Transition

SlideTransition describes what happens when the active Page changes. There is no default animation: pages snap unless the deck exports a transition or an incoming page defines its own override.

slides/q2-launch/index.tsx

import type { Page, SlideTransition } from '@open-slide/core';

const Cover: Page = () => <section>…</section>;
const Agenda: Page = () => <section>…</section>;

export const transition: SlideTransition = {
  duration: 220,
  exit: {
    duration: 140,
    easing: 'cubic-bezier(0.4, 0, 1, 1)',
    keyframes: [
      { opacity: 1, transform: 'translateY(0)' },
      { opacity: 0, transform: 'translateY(-4px)' },
    ],
  },
  enter: {
    duration: 220,
    delay: 80,
    easing: 'cubic-bezier(0, 0, 0.2, 1)',
    keyframes: [
      { opacity: 0, transform: 'translateY(6px)' },
      { opacity: 1, transform: 'translateY(0)' },
    ],
  },
};

export default [Cover, Agenda] satisfies Page[];

prefers-reduced-motion: reduce is honored automatically.

Where It Lives

There are two declaration surfaces:

export const transition in the slide module sets the deck default.
Page.transition = … sets an override for one page.

The incoming page wins. Navigating Cover → Agenda uses Agenda.transition ?? module.transition; the selected exit runs on Cover, and enter runs on Agenda. Navigating backward uses the page you are returning to.

const Cover: Page = () => <section>…</section>;
const Agenda: Page = () => <section>…</section>;

export const transition: SlideTransition = {
  duration: 220,
  enter: {
    keyframes: [{ opacity: 0 }, { opacity: 1 }],
  },
};

Agenda.transition = {
  duration: 320,
  enter: {
    keyframes: [
      { opacity: 0, transform: 'scale(0.98)' },
      { opacity: 1, transform: 'scale(1)' },
    ],
  },
};

Direction

During a page transition, the wrapper exposes:

Surface	Forward	Backward
`--osd-dir`	`1`	`-1`
`data-osd-dir`	`forward`	`backward`

Use it when motion has a literal direction:

{
  transform: 'translateX(calc(var(--osd-dir, 1) * 8px))',
}

Most decks should keep a single restrained motion family: short duration, subtle distance, opacity included, and no different transition vocabulary on every page.

Shared Elements

SlideTransition.sharedElements enables SharedElement matching for objects that should visually continue across two pages.

export const transition: SlideTransition = {
  duration: 600,
  sharedElements: {
    duration: 600,
    easing: 'cubic-bezier(0.22, 1, 0.36, 1)',
  },
};

For the full schema and a reusable family of examples, see SlideTransition.

Transition

Where It Lives

Direction

Shared Elements

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