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Base Alert animation preview

Base Alert animation preview

This preview uses fictional demo content. See the props below for the customization options available in this component.

npx nativeanimation add base-alert

Base Alert

React Native Alert Component

An inline alert with an animated entrance and collapsing dismissal, configurable tone, icon, title, description, action, and theme.

Native Animation Base · Free · MIT

Read and download source

Add to your project

Copy the component and its assets into your app with the Native Animation CLI, or paste the agent prompt into Claude Code, Codex or Cursor once the MCP server is connected.

About this component

An inline alert with an animated entrance and collapsing dismissal, configurable tone, icon, title, description, action, and theme.

How it works

A card-colored surface uses a 1 px border, large radius, 16 pt horizontal and 12 pt vertical padding.
Content enters from −6 pt with a 300 ms fade. Destructive descriptions use 90% of the destructive text color.
Dismissal fades for 200 ms, then collapses the measured height over 280 ms before calling onDismiss.
Set visible to hide or show the alert. After an internal dismissal, toggle it off and on or remount to show it again. Keep it mounted until the callback finishes.

Install

npx nativeanimation add base-alert

The CLI also copies the family modules listed in registryDependencies. Dependencies, if you copy by hand:

npx expo install lucide-react-native react-native-svg react-native-gesture-handler react-native-reanimated react-native-worklets

Usage

import { AlertCircle } from 'lucide-react-native';
import { BaseAlert } from './base-alert';
import { BaseButton } from './base-button';

<BaseAlert
  visible={visible}
  variant="destructive"
  icon={<AlertCircle size={16} color={theme.colors.destructive} />}
  title="Could not sync"
  description="Your changes are safe on this device."
  action={<BaseButton onPress={retry}>Try again</BaseButton>}
  onDismiss={() => setVisible(false)}
/>

Wrap your app in BaseThemeProvider (from base-theme) to choose light/dark and an accent; without it, pieces use the light neutral theme. Every piece also takes a theme prop that wins over the provider.

Props

Prop	Type	Default	Description
`variant`	`'default' \| 'destructive'`	`default`	Text tone; supply an icon in the matching theme color.
`icon`	`ReactNode`	—	Leading 16 pt icon; offset 2 pt downward.
`title`	`string`	—	Required single-line title.
`description`	`string`	—	Supporting message.
`action`	`ReactNode`	—	Optional action below the message.
`onDismiss`	`() => void`	—	Enables the close button; called after a completed exit, including visible=false.
`visible`	`boolean`	`true`	Controls visibility with an animated exit.
`dismissLabel`	`string`	`Dismiss alert`	Accessible close button label.
`theme`	`BaseTheme`	`provider`	Overrides the theme from BaseThemeProvider.
`style`	`StyleProp<ViewStyle>`	—	Container style.
`testID`	`string`	—	Stable identifier on the root view.

Compatibility

Expo SDK 58 · React Native 0.88 · Reanimated 4.7 · react-native-worklets 0.13. Runs on iOS, Android and web, in Expo Go and in development builds. Part of Native Animation Base, a free family that shares one theme: install base-theme once (the CLI does it for you) and every Base piece picks it up. Free forever. MIT.

Accessibility

Destructive alerts use the alert role; updates use a polite live region. The close button supports touch, screen reader activation, and Enter/Space. Its 44 pt target has Android hit slop to reach 48 dp. With Reduce Motion on, all entrance and dismissal changes are immediate. Caller-supplied icons should use 16 pt and the matching foreground or destructive theme color.

Part of a shared foundation

Use it in a screen

Compose Base Alert with other Base components and a single shared theme. Ask your agent to read each API, then connect real navigation, state, and callbacks.

Build a habit tracker Build with an agent CLI and manual installation Theme and dark mode Accessibility checklist Native Animation Base UI library

Go further.

Base covers the everyday. Choose a more expressive interaction when your app calls for it.

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Source code

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Dependencies

Package	Version
lucide-react-native	^1.61.0
react-native-gesture-handler	~3.3.0
react-native-reanimated	4.7.1
react-native-svg	15.16.0
react-native-worklets	0.13.0

Compatibility

SDK	Status	Revision	Last revision	Platforms	Dependencies
Expo SDK 58	Tested	2	10/28/2026	iOS, Web, Android	lucide-react-native ^1.61.0, react-native-gesture-handler ~3.3.0, react-native-reanimated 4.7.1, react-native-svg 15.16.0, react-native-worklets 0.13.0
Expo SDK 57	Tested	1	10/27/2026	iOS, Web, Android	lucide-react-native ^1.61.0, react-native-gesture-handler ~2.32.0, react-native-reanimated 4.5.1, react-native-svg 15.15.4, react-native-worklets 0.10.1

Scroll the table horizontally to review every column ↔

More animations

BaseAlert.tsx

import {
  baseActivationProps,
  useBaseReducedMotion,
  alpha,
  BaseThemeProvider,
  spring,
  timing,
  useBaseTheme,
  type BaseTheme,
} from '../base-theme';
import React, { useCallback, useEffect, useRef, useState } from 'react';
import {
  Platform,
  Text,
  View,
  type StyleProp,
  type ViewStyle,
} from 'react-native';
import X from 'lucide-react-native/icons/x';
import { Gesture, GestureDetector } from 'react-native-gesture-handler';
import Animated, {
  cancelAnimation,
  useAnimatedStyle,
  useSharedValue,
  withSpring,
  withTiming,
} from 'react-native-reanimated';
import { scheduleOnRN } from 'react-native-worklets';

const NO_WEB_OUTLINE =
  Platform.OS === 'web' ? ({ outlineStyle: 'none' } as object) : null;

export type BaseAlertProps = {
  variant?: 'default' | 'destructive';
  icon?: React.ReactNode;
  title: string;
  description?: string;
  action?: React.ReactNode;
  onDismiss?: () => void;
  visible?: boolean;
  dismissLabel?: string;
  theme?: BaseTheme;
  style?: StyleProp<ViewStyle>;
  testID?: string;
};

export function BaseAlert({
  variant = 'default',
  icon,
  title,
  description,
  action,
  onDismiss,
  visible = true,
  dismissLabel = 'Dismiss alert',
  theme: override,
  style,
  testID,
}: BaseAlertProps) {
  const theme = useBaseTheme(override);
  const reduced = useBaseReducedMotion();
  const [mounted, setMounted] = useState(visible);
  const [closing, setClosing] = useState(false);
  const opacity = useSharedValue(0);
  const shift = useSharedValue(reduced ? 0 : -theme.motion.shifts.handoff);
  const measured = useSharedValue(0);
  const height = useSharedValue(-1);
  const pressed = useSharedValue(1);
  const dismissCallback = useRef(onDismiss);
  useEffect(() => {
    dismissCallback.current = onDismiss;
  }, [onDismiss]);
  const finish = useCallback(() => {
    setMounted(false);
    dismissCallback.current?.();
  }, []);
  const [previousVisible, setPreviousVisible] = useState(visible);
  if (previousVisible !== visible) {
    setPreviousVisible(visible);
    if (visible) {
      setMounted(true);
      setClosing(false);
    } else setClosing(true);
  }
  useEffect(() => {
    if (!mounted) return;
    if (closing) {
      cancelAnimation(shift);
      opacity.set(
        withTiming(0, timing(theme, 'dismiss', reduced), (finished) => {
          if (!finished) return;
          height.set(measured.get());
          height.set(
            withTiming(0, timing(theme, 'collapse', reduced), (collapsed) => {
              if (collapsed) scheduleOnRN(finish);
            }),
          );
        }),
      );
    } else {
      height.set(-1);
      if (opacity.get() === 0)
        shift.set(reduced ? 0 : -theme.motion.shifts.handoff);
      shift.set(withTiming(0, timing(theme, 'reveal', reduced)));
      opacity.set(withTiming(1, timing(theme, 'reveal', reduced)));
    }
    return () => {
      cancelAnimation(opacity);
      cancelAnimation(height);
      cancelAnimation(shift);
    };
  }, [
    closing,
    mounted,
    reduced,
    theme,
    opacity,
    height,
    measured,
    shift,
    finish,
  ]);
  const requestDismiss = () => {
    if (!closing) setClosing(true);
  };
  const tap = Gesture.Tap()
    .enabled(!!onDismiss && !closing)
    .onBegin(() => {
      pressed.set(
        reduced
          ? 1
          : withSpring(theme.motion.scales.press, spring(theme, 'press')),
      );
    })
    .onFinalize(() => {
      pressed.set(reduced ? 1 : withSpring(1, spring(theme, 'press')));
    })
    .onEnd((_event, success) => {
      if (success) scheduleOnRN(requestDismiss);
    });
  const clipStyle = useAnimatedStyle(() => ({
    height: height.get() < 0 ? 'auto' : height.get(),
  }));
  const entrance = useAnimatedStyle(() => ({
    opacity: opacity.get(),
    transform: [
      {
        translateY: reduced ? 0 : shift.get(),
      },
    ],
  }));
  const pressStyle = useAnimatedStyle(() => ({
    transform: [{ scale: pressed.get() }],
  }));
  const color =
    variant === 'destructive'
      ? theme.colors.destructive
      : theme.colors.cardForeground;
  if (!mounted) return null;
  return (
    <BaseThemeProvider theme={theme}>
      <Animated.View
        testID={testID}
        style={[{ overflow: 'hidden' }, style, clipStyle]}
        pointerEvents={closing ? 'none' : 'auto'}
        aria-hidden={closing}
        accessibilityElementsHidden={closing}
        importantForAccessibility={closing ? 'no-hide-descendants' : 'auto'}
      >
        <Animated.View
          accessibilityRole={variant === 'destructive' ? 'alert' : undefined}
          accessibilityLiveRegion="polite"
          onLayout={(event) => {
            measured.set(event.nativeEvent.layout.height);
          }}
          style={[
            {
              paddingHorizontal: 16,
              paddingVertical: 12,
              borderWidth: 1,
              borderColor: theme.colors.border,
              borderRadius: theme.radius.lg,
              backgroundColor: theme.colors.card,
              flexDirection: 'row',
              alignItems: 'flex-start',
              gap: 12,
            },
            entrance,
          ]}
        >
          {icon ? (
            <View aria-hidden style={{ width: 16, height: 16, marginTop: 2 }}>
              {icon}
            </View>
          ) : null}
          <View style={{ flex: 1, minWidth: 0, gap: 2 }}>
            <Text
              numberOfLines={1}
              style={{
                fontFamily: theme.fonts.medium,
                fontSize: 14,
                lineHeight: 20,
                letterSpacing: -0.35,
                color,
              }}
            >
              {title}
            </Text>
            {description ? (
              <Text
                style={{
                  fontFamily: theme.fonts.regular,
                  fontSize: 14,
                  lineHeight: 14 * 1.625,
                  color:
                    variant === 'destructive'
                      ? alpha(color, 0.9)
                      : theme.colors.mutedForeground,
                }}
              >
                {description}
              </Text>
            ) : null}
            {action ? (
              <View
                style={{
                  paddingTop: theme.space[2],
                  alignSelf: 'flex-start',
                  maxWidth: '100%',
                }}
              >
                {action}
              </View>
            ) : null}
          </View>
          {onDismiss ? (
            <GestureDetector gesture={tap}>
              <Animated.View
                testID={testID ? `${testID}-dismiss` : undefined}
                accessible
                accessibilityRole="button"
                accessibilityLabel={dismissLabel}

