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{"version":3,"sources":["../package.json","../packages/core/src/maths.ts","../packages/core/src/animate.ts","../packages/core/src/debounce.ts","../packages/core/src/dimensions.ts","../packages/core/src/emitter.ts","../packages/core/src/virtual-scroll.ts","../packages/core/src/lenis.ts"],"sourcesContent":["{\n \"name\": \"lenis\",\n \"version\": \"1.3.14\",\n \"description\": \"How smooth scroll should be\",\n \"type\": \"module\",\n \"sideEffects\": false,\n \"author\": \"darkroom.engineering\",\n \"license\": \"MIT\",\n \"repository\": {\n \"type\": \"git\",\n \"url\": \"git+https://github.com/darkroomengineering/lenis.git\"\n },\n \"bugs\": {\n \"url\": \"https://github.com/darkroomengineering/lenis/issues\"\n },\n \"homepage\": \"https://github.com/darkroomengineering/lenis\",\n \"funding\": {\n \"type\": \"github\",\n \"url\": \"https://github.com/sponsors/darkroomengineering\"\n },\n \"keywords\": [\n \"scroll\",\n \"smooth\",\n \"lenis\",\n \"react\",\n \"vue\"\n ],\n \"scripts\": {\n \"build\": \"pnpm build:core && pnpm build:all\",\n \"build:core\": \"tsup --config tsup.core.ts\",\n \"build:all\": \"tsup\",\n \"dev\": \"pnpm run -w --parallel /^dev:.*/\",\n \"dev:build\": \"tsup --watch\",\n \"dev:playground\": \"pnpm --filter playground dev\",\n \"dev:nuxt\": \"pnpm --filter playground-nuxt dev\",\n \"readme\": \"node ./scripts/update-readme.js\",\n \"version:dev\": \"npm version prerelease --preid dev --force --no-git-tag-version\",\n \"version:patch\": \"npm version patch --force --no-git-tag-version\",\n \"version:minor\": \"npm version minor --force --no-git-tag-version\",\n \"version:major\": \"npm version major --force --no-git-tag-version\",\n \"postversion\": \"pnpm build && pnpm readme\",\n \"publish:dev\": \"npm publish --tag dev\",\n \"publish:main\": \"npm publish\"\n },\n \"files\": [\n \"dist\"\n ],\n \"devDependencies\": {\n \"terser\": \"^5.37.0\",\n \"tsup\": \"^8.3.5\",\n \"typescript\": \"^5.7.3\"\n },\n \"peerDependencies\": {\n \"react\": \">=17.0.0\",\n \"vue\": \">=3.0.0\",\n \"@nuxt/kit\": \">=3.0.0\"\n },\n \"peerDependenciesMeta\": {\n \"react\": {\n \"optional\": true\n },\n \"vue\": {\n \"optional\": true\n },\n \"@nuxt/kit\": {\n \"optional\": true\n }\n },\n \"unpkg\": \"./dist/lenis.mjs\",\n \"main\": \"./dist/lenis.mjs\",\n \"module\": \"./dist/lenis.mjs\",\n \"types\": \"./dist/lenis.d.ts\",\n \"exports\": {\n \".\": {\n \"types\": \"./dist/lenis.d.ts\",\n \"default\": \"./dist/lenis.mjs\"\n },\n \"./react\": {\n \"types\": \"./dist/lenis-react.d.ts\",\n \"default\": \"./dist/lenis-react.mjs\"\n },\n \"./snap\": {\n \"types\": \"./dist/lenis-snap.d.ts\",\n \"default\": \"./dist/lenis-snap.mjs\"\n },\n \"./vue\": {\n \"types\": \"./dist/lenis-vue.d.ts\",\n \"default\": \"./dist/lenis-vue.mjs\"\n },\n \"./nuxt\": {\n \"default\": \"./dist/lenis-vue-nuxt.mjs\"\n },\n \"./nuxt/runtime/*\": {\n \"default\": \"./dist/nuxt/runtime/*.mjs\"\n },\n \"./dist/*\": \"./dist/*\"\n }\n}\n","/**\r\n * Clamp a value between a minimum and maximum value\r\n *\r\n * @param min Minimum value\r\n * @param input Value to clamp\r\n * @param max Maximum value\r\n * @returns Clamped value\r\n */\r\nexport function clamp(min: number, input: number, max: number) {\r\n return Math.max(min, Math.min(input, max))\r\n}\r\n\r\n/**\r\n * Truncate a floating-point number to a specified number of decimal places\r\n *\r\n * @param value Value to truncate\r\n * @param decimals Number of decimal places to truncate to\r\n * @returns Truncated value\r\n */\r\nexport function truncate(value: number, decimals = 0) {\r\n return parseFloat(value.toFixed(decimals))\r\n}\r\n\r\n/**\r\n * Linearly interpolate between two values using an amount (0 <= t <= 1)\r\n *\r\n * @param x First value\r\n * @param y Second value\r\n * @param t Amount to interpolate (0 <= t <= 1)\r\n * @returns Interpolated value\r\n */\r\nexport function lerp(x: number, y: number, t: number) {\r\n return (1 - t) * x + t * y\r\n}\r\n\r\n/**\r\n * Damp a value over time using a damping factor\r\n * {@link http://www.rorydriscoll.com/2016/03/07/frame-rate-independent-damping-using-lerp/}\r\n *\r\n * @param x Initial value\r\n * @param y Target value\r\n * @param lambda Damping factor\r\n * @param dt Time elapsed since the last update\r\n * @returns Damped value\r\n */\r\nexport function damp(x: number, y: number, lambda: number, deltaTime: number) {\r\n return lerp(x, y, 1 - Math.exp(-lambda * deltaTime))\r\n}\r\n\r\n/**\r\n * Calculate the modulo of the dividend and divisor while keeping the result within the same sign as the divisor\r\n * {@link https://anguscroll.com/just/just-modulo}\r\n *\r\n * @param n Dividend\r\n * @param d Divisor\r\n * @returns Modulo\r\n */\r\nexport function modulo(n: number, d: number) {\r\n return ((n % d) + d) % d\r\n}\r\n","import { clamp, damp } from './maths'\r\nimport type { EasingFunction, FromToOptions, OnUpdateCallback } from './types'\r\n\r\n/**\r\n * Animate class to handle value animations with lerping or easing\r\n *\r\n * @example\r\n * const animate = new Animate()\r\n * animate.fromTo(0, 100, { duration: 1, easing: (t) => t })\r\n * animate.advance(0.5) // 50\r\n */\r\nexport class Animate {\r\n isRunning = false\r\n value = 0\r\n from = 0\r\n to = 0\r\n currentTime = 0\r\n\r\n // These are instanciated in the fromTo method\r\n lerp?: number\r\n duration?: number\r\n easing?: EasingFunction\r\n onUpdate?: OnUpdateCallback\r\n\r\n /**\r\n * Advance the animation by the given delta time\r\n *\r\n * @param deltaTime - The time in seconds to advance the animation\r\n */\r\n advance(deltaTime: number) {\r\n if (!this.isRunning) return\r\n\r\n let completed = false\r\n\r\n if (this.duration && this.easing) {\r\n this.currentTime += deltaTime\r\n const linearProgress = clamp(0, this.currentTime / this.duration, 1)\r\n\r\n completed = linearProgress >= 1\r\n const easedProgress = completed ? 1 : this.easing(linearProgress)\r\n this.value = this.from + (this.to - this.from) * easedProgress\r\n } else if (this.lerp) {\r\n this.value = damp(this.value, this.to, this.lerp * 60, deltaTime)\r\n if (Math.round(this.value) === this.to) {\r\n this.value = this.to\r\n completed = true\r\n }\r\n } else {\r\n // If no easing or lerp, just jump to the end value\r\n this.value = this.to\r\n completed = true\r\n }\r\n\r\n if (completed) {\r\n this.stop()\r\n }\r\n\r\n // Call the onUpdate callback with the current value and completed status\r\n this.onUpdate?.(this.value, completed)\r\n }\r\n\r\n /** Stop the animation */\r\n stop() {\r\n this.isRunning = false\r\n }\r\n\r\n /**\r\n * Set up the animation from a starting value to an ending value\r\n * with optional parameters for lerping, duration, easing, and onUpdate callback\r\n *\r\n * @param from - The starting value\r\n * @param to - The ending value\r\n * @param options - Options for the animation\r\n */\r\n fromTo(\r\n from: number,\r\n to: number,\r\n { lerp, duration, easing, onStart, onUpdate }: FromToOptions\r\n ) {\r\n this.from = this.value = from\r\n this.to = to\r\n this.lerp = lerp\r\n this.duration = duration\r\n this.easing = easing\r\n this.currentTime = 0\r\n this.isRunning = true\r\n\r\n onStart?.()\r\n this.onUpdate = onUpdate\r\n }\r\n}\r\n","export function debounce<CB extends (...args: any[]) => void>(\r\n callback: CB,\r\n delay: number\r\n) {\r\n let timer: number | undefined\r\n return function <T>(this: T, ...args: Parameters<typeof callback>) {\r\n let context = this\r\n clearTimeout(timer)\r\n timer = setTimeout(() => {\r\n timer = undefined\r\n callback.apply(context, args)\r\n }, delay)\r\n }\r\n}\r\n","import { debounce } from './debounce'\r\n\r\n/**\r\n * Dimensions class to handle the size of the content and wrapper\r\n *\r\n * @example\r\n * const dimensions = new Dimensions(wrapper, content)\r\n * dimensions.on('resize', (e) => {\r\n * console.log(e.width, e.height)\r\n * })\r\n */\r\nexport class Dimensions {\r\n width = 0\r\n height = 0\r\n scrollHeight = 0\r\n scrollWidth = 0\r\n\r\n // These are instanciated in the constructor as they need information from the options\r\n private debouncedResize?: (...args: unknown[]) => void\r\n private wrapperResizeObserver?: ResizeObserver\r\n private contentResizeObserver?: ResizeObserver\r\n\r\n constructor(\r\n private wrapper: HTMLElement | Window | Element,\r\n private content: HTMLElement | Element,\r\n { autoResize = true, debounce: debounceValue = 250 } = {}\r\n ) {\r\n if (autoResize) {\r\n this.debouncedResize = debounce(this.resize, debounceValue)\r\n\r\n if (this.wrapper instanceof Window) {\r\n window.addEventListener('resize', this.debouncedResize, false)\r\n } else {\r\n this.wrapperResizeObserver = new ResizeObserver(this.debouncedResize)\r\n this.wrapperResizeObserver.observe(this.wrapper)\r\n }\r\n\r\n this.contentResizeObserver = new ResizeObserver(this.debouncedResize)\r\n this.contentResizeObserver.observe(this.content)\r\n }\r\n\r\n this.resize()\r\n }\r\n\r\n destroy() {\r\n this.wrapperResizeObserver?.disconnect()\r\n this.contentResizeObserver?.disconnect()\r\n\r\n if (this.wrapper === window && this.debouncedResize) {\r\n window.removeEventListener('resize', this.debouncedResize, false)\r\n }\r\n }\r\n\r\n resize = () => {\r\n this.onWrapperResize()\r\n this.onContentResize()\r\n }\r\n\r\n onWrapperResize = () => {\r\n if (this.wrapper instanceof Window) {\r\n this.width = window.innerWidth\r\n this.height = window.innerHeight\r\n } else {\r\n this.width = this.wrapper.clientWidth\r\n this.height = this.wrapper.clientHeight\r\n }\r\n }\r\n\r\n onContentResize = () => {\r\n if (this.wrapper instanceof Window) {\r\n this.scrollHeight = this.content.scrollHeight\r\n this.scrollWidth = this.content.scrollWidth\r\n } else {\r\n this.scrollHeight = this.wrapper.scrollHeight\r\n this.scrollWidth = this.wrapper.scrollWidth\r\n }\r\n }\r\n\r\n get limit() {\r\n return {\r\n x: this.scrollWidth - this.width,\r\n y: this.scrollHeight - this.height,\r\n }\r\n }\r\n}\r\n","/**\r\n * Emitter class to handle events\r\n * @example\r\n * const emitter = new Emitter()\r\n * emitter.on('event', (data) => {\r\n * console.log(data)\r\n * })\r\n * emitter.emit('event', 'data')\r\n */\r\nexport class Emitter {\r\n private events: Record<\r\n string,\r\n Array<(...args: unknown[]) => void> | undefined\r\n > = {}\r\n\r\n /**\r\n * Emit an event with the given data\r\n * @param event Event name\r\n * @param args Data to pass to the event handlers\r\n */\r\n emit(event: string, ...args: unknown[]) {\r\n let callbacks = this.events[event] || []\r\n for (let i = 0, length = callbacks.length; i < length; i++) {\r\n callbacks[i]?.