feat(*): Add unstyled product page

src/routes/products/[productId]/+page.svelte

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+<script lang="ts">
+	import { onDestroy, onMount } from 'svelte';
+	import { basket, type Basket, type Item } from '$lib/stores/basket.js';
+
+	/** @type {import('./$types').PageData} */
+	export let data;
+
+	let localBasket: Basket;
+	const unsubscribeToBasket = basket.subscribe((value) => {
+		localBasket = value;
+	});
+	onDestroy(unsubscribeToBasket);
+
+	function addToBasket() {
+		basket.update((value) => {
+			const existingItemIndex = value.items.findIndex((basketItem) => basketItem.id === item.id);
+
+			if (existingItemIndex !== -1) {
+				// Item already exists in the basket, increase quantity
+				const newItems = [...value.items];
+				newItems[existingItemIndex].quantity += 1;
+				return { ...value, items: newItems };
+			} else {
+				// Item does not exist in the basket, add new item
+				return {
+					...value,
+					items: [...value.items, item]
+				};
+			}
+		});
+	}
+
+	let item = {};
+
+	onMount(() => {
+		fetch(`/products/${data.productId}`)
+			.then((response) => response.json())
+			.then((product) => {
+				item = {
+					id: product.id,
+					name: product.name,
+					categoryDescription: product.description,
+					imgAlt: product.description,
+					imgSrc: product.images[0],
+					price: 0,
+					priceId: product.default_price,
+					quantity: 1
+				};
+
+				// Fetch the price of the product
+				fetch(`/products/prices/${product.default_price}`)
+					.then((response) => response.json())
+					.then((price) => {
+						item.price = price.unit_amount / 100;
+					});
+			});
+	});
+</script>
+
+data.productId= {data.productId}
+<br />
+item.id= {item.id}
+<br />
+item.name= {item.name}
+<br />
+<button class="btn" on:click={addToBasket}>Add to basket</button>

src/routes/products/[productId]/+page.ts

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+/** @type {import('./$types').PageLoad} */
+export function load({ params }) {
+	return params;
+}

src/routes/products/[productId]/+server.ts

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+import { json } from '@sveltejs/kit';
+import { PUBLIC_STRIPE_SECRET_KEY } from '$env/static/public';
+import stripe from 'stripe';
+const stripeClient = new stripe(PUBLIC_STRIPE_SECRET_KEY);
+
+export const GET = async ({ params }) => {
+	const { productId } = params;
+	const product = await stripeClient.products.retrieve(productId);
+	return json(product);
+};