switch to sveltekit and make big progress

src/lib/components/ui/calendar/calendar-caption.svelte

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+<script lang="ts">
+	import type { ComponentProps } from "svelte";
+	import type Calendar from "./calendar.svelte";
+	import CalendarMonthSelect from "./calendar-month-select.svelte";
+	import CalendarYearSelect from "./calendar-year-select.svelte";
+	import { DateFormatter, getLocalTimeZone, type DateValue } from "@internationalized/date";
+
+	let {
+		captionLayout,
+		months,
+		monthFormat,
+		years,
+		yearFormat,
+		month,
+		locale,
+		placeholder = $bindable(),
+		monthIndex = 0,
+	}: {
+		captionLayout: ComponentProps<typeof Calendar>["captionLayout"];
+		months: ComponentProps<typeof CalendarMonthSelect>["months"];
+		monthFormat: ComponentProps<typeof CalendarMonthSelect>["monthFormat"];
+		years: ComponentProps<typeof CalendarYearSelect>["years"];
+		yearFormat: ComponentProps<typeof CalendarYearSelect>["yearFormat"];
+		month: DateValue;
+		placeholder: DateValue | undefined;
+		locale: string;
+		monthIndex: number;
+	} = $props();
+
+	function formatYear(date: DateValue) {
+		const dateObj = date.toDate(getLocalTimeZone());
+		if (typeof yearFormat === "function") return yearFormat(dateObj.getFullYear());
+		return new DateFormatter(locale, { year: yearFormat }).format(dateObj);
+	}
+
+	function formatMonth(date: DateValue) {
+		const dateObj = date.toDate(getLocalTimeZone());
+		if (typeof monthFormat === "function") return monthFormat(dateObj.getMonth() + 1);
+		return new DateFormatter(locale, { month: monthFormat }).format(dateObj);
+	}
+</script>
+
+{#snippet MonthSelect()}
+	<CalendarMonthSelect
+		{months}
+		{monthFormat}
+		value={month.month}
+		onchange={(e) => {
+			if (!placeholder) return;
+			const v = Number.parseInt(e.currentTarget.value);
+			const newPlaceholder = placeholder.set({ month: v });
+			placeholder = newPlaceholder.subtract({ months: monthIndex });
+		}}
+	/>
+{/snippet}
+
+{#snippet YearSelect()}
+	<CalendarYearSelect {years} {yearFormat} value={month.year} />
+{/snippet}
+
+{#if captionLayout === "dropdown"}
+	{@render MonthSelect()}
+	{@render YearSelect()}
+{:else if captionLayout === "dropdown-months"}
+	{@render MonthSelect()}
+	{#if placeholder}
+		{formatYear(placeholder)}
+	{/if}
+{:else if captionLayout === "dropdown-years"}
+	{#if placeholder}
+		{formatMonth(placeholder)}
+	{/if}
+	{@render YearSelect()}
+{:else}
+	{formatMonth(month)} {formatYear(month)}
+{/if}

src/lib/components/ui/calendar/calendar-cell.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.CellProps = $props();
+</script>
+
+<CalendarPrimitive.Cell
+	bind:ref
+	class={cn(
+		"size-(--cell-size) relative p-0 text-center text-sm focus-within:z-20 [&:first-child[data-selected]_[data-bits-day]]:rounded-l-md [&:last-child[data-selected]_[data-bits-day]]:rounded-r-md",
+		className
+	)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-day.svelte

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+<script lang="ts">
+	import { buttonVariants } from "$lib/components/ui/button/index.js";
+	import { cn } from "$lib/utils.js";
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.DayProps = $props();
+</script>
+
+<CalendarPrimitive.Day
+	bind:ref
+	class={cn(
+		buttonVariants({ variant: "ghost" }),
+		"size-(--cell-size) flex select-none flex-col items-center justify-center gap-1 whitespace-nowrap p-0 font-normal leading-none",
+		"[&[data-today]:not([data-selected])]:bg-accent [&[data-today]:not([data-selected])]:text-accent-foreground [&[data-today][data-disabled]]:text-muted-foreground",
+		"data-[selected]:bg-primary dark:data-[selected]:hover:bg-accent/50 data-[selected]:text-primary-foreground",
+		// Outside months
+		"[&[data-outside-month]:not([data-selected])]:text-muted-foreground [&[data-outside-month]:not([data-selected])]:hover:text-accent-foreground",
+		// Disabled
+		"data-[disabled]:text-muted-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+		// Unavailable
+		"data-[unavailable]:text-muted-foreground data-[unavailable]:line-through",
+		// hover
+		"dark:hover:text-accent-foreground",
+		// focus
+		"focus:border-ring focus:ring-ring/50 focus:relative",
+		// inner spans
+		"[&>span]:text-xs [&>span]:opacity-70",
+		className
+	)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-grid-body.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.GridBodyProps = $props();
+</script>
+
+<CalendarPrimitive.GridBody bind:ref class={cn(className)} {...restProps} />