(...args)\r\n }\r\n }\r\n\r\n /**\r\n * Add a callback to the event\r\n * @param event Event name\r\n * @param cb Callback function\r\n * @returns Unsubscribe function\r\n */\r\n on<CB extends (...args: any[]) => void>(event: string, cb: CB) {\r\n // Add the callback to the event's callback list, or create a new list with the callback\r\n this.events[event]?.push(cb) || (this.events[event] = [cb])\r\n\r\n // Return an unsubscribe function\r\n return () => {\r\n this.events[event] = this.events[event]?.filter((i) => cb !== i)\r\n }\r\n }\r\n\r\n /**\r\n * Remove a callback from the event\r\n * @param event Event name\r\n * @param callback Callback function\r\n */\r\n off<CB extends (...args: any[]) => void>(event: string, callback: CB) {\r\n this.events[event] = this.events[event]?.filter((i) => callback !== i)\r\n }\r\n\r\n /**\r\n * Remove all event listeners and clean up\r\n */\r\n destroy() {\r\n this.events = {}\r\n }\r\n}\r\n","import { Emitter } from './emitter'\r\nimport type { VirtualScrollCallback } from './types'\r\n\r\nconst LINE_HEIGHT = 100 / 6\r\nconst listenerOptions: AddEventListenerOptions = { passive: false }\r\n\r\nexport class VirtualScroll {\r\n touchStart = {\r\n x: 0,\r\n y: 0,\r\n }\r\n lastDelta = {\r\n x: 0,\r\n y: 0,\r\n }\r\n window = {\r\n width: 0,\r\n height: 0,\r\n }\r\n private emitter = new Emitter()\r\n\r\n constructor(\r\n private element: HTMLElement,\r\n private options = { wheelMultiplier: 1, touchMultiplier: 1 }\r\n ) {\r\n window.addEventListener('resize', this.onWindowResize, false)\r\n this.onWindowResize()\r\n\r\n this.element.addEventListener('wheel', this.onWheel, listenerOptions)\r\n this.element.addEventListener(\r\n 'touchstart',\r\n this.onTouchStart,\r\n listenerOptions\r\n )\r\n this.element.addEventListener(\r\n 'touchmove',\r\n this.onTouchMove,\r\n listenerOptions\r\n )\r\n this.element.addEventListener('touchend', this.onTouchEnd, listenerOptions)\r\n }\r\n\r\n /**\r\n * Add an event listener for the given event and callback\r\n *\r\n * @param event Event name\r\n * @param callback Callback function\r\n */\r\n on(event: string, callback: VirtualScrollCallback) {\r\n return this.emitter.on(event, callback)\r\n }\r\n\r\n /** Remove all event listeners and clean up */\r\n destroy() {\r\n this.emitter.destroy()\r\n\r\n window.removeEventListener('resize', this.onWindowResize, false)\r\n\r\n this.element.removeEventListener('wheel', this.onWheel, listenerOptions)\r\n this.element.removeEventListener(\r\n 'touchstart',\r\n this.onTouchStart,\r\n listenerOptions\r\n )\r\n this.element.removeEventListener(\r\n 'touchmove',\r\n this.onTouchMove,\r\n listenerOptions\r\n )\r\n this.element.removeEventListener(\r\n 'touchend',\r\n this.onTouchEnd,\r\n listenerOptions\r\n )\r\n }\r\n\r\n /**\r\n * Event handler for 'touchstart' event\r\n *\r\n * @param event Touch event\r\n */\r\n onTouchStart = (event: TouchEvent) => {\r\n // @ts-expect-error - event.targetTouches is not defined\r\n const { clientX, clientY } = event.targetTouches\r\n ? event.targetTouches[0]\r\n : event\r\n\r\n this.touchStart.x = clientX\r\n this.touchStart.y = clientY\r\n\r\n this.lastDelta = {\r\n x: 0,\r\n y: 0,\r\n }\r\n\r\n this.emitter.emit('scroll', {\r\n deltaX: 0,\r\n deltaY: 0,\r\n event,\r\n })\r\n }\r\n\r\n /** Event handler for 'touchmove' event */\r\n onTouchMove = (event: TouchEvent) => {\r\n // @ts-expect-error - event.targetTouches is not defined\r\n const { clientX, clientY } = event.targetTouches\r\n ? event.targetTouches[0]\r\n : event\r\n\r\n const deltaX = -(clientX - this.touchStart.x) * this.options.touchMultiplier\r\n const deltaY = -(clientY - this.touchStart.y) * this.options.touchMultiplier\r\n\r\n this.touchStart.x = clientX\r\n this.touchStart.y = clientY\r\n\r\n this.lastDelta = {\r\n x: deltaX,\r\n y: deltaY,\r\n }\r\n\r\n this.emitter.emit('scroll', {\r\n deltaX,\r\n deltaY,\r\n event,\r\n })\r\n }\r\n\r\n onTouchEnd = (event: TouchEvent) => {\r\n this.emitter.emit('scroll', {\r\n deltaX: this.lastDelta.x,\r\n deltaY: this.lastDelta.y,\r\n event,\r\n })\r\n }\r\n\r\n /** Event handler for 'wheel' event */\r\n onWheel = (event: WheelEvent) => {\r\n let { deltaX, deltaY, deltaMode } = event\r\n\r\n const multiplierX =\r\n deltaMode === 1 ? LINE_HEIGHT : deltaMode === 2 ? this.window.width : 1\r\n const multiplierY =\r\n deltaMode === 1 ? LINE_HEIGHT : deltaMode === 2 ? this.window.height : 1\r\n\r\n deltaX *= multiplierX\r\n deltaY *= multiplierY\r\n\r\n deltaX *= this.options.wheelMultiplier\r\n deltaY *= this.options.wheelMultiplier\r\n\r\n this.emitter.emit('scroll', { deltaX, deltaY, event })\r\n }\r\n\r\n onWindowResize = () => {\r\n