encoding - more tests

build/lib/compilation.ts

@@ -54,7 +54,7 @@ function createCompile(src: string, build: boolean, emitError?: boolean) {
 		const input = es.through();
 		const output = input
 			.pipe(utf8Filter)
-			.pipe(bom())
+			.pipe(bom()) // this is required to preserve BOM in test files that loose it otherwise
 			.pipe(utf8Filter.restore)
 			.pipe(tsFilter)
 			.pipe(util.loadSourcemaps())