Complete rewrite and added html to react element using svelte compiler

examples/src/routes/cog/+server.ts

@@ -1,6 +1,6 @@
 import OG from './OG.svelte';
 import type { RequestHandler } from '@sveltejs/kit';
-import {componentToImageResponse} from "@ethercorps/sveltekit-og";
+import { componentToImageResponse } from '@ethercorps/sveltekit-og';
 
 const fontFile = await fetch('https://og-playground.vercel.app/inter-latin-ext-700-normal.woff');
 const fontData: ArrayBuffer = await fontFile.arrayBuffer();

package.json

@@ -14,29 +14,31 @@
 		"format": "prettier --plugin-search-dir . --write ."
 	},
 	"devDependencies": {
-		"@playwright/test": "^1.27.1",
+		"@playwright/test": "^1.28.1",
 		"@sveltejs/adapter-auto": "next",
 		"@sveltejs/kit": "next",
 		"@sveltejs/package": "next",
-		"@typescript-eslint/eslint-plugin": "^5.42.1",
-		"@typescript-eslint/parser": "^5.42.1",
-		"eslint": "^8.27.0",
+		"@typescript-eslint/eslint-plugin": "^5.46.0",
+		"@typescript-eslint/parser": "^5.46.0",
+		"eslint": "^8.29.0",
 		"eslint-config-prettier": "^8.5.0",
 		"eslint-plugin-svelte3": "^4.0.0",
-		"prettier": "^2.7.1",
-		"prettier-plugin-svelte": "^2.8.0",
-		"svelte": "^3.53.1",
-		"svelte-check": "^2.9.2",
+		"prettier": "^2.8.1",
+		"prettier-plugin-svelte": "^2.8.1",
+		"svelte": "^3.54.0",
+		"svelte-check": "^2.10.2",
 		"svelte-preprocess": "^4.10.7",
 		"tslib": "^2.4.1",
-		"typescript": "^4.8.4",
-		"vite": "^3.2.3"
+		"typescript": "^4.9.4",
+		"vite": "^3.2.5"
 	},
 	"type": "module",
 	"dependencies": {
-		"@resvg/resvg-wasm": "^2.1.0",
-		"satori": "^0.0.44",
-		"satori-html": "^0.3.0"
+		"@resvg/resvg-js": "^2.2.0",
+		"satori": "^0.0.44"
+	},
+	"peerDependencies": {
+		"svelte": "^3.54.0"
 	},
 	"keywords": [
 		"open graph image",

src/lib/index.ts

@@ -1,20 +1,14 @@
-import { html as toReactNode } from 'satori-html';
-import satori from 'satori';
-import { Resvg, initWasm } from '@resvg/resvg-wasm';
-import type { SatoriOptions } from 'satori';
+import satori, { type SatoriOptions } from 'satori';
+import { Resvg, type ResvgRenderOptions } from '@resvg/resvg-js';
 import type { SvelteComponent } from 'svelte';
+import toReactElement from './toReactElement';
 
-const resSvgWasm = initWasm(fetch('https://sveltekit-og.ethercorps.io/resvg.wasm'));
 const fontFile = await fetch('https://sveltekit-og.ethercorps.io/noto-sans.ttf');
 const fontData: ArrayBuffer = await fontFile.arrayBuffer();
 
-class ImageResponse {
-	constructor(htmlTemplate: string, optionsByUser: ImageResponseOptions) {
+const ImageResponse = async (htmlTemplate: string, optionsByUser: ImageResponseOptions) => {
 	const options = Object.assign({ width: 1200, height: 630, debug: !1 }, optionsByUser);
-		const png = new ReadableStream({
-			async start(a) {
-				await resSvgWasm;
-				const svg = await satori(toReactNode(htmlTemplate), {
+	const svg = await satori(toReactElement(htmlTemplate), {
 		width: options.width,
 		height: options.height,
 		debug: options.debug,
@@ -27,12 +21,16 @@ class ImageResponse {
 			}
 		]
 	});
-				const pngData = new Resvg(svg, { fitTo: { mode: 'width', value: options.width } });
-				a.enqueue(pngData.render().asPng());
-				a.close();
+	const reSvgOptions = {
+		fitTo: {
+			mode: 'width',
+			value: options.width
 		}
-		});
-		return new Response(png, {
+	} as ResvgRenderOptions;
+	const reSvgObject = new Resvg(svg, reSvgOptions);
+	const pngData = await reSvgObject.render().asPng();
+
+	return new Response(pngData, {
 		headers: {
 			'Content-Type': 'image/png',
 			'cache-control': 'public, immutable, no-transform, max-age=31536000',
@@ -42,15 +40,16 @@ class ImageResponse {
 		status: options.status,
 		statusText: options.statusText
 	});
-	}
-}
+};
 