this.window = {\r\n width: window.innerWidth,\r\n height: window.innerHeight,\r\n }\r\n }\r\n}\r\n","import { version } from '../../../package.json'\nimport { Animate } from './animate'\nimport { Dimensions } from './dimensions'\nimport { Emitter } from './emitter'\nimport { clamp, modulo } from './maths'\nimport type {\n LenisEvent,\n LenisOptions,\n ScrollCallback,\n Scrolling,\n ScrollToOptions,\n UserData,\n VirtualScrollCallback,\n VirtualScrollData,\n} from './types'\nimport { VirtualScroll } from './virtual-scroll'\n\n// Technical explanation\n// - listen to 'wheel' events\n// - prevent 'wheel' event to prevent scroll\n// - normalize wheel delta\n// - add delta to targetScroll\n// - animate scroll to targetScroll (smooth context)\n// - if animation is not running, listen to 'scroll' events (native context)\n\ntype OptionalPick<T, F extends keyof T> = Omit<T, F> & Partial<Pick<T, F>>\n\nconst defaultEasing = (t: number) => Math.min(1, 1.001 - Math.pow(2, -10 * t))\n\nexport class Lenis {\n private _isScrolling: Scrolling = false // true when scroll is animating\n private _isStopped = false // true if user should not be able to scroll - enable/disable programmatically\n private _isLocked = false // same as isStopped but enabled/disabled when scroll reaches target\n private _preventNextNativeScrollEvent = false\n private _resetVelocityTimeout: ReturnType<typeof setTimeout> | null = null\n private __rafID: number | null = null\n\n /**\n * Whether or not the user is touching the screen\n */\n isTouching?: boolean\n /**\n * The time in ms since the lenis instance was created\n */\n time = 0\n /**\n * User data that will be forwarded through the scroll event\n *\n * @example\n * lenis.scrollTo(100, {\n * userData: {\n * foo: 'bar'\n * }\n * })\n */\n userData: UserData = {}\n /**\n * The last velocity of the scroll\n */\n lastVelocity = 0\n /**\n * The current velocity of the scroll\n */\n velocity = 0\n /**\n * The direction of the scroll\n */\n direction: 1 | -1 | 0 = 0\n /**\n * The options passed to the lenis instance\n */\n options: OptionalPick<\n Required<LenisOptions>,\n 'duration' | 'easing' | 'prevent' | 'virtualScroll'\n >\n /**\n * The target scroll value\n */\n targetScroll: number\n /**\n * The animated scroll value\n */\n animatedScroll: number\n\n // These are instanciated here as they don't need information from the options\n private readonly animate = new Animate()\n private readonly emitter = new Emitter()\n // These are instanciated in the constructor as they need information from the options\n readonly dimensions: Dimensions // This is not private because it's used in the Snap class\n private readonly virtualScroll: VirtualScroll\n\n constructor({\n wrapper = window,\n content = document.documentElement,\n eventsTarget = wrapper,\n smoothWheel = true,\n syncTouch = false,\n syncTouchLerp = 0.075,\n touchInertiaExponent = 1.7,\n duration, // in seconds\n easing,\n lerp = 0.1,\n infinite = false,\n orientation = 'vertical', // vertical, horizontal\n gestureOrientation = orientation === 'horizontal' ? 'both' : 'vertical', // vertical, horizontal, both\n touchMultiplier = 1,\n wheelMultiplier = 1,\n autoResize = true,\n prevent,\n virtualScroll,\n overscroll = true,\n autoRaf = false,\n anchors = false,\n autoToggle = false, // https://caniuse.com/?search=transition-behavior\n allowNestedScroll = false,\n __experimental__naiveDimensions = false,\n }: LenisOptions = {}) {\n // Set version\n window.lenisVersion = version\n\n // Check if wrapper is <html>, fallback to window\n if (!wrapper || wrapper === document.documentElement) {\n wrapper = window\n }\n\n // flip to easing/time based animation if at least one of them is provided\n if (typeof duration === 'number' && typeof easing !== 'function') {\n easing = defaultEasing\n } else if (typeof easing === 'function' && typeof duration !== 'number') {\n duration = 1\n }\n\n // Setup options\n this.options = {\n wrapper,\n content,\n eventsTarget,\n smoothWheel,\n syncTouch,\n syncTouchLerp,\n touchInertiaExponent,\n duration,\n easing,\n lerp,\n infinite,\n gestureOrientation,\n orientation,\n touchMultiplier,\n wheelMultiplier,\n autoResize,\n prevent,\n virtualScroll,\n overscroll,\n autoRaf,\n anchors,\n autoToggle,\n allowNestedScroll,\n __experimental__naiveDimensions,\n }\n\n // Setup dimensions instance\n this.dimensions = new Dimensions(wrapper, content, { autoResize })\n\n // Setup class name\n this.updateClassName()\n\n // Set the initial scroll value for all scroll information\n this.targetScroll = this.animatedScroll = this.actualScroll\n\n // Add event listeners\n this.options.wrapper.addEventListener('scroll', this.onNativeScroll, false)\n\n this.options.wrapper.addEventListener('scrollend', this.onScrollEnd, {\n capture: true,\n })\n\n if (this.options.anchors && this.options.wrapper === window) {\n this.options.wrapper.addEventListener(\n 'click',\n this.onClick as EventListener,\n false\n )\n }\n\n this.options.wrapper.addEventListener(\n 'pointerdown',\n this.onPointerDown as EventListener,\n false\n )\n\n // Setup virtual scroll instance\n this.virtualScroll = new VirtualScroll(eventsTarget as HTMLElement, {\n touchMultiplier,\n wheelMultiplier,\n })\n this.virtualScroll.on('scroll', this.onVirtualScroll)\n\n if (this.options.autoToggle) {\n this.rootElement.addEventListener('transitionend', this.onTransitionEnd, {\n passive: true,\n })\n }\n\n if (this.options.autoRaf) {\n this.