src/lib/components/ui/calendar/calendar-grid-head.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.GridHeadProps = $props();
+</script>
+
+<CalendarPrimitive.GridHead bind:ref class={cn(className)} {...restProps} />

src/lib/components/ui/calendar/calendar-grid-row.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.GridRowProps = $props();
+</script>
+
+<CalendarPrimitive.GridRow bind:ref class={cn("flex", className)} {...restProps} />

src/lib/components/ui/calendar/calendar-grid.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.GridProps = $props();
+</script>
+
+<CalendarPrimitive.Grid
+	bind:ref
+	class={cn("mt-4 flex w-full border-collapse flex-col gap-1", className)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-head-cell.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.HeadCellProps = $props();
+</script>
+
+<CalendarPrimitive.HeadCell
+	bind:ref
+	class={cn(
+		"text-muted-foreground w-(--cell-size) rounded-md text-[0.8rem] font-normal",
+		className
+	)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-header.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.HeaderProps = $props();
+</script>
+
+<CalendarPrimitive.Header
+	bind:ref
+	class={cn(
+		"h-(--cell-size) flex w-full items-center justify-center gap-1.5 text-sm font-medium",
+		className
+	)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-heading.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CalendarPrimitive.HeadingProps = $props();
+</script>
+
+<CalendarPrimitive.Heading
+	bind:ref
+	class={cn("px-(--cell-size) text-sm font-medium", className)}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-month-select.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+	import ChevronDownIcon from "@lucide/svelte/icons/chevron-down";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		value,
+		onchange,
+		...restProps
+	}: WithoutChildrenOrChild<CalendarPrimitive.MonthSelectProps> = $props();
+</script>
+
+<span
+	class={cn(
+		"has-focus:border-ring border-input shadow-xs has-focus:ring-ring/50 has-focus:ring-[3px] relative flex rounded-md border",
+		className
+	)}
+>
+	<CalendarPrimitive.MonthSelect bind:ref class="absolute inset-0 opacity-0" {...restProps}>
+		{#snippet child({ props, monthItems, selectedMonthItem })}
+			<select {...props} {value} {onchange}>
+				{#each monthItems as monthItem (monthItem.value)}
+					<option
+						value={monthItem.value}
+						selected={value !== undefined
+							? monthItem.value === value
+							: monthItem.value === selectedMonthItem.value}
+					>
+						{monthItem.label}
+					</option>
+				{/each}
+			</select>
+			<span
+				class="[&>svg]:text-muted-foreground flex h-8 select-none items-center gap-1 rounded-md pl-2 pr-1 text-sm font-medium [&>svg]:size-3.5"
+				aria-hidden="true"
+			>
+				{monthItems.find((item) => item.value === value)?.label || selectedMonthItem.label}
+				<ChevronDownIcon class="size-4" />
+			</span>
+		{/snippet}
+	</CalendarPrimitive.MonthSelect>
+</span>

src/lib/components/ui/calendar/calendar-month.svelte

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+<script lang="ts">
+	import { type WithElementRef, cn } from "$lib/utils.js";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLElement>> = $props();
+</script>
+
+<div {...restProps} bind:this={ref} class={cn("flex flex-col", className)}>
+	{@render children?.()}
+</div>

src/lib/components/ui/calendar/calendar-months.svelte

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+<script lang="ts">
+	import type { HTMLAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> = $props();
+</script>
+
+<div
+	bind:this={ref}
+	class={cn("relative flex flex-col gap-4 md:flex-row", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>

src/lib/components/ui/calendar/calendar-nav.svelte

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+<script lang="ts">
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLElement>> = $props();
+</script>
+
+<nav
+	{...restProps}
+	bind:this={ref}
+	class={cn("absolute inset-x-0 top-0 flex w-full items-center justify-between gap-1", className)}
+>
+	{@render children?.()}
+</nav>

