variant id="guided-tour">
  <GuidedTour />
</Variant>

Props:

Prop	Type	Required	Description
id	string	Yes	Variant identifier (referenced in rule actions)
children	ReactNode	Yes	Content to render when selected

<AdaptiveNav>

Renders navigation items with adaptive reordering.

import { AdaptiveNav, type NavItem } from '@presage-kit/react'

<AdaptiveNav<MenuItem>
  id="sidebar"
  items={menuItems}
  renderItem={(item, index) => <NavLink key={item.id} item={item} />}
/>

Props:

Prop	Type	Required	Description
id	string	Yes	Adaptation point identifier
items	T[]	Yes	Array of items extending NavItem
renderItem	(item: T, index: number) => ReactNode	Yes	Render function per item

NavItem interface:

interface NavItem {
  id: string
  [key: string]: unknown
}

Action handling:

• { type: 'reorder', order: [...] } — Reorders items to match the order array. Items not in the array are appended at the end.
• { type: 'hide' } — Returns null (hides the entire navigation).
• Other actions or no match — Renders items in their original order.

Generics: AdaptiveNav is generic over the item type:

interface MenuItem extends NavItem {
  label: string
  href: string
  icon: React.ReactNode
}

<AdaptiveNav<MenuItem>
  id="sidebar"
  items={menuItems}
  renderItem={(item) => (
    <a href={item.href}>{item.icon} {item.label}</a>
  )}
/>

useAdaptive(adaptationId, config)

Resolves an adaptation point and tracks impressions.

import { useAdaptive } from '@presage-kit/react'

const { selectedVariant, resolution, context, track } = useAdaptive('feature-panel', {
  variants: ['compact', 'expanded', 'hidden'] as const,
  defaultVariant: 'compact',
})

Parameters:

Param	Type	Description
adaptationId	string	Unique adaptation point ID
config.variants	readonly V[]	Array of variant IDs
config.defaultVariant	NoInfer<V>	Default variant (must be in variants)
config.strategy	Strategy	Optional. Defaults to { type: 'rules' }

Return type: UseAdaptiveResult<V>

Field	Type	Description
selectedVariant	V	Currently selected variant
resolution	ResolvedAdaptation	Full resolution metadata
context	UserContext	Current user context
track	(event: string, props?: Record<string, unknown>) => void	Track function that auto-attaches _adaptationId

Impressions: Automatically tracks presage:impression when selectedVariant changes, with properties:

{
  adaptationId: string
  variant: string
  strategy: string
}

TypeScript: Uses NoInfer<V> to prevent defaultVariant from widening the type. Use as const on the variants array for best type inference:

const { selectedVariant } = useAdaptive('x', {
  variants: ['a', 'b', 'c'] as const,
  defaultVariant: 'a',
})
// selectedVariant: 'a' | 'b' | 'c'

useVariant(adaptationId, config)

Lightweight hook returning only the selected variant string.

import { useVariant } from '@presage-kit/react'

const variant = useVariant('layout', {
  variants: ['sidebar', 'topnav'] as const,
  defaultVariant: 'sidebar',
})
// variant: 'sidebar' | 'topnav'

Parameters: Same as useAdaptive().

Return type: V — The selected variant string.

Internally delegates to useAdaptive() and destructures selectedVariant.

useAdaptiveClient()

Returns the AdaptiveClient from context.

import { useAdaptiveClient } from '@presage-kit/react'

const client = useAdaptiveClient()

client.track('button_clicked', { buttonId: 'cta' })
client.identify('user-456', { role: 'editor' })
const ctx = client.getContext()

Return type: AdaptiveClient

Throws: Error if called outside <AdaptiveProvider>.