__rafID = requestAnimationFrame(this.raf)\n }\n }\n\n /**\n * Destroy the lenis instance, remove all event listeners and clean up the class name\n */\n destroy() {\n this.emitter.destroy()\n\n this.options.wrapper.removeEventListener(\n 'scroll',\n this.onNativeScroll,\n false\n )\n\n this.options.wrapper.removeEventListener('scrollend', this.onScrollEnd, {\n capture: true,\n })\n\n this.options.wrapper.removeEventListener(\n 'pointerdown',\n this.onPointerDown as EventListener,\n false\n )\n\n if (this.options.anchors && this.options.wrapper === window) {\n this.options.wrapper.removeEventListener(\n 'click',\n this.onClick as EventListener,\n false\n )\n }\n\n this.virtualScroll.destroy()\n this.dimensions.destroy()\n\n this.cleanUpClassName()\n\n if (this.__rafID) {\n cancelAnimationFrame(this.__rafID)\n }\n }\n\n /**\n * Add an event listener for the given event and callback\n *\n * @param event Event name\n * @param callback Callback function\n * @returns Unsubscribe function\n */\n on(event: 'scroll', callback: ScrollCallback): () => void\n on(event: 'virtual-scroll', callback: VirtualScrollCallback): () => void\n on(event: LenisEvent, callback: any) {\n return this.emitter.on(event, callback)\n }\n\n /**\n * Remove an event listener for the given event and callback\n *\n * @param event Event name\n * @param callback Callback function\n */\n off(event: 'scroll', callback: ScrollCallback): void\n off(event: 'virtual-scroll', callback: VirtualScrollCallback): void\n off(event: LenisEvent, callback: any) {\n return this.emitter.off(event, callback)\n }\n\n private onScrollEnd = (e: Event | CustomEvent) => {\n if (!(e instanceof CustomEvent)) {\n if (this.isScrolling === 'smooth' || this.isScrolling === false) {\n e.stopPropagation()\n }\n }\n }\n\n private dispatchScrollendEvent = () => {\n this.options.wrapper.dispatchEvent(\n new CustomEvent('scrollend', {\n bubbles: this.options.wrapper === window,\n // cancelable: false,\n detail: {\n lenisScrollEnd: true,\n },\n })\n )\n }\n\n private onTransitionEnd = (event: TransitionEvent) => {\n if (event.propertyName.includes('overflow')) {\n const property = this.isHorizontal ? 'overflow-x' : 'overflow-y'\n\n const overflow = getComputedStyle(this.rootElement)[\n property as keyof CSSStyleDeclaration\n ] as string\n\n if (['hidden', 'clip'].includes(overflow)) {\n this.internalStop()\n } else {\n this.internalStart()\n }\n }\n }\n\n private setScroll(scroll: number) {\n // behavior: 'instant' bypasses the scroll-behavior CSS property\n\n if (this.isHorizontal) {\n this.options.wrapper.scrollTo({ left: scroll, behavior: 'instant' })\n } else {\n this.options.wrapper.scrollTo({ top: scroll, behavior: 'instant' })\n }\n }\n\n private onClick = (event: PointerEvent | MouseEvent) => {\n const path = event.composedPath()\n const anchor = path.find(\n (node) =>\n node instanceof HTMLAnchorElement &&\n node.getAttribute('href')?.includes('#')\n ) as HTMLAnchorElement | undefined\n if (anchor) {\n const href = anchor.getAttribute('href')\n\n if (href) {\n const options =\n typeof this.options.anchors === 'object' && this.options.anchors\n ? this.options.anchors\n : undefined\n\n const target = `#${href.split('#')[1]}`\n\n this.scrollTo(target, options)\n }\n }\n }\n\n private onPointerDown = (event: PointerEvent | MouseEvent) => {\n if (event.button === 1) {\n this.reset()\n }\n }\n\n private onVirtualScroll = (data: VirtualScrollData) => {\n if (\n typeof this.options.virtualScroll === 'function' &&\n this.options.virtualScroll(data) === false\n )\n return\n\n const { deltaX, deltaY, event } = data\n\n this.emitter.emit('virtual-scroll', { deltaX, deltaY, event })\n\n // keep zoom feature\n if (event.ctrlKey) return\n // @ts-ignore\n if (event.lenisStopPropagation) return\n\n const isTouch = event.type.includes('touch')\n const isWheel = event.type.includes('wheel')\n\n this.isTouching = event.type === 'touchstart' || event.type === 'touchmove'\n // if (event.type === 'touchend') {\n // console.log('touchend', this.scroll)\n // // this.lastVelocity = this.velocity\n // // this.velocity = 0\n // // this.isScrolling = false\n // this.emit({ type: 'touchend' })\n // // alert('touchend')\n // return\n // }\n\n const isClickOrTap = deltaX === 0 && deltaY === 0\n\n const isTapToStop =\n this.options.syncTouch &&\n isTouch &&\n event.type === 'touchstart' &&\n isClickOrTap &&\n !this.isStopped &&\n !this.isLocked\n\n if (isTapToStop) {\n this.reset()\n return\n }\n\n // const isPullToRefresh =\n // this.options.gestureOrientation === 'vertical' &&\n // this.scroll === 0 &&\n // !this.options.infinite &&\n // deltaY <= 5 // touch pull to refresh, not reliable yet\n\n const isUnknownGesture =\n (this.options.gestureOrientation === 'vertical' && deltaY === 0) ||\n (this.options.gestureOrientation === 'horizontal' && deltaX === 0)\n\n if (isClickOrTap || isUnknownGesture) {\n // console.log('prevent')\n return\n }\n\n // catch if scrolling on nested scroll elements\n let composedPath = event.composedPath()\n composedPath = composedPath.slice(0, composedPath.indexOf(this.rootElement)) // remove parents elements\n\n const prevent = this.options.prevent\n\n if (\n !!composedPath.find(\n (node) =>\n node instanceof HTMLElement &&\n ((typeof prevent === 'function' && prevent?.