init

src/lib/Message.svelte

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+<script lang="ts">
+	import type { IMessage } from '$lib/message';
+
+	interface Props {
+		message: IMessage;
+		localSenderId: number;
+	}
+
+	let { message, localSenderId }: Props = $props();
+</script>
+
+<div
+	class={[
+		'bg-accent text-accent-foreground w-fit max-w-[70%] rounded-lg px-4 py-2',
+		message.senderId === localSenderId && 'self-end bg-primary text-primary-foreground'
+	]}
+>
+	<p>{message.content}</p>
+</div>

src/lib/components/ui/button/button.svelte

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+<script lang="ts" module>
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import type { HTMLAnchorAttributes, HTMLButtonAttributes } from "svelte/elements";
+	import { type VariantProps, tv } from "tailwind-variants";
+
+	export const buttonVariants = tv({
+		base: "focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive inline-flex shrink-0 items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium outline-none transition-all focus-visible:ring-[3px] disabled:pointer-events-none disabled:opacity-50 aria-disabled:pointer-events-none aria-disabled:opacity-50 [&_svg:not([class*='size-'])]:size-4 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		variants: {
+			variant: {
+				default: "bg-primary text-primary-foreground shadow-xs hover:bg-primary/90",
+				destructive:
+					"bg-destructive shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60 text-white",
+				outline:
+					"bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50 border",
+				secondary: "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80",
+				ghost: "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
+				link: "text-primary underline-offset-4 hover:underline",
+			},
+			size: {
+				default: "h-9 px-4 py-2 has-[>svg]:px-3",
+				sm: "h-8 gap-1.5 rounded-md px-3 has-[>svg]:px-2.5",
+				lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
+				icon: "size-9",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+			size: "default",
+		},
+	});
+
+	export type ButtonVariant = VariantProps<typeof buttonVariants>["variant"];
+	export type ButtonSize = VariantProps<typeof buttonVariants>["size"];
+
+	export type ButtonProps = WithElementRef<HTMLButtonAttributes> &
+		WithElementRef<HTMLAnchorAttributes> & {
+			variant?: ButtonVariant;
+			size?: ButtonSize;
+		};
+</script>
+
+<script lang="ts">
+	let {
+		class: className,
+		variant = "default",
+		size = "default",
+		ref = $bindable(null),
+		href = undefined,
+		type = "button",
+		disabled,
+		children,
+		...restProps
+	}: ButtonProps = $props();
+</script>
+
+{#if href}
+	<a
+		bind:this={ref}
+		data-slot="button"
+		class={cn(buttonVariants({ variant, size }), className)}
+		href={disabled ? undefined : href}
+		aria-disabled={disabled}
+		role={disabled ? "link" : undefined}
+		tabindex={disabled ? -1 : undefined}
+		{...restProps}
+	>
+		{@render children?.()}
+	</a>
+{:else}
+	<button
+		bind:this={ref}
+		data-slot="button"
+		class={cn(buttonVariants({ variant, size }), className)}
+		{type}
+		{disabled}
+		{...restProps}
+	>
+		{@render children?.()}
+	</button>
+{/if}

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

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+import Root, {
+	type ButtonProps,
+	type ButtonSize,
+	type ButtonVariant,
+	buttonVariants,
+} from "./button.svelte";
+
+export {
+	Root,
+	type ButtonProps as Props,
+	//
+	Root as Button,
+	buttonVariants,
+	type ButtonProps,
+	type ButtonSize,
+	type ButtonVariant,
+};

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

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+import Root from "./input.svelte";
+
+export {
+	Root,
+	//
+	Root as Input,
+};

src/lib/components/ui/input/input.svelte

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+<script lang="ts">
+	import type { HTMLInputAttributes, HTMLInputTypeAttribute } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	type InputType = Exclude<HTMLInputTypeAttribute, "file">;
+
+	type Props = WithElementRef<
+		Omit<HTMLInputAttributes, "type"> &
+			({ type: "file"; files?: FileList } | { type?: InputType; files?: undefined })
+	>;
+
+	let {
+		ref = $bindable(null),
+		value = $bindable(),
+		type,
+		files = $bindable(),
+		class: className,
+		...restProps
+	}: Props = $props();
+</script>
+
+{#if type === "file"}
+	<input
+		bind:this={ref}
+		data-slot="input"
+		class={cn(
+			"selection:bg-primary dark:bg-input/30 selection:text-primary-foreground border-input ring-offset-background placeholder:text-muted-foreground shadow-xs flex h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-2 text-sm font-medium outline-none transition-[color,box-shadow] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+			"focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
+			"aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+			className
+		)}
+		type="file"
+		bind:files
+		bind:value
+		{...restProps}
+	/>
+{:else}
+	<input
+		bind:this={ref}
+		data-slot="input"
+		class={cn(
+			"border-input bg-background selection:bg-primary dark:bg-input/30 selection:text-primary-foreground ring-offset-background placeholder:text-muted-foreground shadow-xs flex h-9 w-full min-w-0 rounded-md border px-3 py-1 text-base outline-none transition-[color,box-shadow] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+			"focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
+			"aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+			className
+		)}
+		{type}
+		bind:value
+		{...restProps}
+	/>
+{/if}

src/lib/message.ts

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+export interface IMessage {
+	senderId: number;
+	content: string;
+};

src/lib/socket.ts

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+export class ChatSocket {
+	#socket: WebSocket;
+
+	constructor(url: string) {
+		this.#socket = new WebSocket(url);
+
+		this.#socket.onopen = (e) => {
+			this.#onOpen(e);
+		};
+
+		this.#socket.onerror = (e) => {
+			this.#onError(e);
+		};
+
+		this.#socket.onmessage = (e) => {
+			this.#onMessage(e);
+		};
+
+		this.#socket.onclose = (e) => {
+			this.#onClose(e);
+		};
+	}
+
+	#onOpen(e: Event) {
+		console.log('onOpen', e);
+	}
+
+	#onError(e: Event) {
+		console.log('onError', e);
+	}
+
+	#onMessage(e: MessageEvent) {
+		console.log('onMessage', e);
+	}
+
+	#onClose(e: CloseEvent) {
+		console.log('onClose', e);
+	}
+}

src/lib/utils.ts

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+import { clsx, type ClassValue } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+	return twMerge(clsx(inputs));
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export type WithoutChild<T> = T extends { child?: any } ? Omit<T, "child"> : T;
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export type WithoutChildren<T> = T extends { children?: any } ? Omit<T, "children"> : T;
+export type WithoutChildrenOrChild<T> = WithoutChildren<WithoutChild<T>>;
+export type WithElementRef<T, U extends HTMLElement = HTMLElement> = T & { ref?: U | null };