                {
                  /* RN Web forwards DOM events rather than native event objects. */
                  ...((Platform.OS === 'web'
                    ? {
                        tabIndex: closing ? -1 : 0,
                        // Gesture Handler activates on key-up; prevent browser scrolling without firing twice.
                        onKeyDown: (event: React.KeyboardEvent) => {
                          if (event.key === 'Enter' || event.key === ' ') {
                            event.preventDefault();
                          }
                        },
                      }
                    : {}) as object)
                }
                {
                  /* RN Web forwards DOM events rather than native event objects. */
                  ...(baseActivationProps(requestDismiss, closing) as object)
                }
                style={[
                  {
                    width: Platform.OS === 'android' ? 48 : 44,
                    height: Platform.OS === 'android' ? 48 : 44,
                    marginTop: Platform.OS === 'android' ? -10 : -8,
                    marginBottom: Platform.OS === 'android' ? -2 : 0,
                    marginLeft: Platform.OS === 'android' ? -2 : 0,
                    marginRight: Platform.OS === 'android' ? -14 : -12,
                    alignItems: 'center',
                    justifyContent: 'center',
                    borderRadius: theme.radius.md,
                  },
                  NO_WEB_OUTLINE,
                  pressStyle,
                ]}
              >
                <X size={16} color={color} />
              </Animated.View>
            </GestureDetector>
          ) : null}
        </Animated.View>
      </Animated.View>
    </BaseThemeProvider>
  );
}

LICENSE

MIT License

Copyright (c) 2026 Native Animation

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

nativeanimation.manifest.json

{
  "schemaVersion": 1,
  "id": "base-alert",
  "family": "base",
  "license": "MIT",
  "kind": "component",
  "registryDependencies": [
    "base-theme",
    "base-button"
  ],
  "dependencies": {
    "lucide-react-native": "^1.61.0",
    "react-native-gesture-handler": "~3.3.0",
    "react-native-reanimated": "4.7.1",
    "react-native-svg": "15.16.0",
    "react-native-worklets": "0.13.0"
  }
}