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docs: add clarification on static template expressions #15292

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docs: add clarification on static template expressions #15292

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19 changes: 19 additions & 0 deletions documentation/docs/03-template-syntax/01-basic-markup.md
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Expand Up @@ -158,6 +158,25 @@ Curly braces can be included in a Svelte template by using their [HTML entity](h

If you're using a regular expression (`RegExp`) [literal notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#literal_notation_and_constructor), you'll need to wrap it in parentheses.

> [!NOTE] Svelte statically analyzes your code to determine what is actually reactive. As a result, if a text or attribute expression does not contain:
> - An object property
> - A function call
> - A reference to a reactive variable
>
> Then Svelte will treat it as a static expression that does not require updates. This means that this sort of statement would be treated as static, and would never update:
> ```svelte
> <script>
> let count = $state(0);
> let thing = {
> toString() {
> return count;
> }
> };
> </script>
> <button onclick={() => count++}>Count is {thing}</button>
> ```
> In the above case, if you wanted the statement to be reactive, you would have to append `.toString()` to the expression (to turn `{thing}` into `{thing.toString()}`).

<!-- prettier-ignore -->
```svelte
<h1>Hello {name}!</h1>
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