src/lib/components/ui/calendar/calendar-next-button.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import ChevronRightIcon from "@lucide/svelte/icons/chevron-right";
+	import { buttonVariants, type ButtonVariant } from "$lib/components/ui/button/index.js";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		variant = "ghost",
+		...restProps
+	}: CalendarPrimitive.NextButtonProps & {
+		variant?: ButtonVariant;
+	} = $props();
+</script>
+
+{#snippet Fallback()}
+	<ChevronRightIcon class="size-4" />
+{/snippet}
+
+<CalendarPrimitive.NextButton
+	bind:ref
+	class={cn(
+		buttonVariants({ variant }),
+		"size-(--cell-size) select-none bg-transparent p-0 disabled:opacity-50 rtl:rotate-180",
+		className
+	)}
+	children={children || Fallback}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-prev-button.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import ChevronLeftIcon from "@lucide/svelte/icons/chevron-left";
+	import { buttonVariants, type ButtonVariant } from "$lib/components/ui/button/index.js";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		variant = "ghost",
+		...restProps
+	}: CalendarPrimitive.PrevButtonProps & {
+		variant?: ButtonVariant;
+	} = $props();
+</script>
+
+{#snippet Fallback()}
+	<ChevronLeftIcon class="size-4" />
+{/snippet}
+
+<CalendarPrimitive.PrevButton
+	bind:ref
+	class={cn(
+		buttonVariants({ variant }),
+		"size-(--cell-size) select-none bg-transparent p-0 disabled:opacity-50 rtl:rotate-180",
+		className
+	)}
+	children={children || Fallback}
+	{...restProps}
+/>

src/lib/components/ui/calendar/calendar-year-select.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+	import ChevronDownIcon from "@lucide/svelte/icons/chevron-down";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		value,
+		...restProps
+	}: WithoutChildrenOrChild<CalendarPrimitive.YearSelectProps> = $props();
+</script>
+
+<span
+	class={cn(
+		"has-focus:border-ring border-input shadow-xs has-focus:ring-ring/50 has-focus:ring-[3px] relative flex rounded-md border",
+		className
+	)}
+>
+	<CalendarPrimitive.YearSelect bind:ref class="absolute inset-0 opacity-0" {...restProps}>
+		{#snippet child({ props, yearItems, selectedYearItem })}
+			<select {...props} {value}>
+				{#each yearItems as yearItem (yearItem.value)}
+					<option
+						value={yearItem.value}
+						selected={value !== undefined
+							? yearItem.value === value
+							: yearItem.value === selectedYearItem.value}
+					>
+						{yearItem.label}
+					</option>
+				{/each}
+			</select>
+			<span
+				class="[&>svg]:text-muted-foreground flex h-8 select-none items-center gap-1 rounded-md pl-2 pr-1 text-sm font-medium [&>svg]:size-3.5"
+				aria-hidden="true"
+			>
+				{yearItems.find((item) => item.value === value)?.label || selectedYearItem.label}
+				<ChevronDownIcon class="size-4" />
+			</span>
+		{/snippet}
+	</CalendarPrimitive.YearSelect>
+</span>

