create an s-tag conditional in typescript

To create an s-tag conditional in TypeScript, you can use a template engine such as Svelte, which enables you to write reactive components. Svelte uses an s-tag syntax to mark which part of a template should be reactive by prefixing the tag with the s: attribute.

Here is an example code snippet of an s-tag conditional in Svelte:

<!-- App.svelte -->
<script>
  let isLoggedIn = true;
</script>

{#if isLoggedIn}
  <h1>Welcome!</h1>
{:else}
  <p>Please Login</p>
{/if}
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In this example, the code checks if isLoggedIn is true, if it is, then the template renders the <h1> tag that says "Welcome!". If isLoggedIn is false, then the template renders the <p> tag that says "Please Login".

The s-tag :else is used to render content when the condition is false. Svelte also has other built-in s-tags such as :else if and :each for iterating over arrays.

By using s-tags and reactive programming with Svelte, you can create dynamic templates that update in response to changing data.