(node)) ||\n node.hasAttribute?.('data-lenis-prevent') ||\n (isTouch && node.hasAttribute?.('data-lenis-prevent-touch')) ||\n (isWheel && node.hasAttribute?.('data-lenis-prevent-wheel')) ||\n (this.options.allowNestedScroll &&\n this.checkNestedScroll(node, { deltaX, deltaY })))\n )\n )\n return\n\n if (this.isStopped || this.isLocked) {\n if (event.cancelable) {\n event.preventDefault() // this will stop forwarding the event to the parent, this is problematic\n }\n return\n }\n\n const isSmooth =\n (this.options.syncTouch && isTouch) ||\n (this.options.smoothWheel && isWheel)\n\n if (!isSmooth) {\n this.isScrolling = 'native'\n this.animate.stop()\n // @ts-ignore\n event.lenisStopPropagation = true\n return\n }\n\n let delta = deltaY\n if (this.options.gestureOrientation === 'both') {\n delta = Math.abs(deltaY) > Math.abs(deltaX) ? deltaY : deltaX\n } else if (this.options.gestureOrientation === 'horizontal') {\n delta = deltaX\n }\n\n if (\n !this.options.overscroll ||\n this.options.infinite ||\n (this.options.wrapper !== window &&\n this.limit > 0 &&\n ((this.animatedScroll > 0 && this.animatedScroll < this.limit) ||\n (this.animatedScroll === 0 && deltaY > 0) ||\n (this.animatedScroll === this.limit && deltaY < 0)))\n ) {\n // @ts-ignore\n event.lenisStopPropagation = true\n // event.stopPropagation()\n }\n\n if (event.cancelable) {\n event.preventDefault()\n }\n\n const isSyncTouch = isTouch && this.options.syncTouch\n const isTouchEnd = isTouch && event.type === 'touchend'\n\n const hasTouchInertia = isTouchEnd\n\n if (hasTouchInertia) {\n // delta = this.velocity * this.options.touchInertiaMultiplier\n delta =\n Math.sign(this.velocity) *\n Math.pow(Math.abs(this.velocity), this.options.touchInertiaExponent)\n }\n\n this.scrollTo(this.targetScroll + delta, {\n programmatic: false,\n ...(isSyncTouch\n ? {\n lerp: hasTouchInertia ? this.options.syncTouchLerp : 1,\n // immediate: !hasTouchInertia,\n }\n : {\n lerp: this.options.lerp,\n duration: this.options.duration,\n easing: this.options.easing,\n }),\n })\n }\n\n /**\n * Force lenis to recalculate the dimensions\n */\n resize() {\n this.dimensions.resize()\n this.animatedScroll = this.targetScroll = this.actualScroll\n this.emit()\n }\n\n private emit() {\n this.emitter.emit('scroll', this)\n }\n\n private onNativeScroll = () => {\n if (this._resetVelocityTimeout !== null) {\n clearTimeout(this._resetVelocityTimeout)\n this._resetVelocityTimeout = null\n }\n\n if (this._preventNextNativeScrollEvent) {\n this._preventNextNativeScrollEvent = false\n return\n }\n\n if (this.isScrolling === false || this.isScrolling === 'native') {\n const lastScroll = this.animatedScroll\n this.animatedScroll = this.targetScroll = this.actualScroll\n this.lastVelocity = this.velocity\n this.velocity = this.animatedScroll - lastScroll\n this.direction = Math.sign(\n this.animatedScroll - lastScroll\n ) as Lenis['direction']\n\n if (!this.isStopped) {\n this.isScrolling = 'native'\n }\n\n this.emit()\n\n if (this.velocity !== 0) {\n this._resetVelocityTimeout = setTimeout(() => {\n this.lastVelocity = this.velocity\n this.velocity = 0\n this.isScrolling = false\n this.emit()\n }, 400)\n }\n }\n }\n\n private reset() {\n this.isLocked = false\n this.isScrolling = false\n this.animatedScroll = this.targetScroll = this.actualScroll\n this.lastVelocity = this.velocity = 0\n this.animate.stop()\n }\n\n /**\n * Start lenis scroll after it has been stopped\n */\n start() {\n if (!this.isStopped) return\n\n if (this.options.autoToggle) {\n this.rootElement.style.removeProperty('overflow')\n return\n }\n\n this.internalStart()\n }\n\n private internalStart() {\n if (!this.isStopped) return\n\n this.reset()\n this.isStopped = false\n this.emit()\n }\n\n /**\n * Stop lenis scroll\n */\n stop() {\n if (this.isStopped) return\n\n if (this.options.autoToggle) {\n this.rootElement.style.setProperty('overflow', 'clip')\n return\n }\n\n this.internalStop()\n }\n\n private internalStop() {\n if (this.isStopped) return\n\n this.reset()\n this.isStopped = true\n this.emit()\n }\n\n /**\n * RequestAnimationFrame for lenis\n *\n * @param time The time in ms from an external clock like `requestAnimationFrame` or Tempus\n */\n raf = (time: number) => {\n const deltaTime = time - (this.time || time)\n this.time = time\n\n this.animate.advance(deltaTime * 0.001)\n\n if (this.options.autoRaf) {\n this.