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Measured entry

motion-primitives-transition-panel

transition-effectspatialmotion on file

A client-side React primitive that animates switching among indexed child panels with AnimatePresence and a motion element. It ships as TypeScript registry source, depends on motion/react, and imports the conventional shadcn cn helper through the @ alias.

Specimen
Motion capture of the mounted demo, recorded by the harness. No audio track.
Harness screenshot of motion-primitives-transition-panel at 375 pixels wide
Harness screenshot at 375 pixels wide. No horizontal overflow recorded.
Harness screenshot of motion-primitives-transition-panel at 768 pixels wide
Harness screenshot at 768 pixels wide. No horizontal overflow recorded.
Harness screenshot of motion-primitives-transition-panel at 1440 pixels wide
Harness screenshot at 1440 pixels wide. No horizontal overflow recorded.

Measured

Every value below was written by the harness on the run that produced the frames above. None of it is derived from the prose.

Harness measurements recorded for motion-primitives-transition-panel
BuildOK
MountOK
Console errors0
Uncaught page errors0
Horizontal overflowclean at 375, 768, 1440
Axe critical0
Axe serious0
Axe moderate0
Axe minor0
Gzip marginal67.8 KB (133.2 KB build, 65.4 KB baseline)
Bare modeFAIL
Provider requiredNO
Demo usedwritten from the component source API

What the harness recorded

BARE BUILD

✗ Build failed in 30.11s
error during build:
[vite:load-fallback] Could not load <sandbox>/src/lib/utils (imported by src/cut/transition-panel.tsx): ENOENT: no such file or directory, open '<sandbox>/src/lib/utils'

Verdict

A concise, flexible primitive for teams already using Motion, and the configured harness builds and mounts cleanly. The supplied demo does not meaningfully exercise its required state. It needs a shadcn-style setup before it works in a bare project.

Use it if

  • You already track an active panel index and want animated transitions between fixed React views.
  • Your app already uses Motion and can share its animation dependency.
  • You need custom enter, center, and exit variants while keeping panel rendering under your control.

Skip it if

  • You need a complete tabs, carousel, or stepper widget with controls, keyboard behavior, and semantic markup.
  • You want to avoid the noticeable bundle cost of adding Motion for a single transition.
  • Your content is not naturally represented as an indexed array of React children.
  • You need a drop-in demo whose supplied usage visibly exercises the component.

Install

Installation record for motion-primitives-transition-panel
Declared dependenciesmotion
Missing on installnone
Bare installfails once the shadcn-style helpers are removed, so it needs that setup
Providerno provider required in the harness

In a non-shadcn project, install Motion, add a cn class-merging helper, and configure the @ import alias or replace that import with a local relative path. Render it from a client-capable React module and supply the active index, child array, and animation variants.

Source and credit

This page is a review, not a copy. The component source lives with its author and this site does not republish it. Read the license before you use anything.

Author repository

github.com/ibelick/motion-primitives
License
MIT
Record published
2026-08-13

Alternatives

Other published entries for the transition-effect pattern, ordered by what they measured: mounts first, then clean axe scans, then bare-mode passes, then the smaller bundle.