Lucide won't render `data-lucide` if inside `<template>`

[dotfrag]

Package

• [X] lucide
• [ ] lucide-angular
• [ ] lucide-flutter
• [ ] lucide-preact
• [ ] lucide-react
• [ ] lucide-react-native
• [ ] lucide-solid
• [ ] lucide-svelte
• [ ] lucide-vue
• [ ] lucide-vue-next
• [ ] Figma plugin
• [ ] source/main
• [ ] other/not relevant

Version

0.460.0

Can you reproduce this in the latest version?

• [X] Yes
• [ ] No

Browser

• [X] Chrome/Chromium
• [X] Firefox
• [ ] Safari
• [ ] Edge
• [ ] iOS Safari
• [ ] Opera
• [ ] Other/not relevant

Operating system

• [ ] Windows
• [X] Linux
• [ ] macOS
• [ ] ChromeOS
• [ ] iOS
• [ ] Android
• [ ] Other/not relevant

Description

I'm using the Content Template element (<template>) to render parts of an HTML form that I use as a template (duh) within JavaScript. Elements with data-lucide inside the template tag do not render.

Steps to reproduce

1. Minimal setup from guide (all icons)
2. The following input HTML:

   <div>
      <template><i data-lucide="trash-2" class="size-6 stroke-red-600 mx-auto"></i></template>
      <i data-lucide="trash-2" class="size-6 stroke-red-600 mx-auto"></i>
   </div>

3. Results in:

       <div>
         <template><i data-lucide="trash-2" class="size-6 stroke-red-600 mx-auto"></i></template>
         <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" data-lucide="trash-2" class="lucide lucide-trash-2 size-6 stroke-red-600 mx-auto"><path d="M3 6h18"></path><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"></path><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"></path><line x1="10" x2="10" y1="11" y2="17"></line><line x1="14" x2="14" y1="11" y2="17"></line></svg>
   </div>

Checklist

• [X] I have searched if someone has submitted a similar issue before and there weren't any. (Please make sure to also search closed issues, as this issue might already have been resolved.)

[dotfrag]

I had a quick look at the code. I am not experienced with JS, but I'll try to help:

It seems that lucide searches for elements using querySelectorAll:

https://github.com/lucide-icons/lucide/blob/49070b4d1f2cb8e32e222ad9ef1826258cf3a7c1/packages/lucide/src/lucide.ts#L19-L22

querySelectorAll doesn't return <template> elements because they are not real elements. However, you can explicitly query them and their content with the following:

// Test to see if the browser supports the HTML template element by checking
// for the presence of the template element's content attribute.
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template#examples
if ("content" in document.createElement("template")) {
  document.querySelectorAll('template').forEach((template) =>
    template.content.querySelectorAll('[data-lucide]').forEach((element) =>
      console.log(element)
    )
  );
}

[dotfrag]

As I said, I'm not experienced enough to contribute with a PR. For anyone who encounters this, you might be able to solve it like it did:

Use pnpm patch and edit the code as below:

diff --git a/dist/esm/lucide.js b/dist/esm/lucide.js
index xxx..xxx 100644
--- a/dist/esm/lucide.js
+++ b/dist/esm/lucide.js
@@ -1562,6 +1562,15 @@ const createIcons = ({ icons = {}, nameAttr = "data-lucide", attrs = {} } = {})
   Array.from(elementsToReplace).forEach(
     (element) => replaceElement(element, { nameAttr, icons, attrs })
   );
+  if ("content" in document.createElement("template")) {
+    const templateElements = document.querySelectorAll('template');
+    templateElements.forEach((template) => {
+      const templateContentElementsToReplace = template.content.querySelectorAll(`[${nameAttr}]`);
+      Array.from(templateContentElementsToReplace).forEach(
+        (element) => replaceElement(element, { nameAttr, icons, attrs })
+      );
+    })
+  }
   if (nameAttr === "data-lucide") {
     const deprecatedElements = document.querySelectorAll("[icon-name]");
     if (deprecatedElements.length > 0) {

If you are using Node with npm, there's patch-package.

If you are using bun, there's bun patch, if you are using Deno I have no idea, sorry.