feat(nx-dev): honor prefers-reduced-motion (#27541)

Disables animations when browser is set to `prefers-reduced-motion`

Fixes #27114

nx-dev/ui-animations/src/index.ts

@@ -3,4 +3,5 @@ export * from './lib/blur-fade';
 export * from './lib/fit-text';
 export * from './lib/marquee';
 export * from './lib/moving-border';
+export * from './lib/prefers-reduced-motion';
 export * from './lib/shine-border';

nx-dev/ui-animations/src/lib/animate-value.tsx

@@ -1,5 +1,6 @@
 import { animate, useInView } from 'framer-motion';
 import { useEffect, useRef, useState } from 'react';
+import { usePrefersReducedMotion } from './prefers-reduced-motion';
 
 /**
  * Animates a value and renders it with a specified suffix.
@@ -26,13 +27,14 @@ export function AnimateValue({
   const ref = useRef<HTMLSpanElement | null>(null);
   const [isComplete, setIsComplete] = useState<boolean>(false);
   const isInView = useInView(ref);
+  const shouldReduceMotion = usePrefersReducedMotion();
 
   useEffect(() => {
     if (!isInView) return;
     if (isComplete && once) return;
 
     animate(0, num, {
-      duration: 2.5,
+      duration: shouldReduceMotion ? 0 : 2.5,
       onUpdate(value) {
         if (!ref.current) return;
 

nx-dev/ui-animations/src/lib/blur-fade.tsx

@@ -7,6 +7,7 @@ import {
   Variants,
 } from 'framer-motion';
 import { ReactNode, useRef } from 'react';
+import { usePrefersReducedMotion } from './prefers-reduced-motion';
 
 interface BlurFadeProps {
   children: ReactNode;
@@ -62,6 +63,12 @@ export function BlurFade({
     visible: { y: -yOffset, opacity: 1, filter: `blur(0px)` },
   };
   const combinedVariants = variant || defaultVariants;
+
+  const shouldReduceMotion = usePrefersReducedMotion();
+  if (shouldReduceMotion) {
+    return;
+  }
+
   return (
     <AnimatePresence>
       <motion.div

nx-dev/ui-animations/src/lib/marquee.tsx

@@ -1,4 +1,5 @@
 import { cx } from '@nx/nx-dev/ui-primitives';
+import { usePrefersReducedMotion } from './prefers-reduced-motion';
 
 interface MarqueeProps {
   className?: string;
@@ -33,6 +34,8 @@ export function Marquee({
   repeat = 4,
   ...props
 }: MarqueeProps) {
+  const shouldReduceMotion = usePrefersReducedMotion();
+
   return (
     <div
       {...props}
@@ -53,6 +56,7 @@ export function Marquee({
             className={cx('flex shrink-0 justify-around [gap:var(--gap)]', {
               'animate-marquee flex-row': !vertical,
               'animate-marquee-vertical flex-col': vertical,
+              '[animation-play-state:paused]': shouldReduceMotion,
               'group-hover:[animation-play-state:paused]': pauseOnHover,
               '[animation-direction:reverse]': reverse,
             })}

nx-dev/ui-animations/src/lib/moving-border.tsx

@@ -6,6 +6,7 @@ import {
   useTransform,
 } from 'framer-motion';
 import { ReactNode, useRef } from 'react';
+import { usePrefersReducedMotion } from './prefers-reduced-motion';
 
 /**
  * Creates a moving border effect around the specified component by animating a rectangular SVG element.
@@ -54,6 +55,11 @@ export function MovingBorder({
 
   const transform = useMotionTemplate`translateX(${x}px) translateY(${y}px) translateX(-50%) translateY(-50%)`;
 
+  const shouldReduceMotion = usePrefersReducedMotion();
+  if (shouldReduceMotion) {
+    return;
+  }
+
   return (
     <>
       <svg

nx-dev/ui-animations/src/lib/prefers-reduced-motion.tsx

@@ -0,0 +1,23 @@
+import { useState, useEffect } from 'react';
+
+const QUERY = '(prefers-reduced-motion: no-preference)';
+
+export function usePrefersReducedMotion(): boolean {
+  // Default to no-animations, since we don't know what the
+  // user's preference is on the server.
+  const [prefersReducedMotion, setPrefersReducedMotion] = useState(true);
+  useEffect(() => {
+    const mediaQueryList = window.matchMedia(QUERY);
+    // Set the true initial value, now that we're on the client:
+    setPrefersReducedMotion(!window.matchMedia(QUERY).matches);
+    // Register our event listener
+    const listener = (event: any) => {
+      setPrefersReducedMotion(!event.matches);
+    };
+    mediaQueryList.addEventListener('change', listener);
+    return () => {
+      mediaQueryList.removeEventListener('change', listener);
+    };
+  }, []);
+  return prefersReducedMotion;
+}

nx-dev/ui-cloud/src/lib/agent-number-over-time.tsx

@@ -1,4 +1,5 @@
 'use client';
+import { usePrefersReducedMotion } from '@nx/nx-dev/ui-animations';
 import { SectionHeading } from '@nx/nx-dev/ui-common';
 import { motion } from 'framer-motion';
 import { useEffect, useState } from 'react';
@@ -48,6 +49,7 @@ export function AgentNumberOverTime(): JSX.Element {
   // Calculate the width of each item
   const itemWidthPercent = remainingPercent / agents.length;
 
