Handle undefined in addition to nulls

Author: philipp-spiess

packages/@tailwindcss-vite/src/index.ts

@@ -373,7 +373,7 @@ class Root {
     let inputPath = idToPath(this.id)
     let inputBase = path.dirname(path.resolve(inputPath))
 
-    if (this.compiler === null || this.scanner === null || this.rebuildStrategy === 'full') {
+    if (!this.compiler || !this.scanner || this.rebuildStrategy === 'full') {
       this.rebuildStrategy = 'incremental'
       clearRequireCache(Array.from(this.dependencies))
       this.dependencies = new Set([idToPath(inputPath)])
@@ -417,12 +417,6 @@ class Root {
       })
     }
 
-    if (!this.scanner || !this.compiler) {
-      // TypeScript does not properly refine the scanner and compiler properties
-      // (even when extracted into a variable)
-      throw new Error('Tailwind CSS compiler is not initialized.')
-    }
-
     // This should not be here, but right now the Vite plugin is setup where we
     // setup a new scanner and compiler every time we request the CSS file
     // (regardless whether it actually changed or not).