Fix watch not processing original files

rollup/rollup-watch#38

lib/index.js

@@ -14,15 +14,16 @@ function createPreprocessor(preconfig, config, emitter, logger) {
 	}
 
 	return async function preprocess(original, file, done) {
-		const location = path.relative(config.basePath, file.path)
+		const originalPath = file.originalPath
+		const location = path.relative(config.basePath, originalPath)
 		try {
 			const options = Object.assign({}, config.rollupPreprocessor, preconfig.options, {
-				input: file.path,
-				cache: cache.get(file.path),
+				input: originalPath,
+				cache: cache.get(originalPath),
 			})
 
 			const bundle = await rollup.rollup(options)
-			cache.set(file.path, bundle.cache)
+			cache.set(originalPath, bundle.cache)
 
 			if (watcher) {
 				const [entry, ...dependencies] = bundle.watchFiles
@@ -43,7 +44,7 @@ function createPreprocessor(preconfig, config, emitter, logger) {
 					 * for processors that have alternate source file extensions,
 					 * make sure to use the output rollup file name
 					 */
-					const parsedPath = path.parse(file.path)
+					const parsedPath = path.parse(originalPath)
 					file.path = `${parsedPath.dir}/${result.fileName}`
 
 					const processed =