Revert "fix: append stylesheet only"

This reverts commit a2a88ec.

Author: fkhadra

tsup.config.ts

@@ -4,11 +4,21 @@ const injectFunc = `
 function injectStyle(css) {
   if (!css || typeof document === 'undefined') return
 
-  let head = document.head || document.getElementsByTagName('head')[0]
-  let style = document.createElement('style')
+  const head = document.head || document.getElementsByTagName('head')[0]
+  const style = document.createElement('style')
+  style.type = 'text/css'
+          
+  if(head.firstChild) {
+    head.insertBefore(style, head.firstChild)
+  } else {
+    head.appendChild(style)
+  }
 
-  head.appendChild(style)
-  style.appendChild(document.createTextNode(css))
+  if(style.styleSheet) {
+    style.styleSheet.cssText = css
+  } else {
+    style.appendChild(document.createTextNode(css))
+  }
 }
 `;