Refactor

src/corePlugins.js

@@ -77,21 +77,11 @@ export let variantPlugins = {
       [
         'visited',
         ({ container }) => {
-          let toRemove = ['--tw-text-opacity', '--tw-border-opacity', '--tw-bg-opacity']
-
-          container.walkDecls((decl) => {
-            if (toRemove.includes(decl.prop)) {
-              decl.remove()
-
-              return
-            }
-
-            for (const varName of toRemove) {
-              if (decl.value.includes(`/ var(${varName})`)) {
-                decl.value = decl.value.replace(`/ var(${varName})`, '')
-              }
-            }
-          })
+          removeAlphaVariables(container, [
+            '--tw-text-opacity',
+            '--tw-border-opacity',
+            '--tw-bg-opacity',
+          ])
 
           return '&:visited'
         },

src/util/removeAlphaVariables.js

@@ -0,0 +1,24 @@
+/**
+ * This function removes any uses of CSS variables used as an alpha channel
+ *
+ * This is required for selectors like `:visited` which do not allow
+ * changes in opacity or external control using CSS variables.
+ *
+ * @param {import('postcss').Container} container
+ * @param {string[]} toRemove
+ */
+export function removeAlphaVariables(container, toRemove) {
+  container.walkDecls((decl) => {
+    if (toRemove.includes(decl.prop)) {
+      decl.remove()
+
+      return
+    }
+
+    for (const varName of toRemove) {
+      if (decl.value.includes(`/ var(${varName})`)) {
+        decl.value = decl.value.replace(`/ var(${varName})`, '')
+      }
+    }
+  })
+}