-class componentToImageResponse {
-	constructor(component: typeof SvelteComponent, props = {}, optionsByUser: ImageResponseOptions) {
+const componentToImageResponse = (
+	component: typeof SvelteComponent,
+	props = {},
+	optionsByUser: ImageResponseOptions
+) => {
 	const htmlTemplate = componentToMarkup(component, props);
-		return new ImageResponse(htmlTemplate, optionsByUser);
-	}
-}
+	return ImageResponse(htmlTemplate, optionsByUser);
+};
 
 const componentToMarkup = (component: typeof SvelteComponent, props = {}) => {
 	const SvelteRenderedMarkup = (component as any).render(props);
@@ -75,4 +74,6 @@ type ImageOptions = {
 	) => Promise<SatoriOptions['fonts'] | string | undefined>;
 };
 
-export { componentToImageResponse, ImageResponse };
+type ImageResponseType = typeof ImageResponse;
+
+export { componentToImageResponse, ImageResponse, toReactElement, satori, type ImageResponseType };

src/lib/toReactElement.ts

@@ -0,0 +1,107 @@
+import { parse, walk } from 'svelte/compiler';
+import type { Ast } from 'svelte/types/compiler/interfaces';
+
+/* Start of code from satori-html for cssToObject converter*/
+const camelize = (ident: string) => ident.replace(/-([a-z])/g, (_, char) => char.toUpperCase());
+const cssToObject = (str: string) => {
+	const obj: Record<string, string> = {};
+	let t = 0;
+	let pair = ['', ''];
+	const flags: Record<string, number> = {};
+	for (const c of str) {
+		if (!flags['('] && c === ':') {
+			t = 1;
+		} else if (c === ';') {
+			const [decl = '', value = ''] = pair;
+			obj[camelize(decl.trim())] = value.trim();
+			t = 0;
+			pair = ['', ''];
+		} else {
+			pair[t] += c;
+			switch (c) {
+				case '(': {
+					flags[c]++;
+					break;
+				}
+				case ')': {
+					flags['(']--;
+					break;
+				}
+			}
+		}
+	}
+	const [decl = '', value = ''] = pair;
+	if (decl.trim() && value.trim()) {
+		obj[camelize(decl.trim())] = value.trim();
+	}
+
+	return obj;
+};
+const nodeMap = new WeakMap();
+interface VNode {
+	type: string;
+	props: {
+		style?: Record<string, any>;
+		children?: string | VNode | VNode[];
+		[prop: string]: any;
+	};
+}
+const root: VNode = {
+	type: 'div',
+	props: {
+		style: {
+			display: 'flex',
+			flexDirection: 'column',
+			width: '100%',
+			height: '100%'
+		},
+		children: []
+	}
+};
+/* End of satori-html */
+
+const toReactElement = (htmlString: string): VNode => {
+	const svelteAST: Ast = parse(htmlString);
+	walk(svelteAST, {
+		enter(node: any, parent: any, prop: any, index: any) {
+			let newNode: any = {};
+			if (node.type === 'Fragment') {
+				nodeMap.set(node, root);
+			} else if (node.type === 'Element') {
+				newNode.type = node.name;
+				const { ...props } = node.attributes;
+				if (node.attributes.length > 0) {
+					node.attributes.forEach((attribute: any) => {
+						if (attribute.name === 'style') {
+							props['style'] = cssToObject(attribute.value[0].data) as any;
+						} else props[attribute.name] = attribute.value[0].data as any;
+					});
+					delete props[0];
+				}
+				props.children = [] as unknown as string;
+				Object.assign(newNode, { props });
+				nodeMap.set(node, newNode);
+				if (parent) {
+					const newParent = nodeMap.get(parent);
+					newParent.props.children[index] = newNode;
+				}
+			} else if (node.type === 'Text') {
+				newNode = node.data.trim();
+				if (newNode) {
+					if (parent && parent.type !== 'Attribute') {
+						const newParent = nodeMap.get(parent);
+						if (parent.children.length === 1) {
+							newParent.props.children = newNode;
+						} else {
+							newParent.props.children[index] = newNode;
+						}
+					}
+				}
+			}
+		}
+	});
+
+	return root;
+};
+
+export default toReactElement;

src/routes/+server.ts

@@ -25,7 +25,7 @@ const fontData400: ArrayBuffer = await fontFile400.arrayBuffer();
 const fontData700: ArrayBuffer = await fontFile700.arrayBuffer();
 
 export const GET: RequestHandler = async () => {
-	return new ImageResponse(template, {
+	return await ImageResponse(template, {
 		height: 250,
 		width: 500,
 		fonts: [