src/lib/components/ui/calendar/calendar.svelte

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+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import * as Calendar from "./index.js";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+	import type { ButtonVariant } from "../button/button.svelte";
+	import { isEqualMonth, type DateValue } from "@internationalized/date";
+	import type { Snippet } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		value = $bindable(),
+		placeholder = $bindable(),
+		class: className,
+		weekdayFormat = "short",
+		buttonVariant = "ghost",
+		captionLayout = "label",
+		locale = "en-US",
+		months: monthsProp,
+		years,
+		monthFormat: monthFormatProp,
+		yearFormat = "numeric",
+		day,
+		disableDaysOutsideMonth = false,
+		...restProps
+	}: WithoutChildrenOrChild<CalendarPrimitive.RootProps> & {
+		buttonVariant?: ButtonVariant;
+		captionLayout?: "dropdown" | "dropdown-months" | "dropdown-years" | "label";
+		months?: CalendarPrimitive.MonthSelectProps["months"];
+		years?: CalendarPrimitive.YearSelectProps["years"];
+		monthFormat?: CalendarPrimitive.MonthSelectProps["monthFormat"];
+		yearFormat?: CalendarPrimitive.YearSelectProps["yearFormat"];
+		day?: Snippet<[{ day: DateValue; outsideMonth: boolean }]>;
+	} = $props();
+
+	const monthFormat = $derived.by(() => {
+		if (monthFormatProp) return monthFormatProp;
+		if (captionLayout.startsWith("dropdown")) return "short";
+		return "long";
+	});
+</script>
+
+<!--
+Discriminated Unions + Destructing (required for bindable) do not
+get along, so we shut typescript up by casting `value` to `never`.
+-->
+<CalendarPrimitive.Root
+	bind:value={value as never}
+	bind:ref
+	bind:placeholder
+	{weekdayFormat}
+	{disableDaysOutsideMonth}
+	class={cn(
+		"bg-background group/calendar p-3 [--cell-size:--spacing(8)] [[data-slot=card-content]_&]:bg-transparent [[data-slot=popover-content]_&]:bg-transparent",
+		className
+	)}
+	{locale}
+	{monthFormat}
+	{yearFormat}
+	{...restProps}
+>
+	{#snippet children({ months, weekdays })}
+		<Calendar.Months>
+			<Calendar.Nav>
+				<Calendar.PrevButton variant={buttonVariant} />
+				<Calendar.NextButton variant={buttonVariant} />
+			</Calendar.Nav>
+			{#each months as month, monthIndex (month)}
+				<Calendar.Month>
+					<Calendar.Header>
+						<Calendar.Caption
+							{captionLayout}
+							months={monthsProp}
+							{monthFormat}
+							{years}
+							{yearFormat}
+							month={month.value}
+							bind:placeholder
+							{locale}
+							{monthIndex}
+						/>
+					</Calendar.Header>
+					<Calendar.Grid>
+						<Calendar.GridHead>
+							<Calendar.GridRow class="select-none">
+								{#each weekdays as weekday (weekday)}
+									<Calendar.HeadCell>
+										{weekday.slice(0, 2)}
+									</Calendar.HeadCell>
+								{/each}
+							</Calendar.GridRow>
+						</Calendar.GridHead>
+						<Calendar.GridBody>
+							{#each month.weeks as weekDates (weekDates)}
+								<Calendar.GridRow class="mt-2 w-full">
+									{#each weekDates as date (date)}
+										<Calendar.Cell {date} month={month.value}>
+											{#if day}
+												{@render day({
+													day: date,
+													outsideMonth: !isEqualMonth(date, month.value),
+												})}
+											{:else}
+												<Calendar.Day />
+											{/if}
+										</Calendar.Cell>
+									{/each}
+								</Calendar.GridRow>
+							{/each}
+						</Calendar.GridBody>
+					</Calendar.Grid>
+				</Calendar.Month>
+			{/each}
+		</Calendar.Months>
+	{/snippet}
+</CalendarPrimitive.Root>

src/lib/components/ui/calendar/index.ts

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+import Root from "./calendar.svelte";
+import Cell from "./calendar-cell.svelte";
+import Day from "./calendar-day.svelte";
+import Grid from "./calendar-grid.svelte";
+import Header from "./calendar-header.svelte";
+import Months from "./calendar-months.svelte";
+import GridRow from "./calendar-grid-row.svelte";
+import Heading from "./calendar-heading.svelte";
+import GridBody from "./calendar-grid-body.svelte";
+import GridHead from "./calendar-grid-head.svelte";
+import HeadCell from "./calendar-head-cell.svelte";
+import NextButton from "./calendar-next-button.svelte";
+import PrevButton from "./calendar-prev-button.svelte";
+import MonthSelect from "./calendar-month-select.svelte";
+import YearSelect from "./calendar-year-select.svelte";
+import Month from "./calendar-month.svelte";
+import Nav from "./calendar-nav.svelte";
+import Caption from "./calendar-caption.svelte";
+
+export {
+	Day,
+	Cell,
+	Grid,
+	Header,
+	Months,
+	GridRow,
+	Heading,
+	GridBody,
+	GridHead,
+	HeadCell,
+	NextButton,
+	PrevButton,
+	Nav,
+	Month,
+	YearSelect,
+	MonthSelect,
+	Caption,
+	//
+	Root as Calendar,
+};