+  const shouldReduceMotion = usePrefersReducedMotion();
   const variants = {
     hidden: {
       opacity: 0,
@@ -58,7 +60,7 @@ export function AgentNumberOverTime(): JSX.Element {
     visible: (i: number) => ({
       opacity: 1,
       transition: {
-        delay: i || 0,
+        delay: shouldReduceMotion ? 0 : i || 0,
       },
     }),
   };
@@ -67,8 +69,8 @@ export function AgentNumberOverTime(): JSX.Element {
       opacity: 1,
       y: 0,
       transition: {
-        delay: i * 0.035,
+        delay: shouldReduceMotion ? 0 : i * 0.035,
-        duration: 0.65,
+        duration: shouldReduceMotion ? 0 : 0.65,
         ease: 'easeOut',
         when: 'beforeChildren',
         staggerChildren: 0.3,

nx-dev/ui-cloud/src/lib/automated-agents-management.tsx

@@ -8,8 +8,10 @@ import {
 import { SectionHeading } from '@nx/nx-dev/ui-common';
 import { motion } from 'framer-motion';
 import { NxCloudIcon } from '@nx/nx-dev/ui-icons';
+import { usePrefersReducedMotion } from '@nx/nx-dev/ui-animations';
 
 export function AutomatedAgentsManagement(): JSX.Element {
+  const shouldReduceMotion = usePrefersReducedMotion();
   const variants = {
     hidden: {
       opacity: 0,
@@ -20,7 +22,7 @@ export function AutomatedAgentsManagement(): JSX.Element {
     visible: (i: number) => ({
       opacity: 1,
       transition: {
-        delay: i || 0,
+        delay: shouldReduceMotion ? 0 : i || 0,
       },
     }),
   };
@@ -29,8 +31,8 @@ export function AutomatedAgentsManagement(): JSX.Element {
       opacity: 1,
       y: 0,
       transition: {
-        delay: i * 0.035,
+        delay: shouldReduceMotion ? 0 : i * 0.035,
-        duration: 0.65,
+        duration: shouldReduceMotion ? 0 : 0.65,
         ease: 'easeOut',
         when: 'beforeChildren',
         staggerChildren: 0.3,

nx-dev/ui-cloud/src/lib/statistics.tsx

@@ -2,6 +2,7 @@
 import { motion } from 'framer-motion';
 import { useEffect, useState } from 'react';
 import { SectionHeading } from '@nx/nx-dev/ui-common';
+import { usePrefersReducedMotion } from '@nx/nx-dev/ui-animations';
 
 /**
  * Calculate the total number of years worth of compute.
@@ -71,6 +72,8 @@ const stats = [
 ];
 
 export function Statistics(): JSX.Element {
+  const shouldReduceMotion = usePrefersReducedMotion();
+
   const variants = {
     hidden: {
       opacity: 0,
@@ -81,7 +84,7 @@ export function Statistics(): JSX.Element {
     visible: (i: number) => ({
       opacity: 1,
       transition: {
-        delay: i || 0,
+        delay: shouldReduceMotion ? 0 : i || 0,
       },
     }),
   };
@@ -90,8 +93,8 @@ export function Statistics(): JSX.Element {
       opacity: 1,
       y: 0,
       transition: {
-        delay: i * 0.25,
+        delay: shouldReduceMotion ? 0 : i * 0.25,
-        duration: 0.65,
+        duration: shouldReduceMotion ? 0 : 0.65,
         ease: 'easeOut',
         when: 'beforeChildren',
         staggerChildren: 0.3,

nx-dev/ui-cloud/src/lib/understand-workspace.tsx

@@ -14,6 +14,7 @@ import { BentoGrid, BentoGridItem } from './elements/bento-grid';
 import { cx } from '@nx/nx-dev/ui-primitives';
 import { animate, motion, useMotionValue, useTransform } from 'framer-motion';
 import { useEffect } from 'react';
+import { usePrefersReducedMotion } from '@nx/nx-dev/ui-animations';
 
 export function UnderstandWorkspace(): JSX.Element {
   return (
@@ -155,6 +156,7 @@ const Caching = () => {
 };
 
 const FlakyTasks = () => {
+  const shouldReduceMotion = usePrefersReducedMotion();
   const variants = {
     hidden: {
       opacity: 0,
@@ -171,8 +173,8 @@ const FlakyTasks = () => {
       opacity: 1,
       x: 0,
       transition: {
-        delay: i * 0.2,
+        delay: shouldReduceMotion ? 0 : i * 0.2,
-        duration: 0.275,
+        duration: shouldReduceMotion ? 0 : 0.275,
         ease: 'easeOut',
         when: 'beforeChildren',
         staggerChildren: 0.3,
@@ -439,6 +441,7 @@ const SplitE2eTests = () => {
 };
 
 const TaskDistribution = () => {
+  const shouldReduceMotion = usePrefersReducedMotion();
   const variants = {
     hidden: {
       opacity: 0,
@@ -455,8 +458,8 @@ const TaskDistribution = () => {
       opacity: 1,
       x: 0,
       transition: {
-        delay: i * 0.2,
+        delay: shouldReduceMotion ? 0 : i * 0.2,
-        duration: 0.275,
+        duration: shouldReduceMotion ? 0 : 0.275,
         ease: 'easeOut',
         when: 'beforeChildren',
         staggerChildren: 0.3,
@@ -745,6 +748,10 @@ export function Counter({
 }) {
   const count = useMotionValue(0);
   const rounded = useTransform(count, Math.round);
+  const shouldReduceMotion = usePrefersReducedMotion();
+  if (shouldReduceMotion) {
+    duration = 0;
+  }
 
   useEffect(() => {
     const animation = animate(count, value, {