src/routes/component-og/+server.ts

@@ -6,7 +6,7 @@ const fontFile = await fetch('https://og-playground.vercel.app/inter-latin-ext-7
 const fontData: ArrayBuffer = await fontFile.arrayBuffer();
 
 export const GET: RequestHandler = async () => {
-	return new componentToImageResponse(
+	return await componentToImageResponse(
 		OG,
 		{ text: 'Ready to dive in?', spanText: 'Start your free trial today.' },
 		{

src/routes/new/+server.ts

@@ -0,0 +1,44 @@
+import { ImageResponse } from '$lib';
+import type { RequestHandler } from '@sveltejs/kit';
+
+const template = `
+ <div tw="bg-gray-50 flex w-full h-full items-center justify-center">
+    <div tw="flex flex-col md:flex-row w-full py-12 px-4 md:items-center justify-between p-8">
+      <h2 tw="flex flex-col text-3xl sm:text-4xl font-bold tracking-tight text-gray-900 text-left">
+        <span>Ready to dive in?</span>
+        <span tw="text-indigo-600">Start your free trial today.</span>
+      </h2>
+      <div tw="mt-8 flex md:mt-0">
+        <div tw="flex rounded-md shadow">
+          <a href="#" tw="flex items-center justify-center rounded-md border border-transparent bg-indigo-600 px-5 py-3 text-base font-medium text-white">Get started</a>
+        </div>
+        <div tw="ml-3 flex rounded-md shadow">
+          <a href="#" tw="flex items-center justify-center rounded-md border border-transparent bg-white px-5 py-3 text-base font-medium text-indigo-600">Learn more</a>
+        </div>
+      </div>
+    </div>
+  </div>
+`;
+const fontFile400 = await fetch('https://og-playground.vercel.app/inter-latin-ext-400-normal.woff');
+const fontFile700 = await fetch('https://og-playground.vercel.app/inter-latin-ext-700-normal.woff');
+const fontData400: ArrayBuffer = await fontFile400.arrayBuffer();
+const fontData700: ArrayBuffer = await fontFile700.arrayBuffer();
+
+export const GET: RequestHandler = async () => {
+	return await ImageResponse(template, {
+		height: 250,
+		width: 500,
+		fonts: [
+			{
+				name: 'Inter Latin',
+				data: fontData400,
+				weight: 400
+			},
+			{
+				name: 'Inter Latin',
+				data: fontData700,
+				weight: 700
+			}
+		]
+	});
+};

src/routes/test/+page.server.js

@@ -0,0 +1,43 @@
+import toReactElement from '$lib/toReactElement';
+import satori from 'satori';
+const htmlString = `
+        <div tw="bg-gray-50 flex w-full">
+        <div tw="flex flex-col md:flex-row w-full py-12 px-4 md:items-center justify-between p-8">
+          <h2 tw="flex flex-col text-3xl sm:text-4xl font-bold tracking-tight text-gray-900 text-left">
+            <span>Ready to dive in?</span>
+            <span tw="text-indigo-600">Start your free trial today.</span>
+          </h2>
+          <div tw="mt-8 flex md:mt-0">
+            <div tw="flex rounded-md shadow">
+              <a tw="flex items-center justify-center rounded-md border border-transparent bg-indigo-600 px-5 py-3 text-base font-medium text-white">Get started</a>
+            </div>
+            <div tw="ml-3 flex rounded-md shadow">
+              <a tw="flex items-center justify-center rounded-md border border-transparent bg-white px-5 py-3 text-base font-medium text-indigo-600">Learn more</a>
+            </div>
+          </div>
+        </div>
+        </div>
+        `;
+const newNode = toReactElement(htmlString);
+
+/** @type {import('./$types').PageServerLoad} */
+export async function load() {
+	const fontFile400 = await fetch(
+		'https://og-playground.vercel.app/inter-latin-ext-400-normal.woff'
+	);
+	const fontData400 = await fontFile400.arrayBuffer();
+	const svg = await satori(newNode, {
+		height: 350,
+		width: 500,
+		fonts: [
+			{
+				name: 'sans serif',
+				data: fontData400,
+				style: 'normal',
+				weight: 700
+			}
+		]
+	});
+
+	return { svg };
+}

src/routes/test/+page.svelte

@@ -0,0 +1,5 @@
+<script lang="ts">
+	export let data;
+</script>
+
+{@html data.svg}

vite.config.ts

@@ -2,7 +2,10 @@ import { sveltekit } from '@sveltejs/kit/vite';
 import type { UserConfig } from 'vite';
 
 const config: UserConfig = {
-	plugins: [sveltekit()]
+	plugins: [sveltekit()],
+	define: {
+		_a: 'undefined'
+	}
 };
 
 export default config;