feat: add transformInclude

Author: KeJunMao

src/core/index.ts

@@ -1,4 +1,4 @@
-export * from "./context"
-export * from "./directive"
-export * from "./directives"
-export * from "./unplugin"
+export * from './context'
+export * from './directive'
+export * from './directives'
+export * from './unplugin'

src/core/unplugin.ts

@@ -11,6 +11,9 @@ export const unpluginFactory: UnpluginFactory<UserOptions | undefined> = (
     name: 'unplugin-preprocessor-directives',
     enforce: 'pre',
     transform: (code, id) => ctx.transform(code, id),
+    transformInclude(id) {
+      return ctx.filter(id)
+    },
     vite: {
       configResolved(config) {
         ctx.env = { ...ctx.env, ...config.env }