__rafID = requestAnimationFrame(this.raf)\n }\n }\n\n /**\n * Scroll to a target value\n *\n * @param target The target value to scroll to\n * @param options The options for the scroll\n *\n * @example\n * lenis.scrollTo(100, {\n * offset: 100,\n * duration: 1,\n * easing: (t) => 1 - Math.cos((t * Math.PI) / 2),\n * lerp: 0.1,\n * onStart: () => {\n * console.log('onStart')\n * },\n * onComplete: () => {\n * console.log('onComplete')\n * },\n * })\n */\n scrollTo(\n target: number | string | HTMLElement,\n {\n offset = 0,\n immediate = false,\n lock = false,\n duration = this.options.duration,\n easing = this.options.easing,\n lerp = this.options.lerp,\n onStart,\n onComplete,\n force = false, // scroll even if stopped\n programmatic = true, // called from outside of the class\n userData,\n }: ScrollToOptions = {}\n ) {\n if ((this.isStopped || this.isLocked) && !force) return\n\n // keywords\n if (\n typeof target === 'string' &&\n ['top', 'left', 'start', '#'].includes(target)\n ) {\n target = 0\n } else if (\n typeof target === 'string' &&\n ['bottom', 'right', 'end'].includes(target)\n ) {\n target = this.limit\n } else {\n let node\n\n if (typeof target === 'string') {\n // CSS selector\n node = document.querySelector(target)\n\n if (!node) {\n if (target === '#top') {\n target = 0\n } else {\n console.warn('Lenis: Target not found', target)\n }\n }\n } else if (target instanceof HTMLElement && target?.nodeType) {\n // Node element\n node = target\n }\n\n if (node) {\n if (this.options.wrapper !== window) {\n // nested scroll offset correction\n const wrapperRect = this.rootElement.getBoundingClientRect()\n offset -= this.isHorizontal ? wrapperRect.left : wrapperRect.top\n }\n\n const rect = node.getBoundingClientRect()\n\n target =\n (this.isHorizontal ? rect.left : rect.top) + this.animatedScroll\n }\n }\n\n if (typeof target !== 'number') return\n\n target += offset\n target = Math.round(target)\n\n if (this.options.infinite) {\n if (programmatic) {\n this.targetScroll = this.animatedScroll = this.scroll\n\n const distance = target - this.animatedScroll\n\n if (distance > this.limit / 2) {\n target = target - this.limit\n } else if (distance < -this.limit / 2) {\n target = target + this.limit\n }\n }\n } else {\n target = clamp(0, target, this.limit)\n }\n\n if (target === this.targetScroll) {\n onStart?.(this)\n onComplete?.(this)\n return\n }\n\n this.userData = userData ?? {}\n\n if (immediate) {\n this.animatedScroll = this.targetScroll = target\n this.setScroll(this.scroll)\n this.reset()\n this.preventNextNativeScrollEvent()\n this.emit()\n onComplete?.(this)\n this.userData = {}\n\n requestAnimationFrame(() => {\n this.dispatchScrollendEvent()\n })\n return\n }\n\n if (!programmatic) {\n this.targetScroll = target\n }\n\n // flip to easing/time based animation if at least one of them is provided\n if (typeof duration === 'number' && typeof easing !== 'function') {\n easing = defaultEasing\n } else if (typeof easing === 'function' && typeof duration !== 'number') {\n duration = 1\n }\n\n this.animate.fromTo(this.animatedScroll, target, {\n duration,\n easing,\n lerp,\n onStart: () => {\n // started\n if (lock) this.isLocked = true\n this.isScrolling = 'smooth'\n onStart?.(this)\n },\n onUpdate: (value: number, completed: boolean) => {\n this.isScrolling = 'smooth'\n\n // updated\n this.lastVelocity = this.velocity\n this.velocity = value - this.animatedScroll\n this.direction = Math.sign(this.velocity) as Lenis['direction']\n\n this.animatedScroll = value\n this.setScroll(this.scroll)\n\n if (programmatic) {\n // wheel during programmatic should stop it\n this.targetScroll = value\n }\n\n if (!completed) this.emit()\n\n if (completed) {\n this.reset()\n this.emit()\n onComplete?.(this)\n this.userData = {}\n\n requestAnimationFrame(() => {\n this.dispatchScrollendEvent()\n })\n\n // avoid emitting event twice\n this.preventNextNativeScrollEvent()\n }\n },\n })\n }\n\n private preventNextNativeScrollEvent() {\n this._preventNextNativeScrollEvent = true\n\n requestAnimationFrame(() => {\n this._preventNextNativeScrollEvent = false\n })\n }\n\n private checkNestedScroll(\n node: HTMLElement,\n { deltaX, deltaY }: { deltaX: number; deltaY: number }\n ) {\n const time = Date.now()\n\n // @ts-ignore\n const cache = (node._lenis ??= {})\n\n let hasOverflowX,\n hasOverflowY,\n isScrollableX,\n isScrollableY,\n scrollWidth,\n scrollHeight,\n clientWidth,\n clientHeight\n\n const gestureOrientation = this.options.gestureOrientation\n\n if (time - (cache.time ?? 