feat: use JSON script for serializing

README.md

@@ -96,13 +96,17 @@ export interface Props {
 
 ## What's happening here?
 
-For simple applications with just a few components, this is a quick pattern to embed serialized information into your HTML. The `Serialize` component will do this for you, currently by using a hidden `textarea` element to hold the string.
+This is a quick and easy pattern to embed serialized information into your HTML and make it available in the client-side script.
 
-The `deserialize()` function can then parse the value string for use in your client script. You have to manage the IDs yourself (i.e., make sure they are unique) and understand that the `deserialize()` function will crawl the whole document incurring some performance cost.
+The `Serialize` component will write the data as JSON wrapped in a `<script type="application/json">` element to hold the string.
 
-Another approach we see in other frameworks is embedding JSON in your HTML and the frameworks themselves managing/tracking the IDs for you, but we don't have access to this in Astro as we are not really shipping a framework to the browser. That's nice and ideal (in my opinion), but we do have to manage things ourselves.
+The `deserialize()` function can then parse the value string for use in your client script.
 
-There is a pattern [given in the Astro docs](https://docs.astro.build/en/guides/client-side-scripts/#pass-frontmatter-variables-to-scripts) to use a Custom Element that takes a `data-` prop which properly protects the scope of your component. That is a good pattern to follow for complex applications that don't use UI frameworks.
+There is also a pattern [given in the Astro docs](https://docs.astro.build/en/guides/client-side-scripts/#pass-frontmatter-variables-to-scripts) to use a Custom Element that takes a `data-` prop which properly protects the scope of your component. That is a good pattern to follow for complex applications that don't use UI frameworks.
+
+## Trade-Off
+
+You have to manage the IDs yourself (i.e., make sure they are unique) and understand that the `deserialize()` function will crawl the whole document incurring a minimal performance cost depending on how big your HTML is.
 
 ## Reporting Issues
 

src/Serialize.astro

@@ -14,4 +14,4 @@ export interface Props {
 const {id, data} = Astro.props;
 ---
 
-<textarea hidden id={id}>{JSON.stringify(data)}</textarea>
+<script type="application/json" id={id} set:html={JSON.stringify(data)}></script>

src/deserialize.ts

@@ -1,8 +1,8 @@
 export function deserialize<T = any>(id: string): T {
-    const element = document.querySelector<HTMLTextAreaElement>(`#${id}`);
+    const element = document.querySelector<HTMLScriptElement>(`#${id}`);
 
-    if (element?.value)
-        return JSON.parse(element.value)
+    if (element?.innerText)
+        return JSON.parse(element.innerText)
         
     throw Error(`The call deserialize('${id}') did not find any data.
     Check that the following are correct: