remove unused preprocessor option

src/index.ts

@@ -10,7 +10,7 @@ import { SourceMap } from 'magic-string';
 const version = '__VERSION__';
 
 function normalizeOptions(options: CompileOptions): CompileOptions {
-	let normalizedOptions = assign({ generate: 'dom', preprocessor: false }, options);
+	let normalizedOptions = assign({ generate: 'dom' }, options);
 	const { onwarn, onerror } = normalizedOptions;
 	normalizedOptions.onwarn = onwarn
 		? (warning: Warning) => onwarn(warning, defaultOnwarn)

src/interfaces.ts

@@ -62,7 +62,6 @@ export interface CompileOptions {
 
 	onerror?: (error: Error) => void;
 	onwarn?: (warning: Warning) => void;
-	preprocessor?: ((raw: string) => string) | false ;
 }
 
 export interface GenerateOptions {