0) > 2000) {\n cache.time = Date.now()\n\n const computedStyle = window.getComputedStyle(node)\n cache.computedStyle = computedStyle\n\n const overflowXString = computedStyle.overflowX\n const overflowYString = computedStyle.overflowY\n\n hasOverflowX = ['auto', 'overlay', 'scroll'].includes(overflowXString)\n hasOverflowY = ['auto', 'overlay', 'scroll'].includes(overflowYString)\n cache.hasOverflowX = hasOverflowX\n cache.hasOverflowY = hasOverflowY\n\n if (!hasOverflowX && !hasOverflowY) return false // if no overflow, it's not scrollable no matter what, early return saves some computations\n if (gestureOrientation === 'vertical' && !hasOverflowY) return false\n if (gestureOrientation === 'horizontal' && !hasOverflowX) return false\n\n scrollWidth = node.scrollWidth\n scrollHeight = node.scrollHeight\n\n clientWidth = node.clientWidth\n clientHeight = node.clientHeight\n\n isScrollableX = scrollWidth > clientWidth\n isScrollableY = scrollHeight > clientHeight\n\n cache.isScrollableX = isScrollableX\n cache.isScrollableY = isScrollableY\n cache.scrollWidth = scrollWidth\n cache.scrollHeight = scrollHeight\n cache.clientWidth = clientWidth\n cache.clientHeight = clientHeight\n } else {\n isScrollableX = cache.isScrollableX\n isScrollableY = cache.isScrollableY\n hasOverflowX = cache.hasOverflowX\n hasOverflowY = cache.hasOverflowY\n scrollWidth = cache.scrollWidth\n scrollHeight = cache.scrollHeight\n clientWidth = cache.clientWidth\n clientHeight = cache.clientHeight\n }\n\n if (\n (!hasOverflowX && !hasOverflowY) ||\n (!isScrollableX && !isScrollableY)\n ) {\n return false\n }\n\n if (gestureOrientation === 'vertical' && (!hasOverflowY || !isScrollableY))\n return false\n\n if (\n gestureOrientation === 'horizontal' &&\n (!hasOverflowX || !isScrollableX)\n )\n return false\n\n let orientation: 'x' | 'y' | undefined\n\n if (gestureOrientation === 'horizontal') {\n orientation = 'x'\n } else if (gestureOrientation === 'vertical') {\n orientation = 'y'\n } else {\n const isScrollingX = deltaX !== 0\n const isScrollingY = deltaY !== 0\n\n if (isScrollingX && hasOverflowX && isScrollableX) {\n orientation = 'x'\n }\n\n if (isScrollingY && hasOverflowY && isScrollableY) {\n orientation = 'y'\n }\n }\n\n if (!orientation) return false\n\n let scroll, maxScroll, delta, hasOverflow, isScrollable\n\n if (orientation === 'x') {\n scroll = node.scrollLeft\n maxScroll = scrollWidth - clientWidth\n delta = deltaX\n\n hasOverflow = hasOverflowX\n isScrollable = isScrollableX\n } else if (orientation === 'y') {\n scroll = node.scrollTop\n maxScroll = scrollHeight - clientHeight\n delta = deltaY\n\n hasOverflow = hasOverflowY\n isScrollable = isScrollableY\n } else {\n return false\n }\n\n const willScroll = delta > 0 ? scroll < maxScroll : scroll > 0\n\n return willScroll && hasOverflow && isScrollable\n }\n\n /**\n * The root element on which lenis is instanced\n */\n get rootElement() {\n return (\n this.options.wrapper === window\n ? document.documentElement\n : this.options.wrapper\n ) as HTMLElement\n }\n\n /**\n * The limit which is the maximum scroll value\n */\n get limit() {\n if (this.options.__experimental__naiveDimensions) {\n if (this.isHorizontal) {\n return this.rootElement.scrollWidth - this.rootElement.clientWidth\n } else {\n return this.rootElement.scrollHeight - this.rootElement.clientHeight\n }\n } else {\n return this.dimensions.limit[this.isHorizontal ? 'x' : 'y']\n }\n }\n\n /**\n * Whether or not the scroll is horizontal\n */\n get isHorizontal() {\n return this.options.orientation === 'horizontal'\n }\n\n /**\n * The actual scroll value\n */\n get actualScroll() {\n // value browser takes into account\n // it has to be this way because of DOCTYPE declaration\n const wrapper = this.options.wrapper as Window | HTMLElement\n\n return this.isHorizontal\n ? (wrapper as Window).scrollX ?? (wrapper as HTMLElement).scrollLeft\n : (wrapper as Window).scrollY ?? (wrapper as HTMLElement).scrollTop\n }\n\n /**\n * The current scroll value\n */\n get scroll() {\n return this.options.infinite\n ? modulo(this.animatedScroll, this.limit)\n : this.animatedScroll\n }\n\n /**\n * The progress of the scroll relative to the limit\n */\n get progress() {\n // avoid progress to be NaN\n return this.limit === 0 ? 1 : this.scroll / this.limit\n }\n\n /**\n * Current scroll state\n */\n get isScrolling() {\n return this._isScrolling\n }\n\n private set isScrolling(value: Scrolling) {\n if (this._isScrolling !== value) {\n this._isScrolling = value\n this.updateClassName()\n }\n }\n\n /**\n * Check if lenis is stopped\n */\n get isStopped() {\n return this._isStopped\n }\n\n private set isStopped(value: boolean) {\n if (this._isStopped !== value) {\n this._isStopped = value\n this.updateClassName()\n }\n }\n\n /**\n * Check if lenis is locked\n */\n get isLocked() {\n return this._isLocked\n }\n\n private set isLocked(value: boolean) {\n if (this._isLocked !== value) {\n this._isLocked = value\n this.updateClassName()\n }\n }\n\n /**\n * Check if lenis is smooth scrolling\n */\n get isSmooth() {\n return this.isScrolling === 'smooth'\n }\n\n /**\n * The class name applied to the wrapper element\n */\n get className() {\n let className = 'lenis'\n if (this.options.autoToggle) className += ' lenis-autoToggle'\n if (this.isStopped) className += ' lenis-stopped'\n if (this.isLocked) className += ' lenis-locked'\n if (this.isScrolling) className += ' lenis-scrolling'\n if (this.isScrolling === 'smooth') className += ' lenis-smooth'\n return className\n }\n\n private updateClassName() {\n this.cleanUpClassName()\n\n this.rootElement.className =\n `${this.rootElement.className} ${this.className}`.trim()\n }\n\n private cleanUpClassName() {\n this.rootElement.className = this.rootElement.className\n .replace(/lenis(-\\w+)?/g, '')\n .trim()\n 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