diff --git a/test/assets/output/tocompile.js b/test/assets/output/tocompile.js
index 4b7f7ba..956e91f 100644
--- a/test/assets/output/tocompile.js
+++ b/test/assets/output/tocompile.js
@@ -1,11 +1,3 @@
-var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
-    return new (P || (P = Promise))(function (resolve, reject) {
-        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
-        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
-        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments || [])).next());
-    });
-};
 console.log('test');
 console.log('test2');
 class test2 {
@@ -14,7 +6,7 @@ class test2 {
         console.log('hi');
     }
 }
-const run = () => __awaiter(this, void 0, void 0, function* () {
+const run = async () => {
     return 'hi';
-});
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoidG9jb21waWxlLmpzIiwic291cmNlUm9vdCI6IiIsInNvdXJjZXMiOlsiLi4vdG9jb21waWxlLnRzIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7Ozs7Ozs7O0FBQUEsT0FBTyxDQUFDLEdBQUcsQ0FBQyxNQUFNLENBQUMsQ0FBQztBQUNwQixPQUFPLENBQUMsR0FBRyxDQUFDLE9BQU8sQ0FBQyxDQUFDO0FBQ3JCLE1BQU0sS0FBSztJQUVUO1FBREEsU0FBSSxHQUFhLEVBQUUsQ0FBQztRQUVsQixPQUFPLENBQUMsR0FBRyxDQUFDLElBQUksQ0FBQyxDQUFDO0lBQ3BCLENBQUM7Q0FDRjtBQUVELE1BQU0sR0FBRyxHQUFHLEdBQTBCLEVBQUU7SUFDdEMsT0FBTyxJQUFJLENBQUM7QUFDZCxDQUFDLENBQUEsQ0FBQyJ9
\ No newline at end of file
+};
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoidG9jb21waWxlLmpzIiwic291cmNlUm9vdCI6IiIsInNvdXJjZXMiOlsiLi4vdG9jb21waWxlLnRzIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiJBQUFBLE9BQU8sQ0FBQyxHQUFHLENBQUMsTUFBTSxDQUFDLENBQUM7QUFDcEIsT0FBTyxDQUFDLEdBQUcsQ0FBQyxPQUFPLENBQUMsQ0FBQztBQUNyQixNQUFNLEtBQUs7SUFFVDtRQURBLFNBQUksR0FBYSxFQUFFLENBQUM7UUFFbEIsT0FBTyxDQUFDLEdBQUcsQ0FBQyxJQUFJLENBQUMsQ0FBQztJQUNwQixDQUFDO0NBQ0Y7QUFFRCxNQUFNLEdBQUcsR0FBRyxLQUFLLElBQXFCLEVBQUU7SUFDdEMsT0FBTyxJQUFJLENBQUM7QUFDZCxDQUFDLENBQUMifQ==
\ No newline at end of file
diff --git a/ts/tsbuild.classes.compiler.ts b/ts/tsbuild.classes.compiler.ts
index 08a7b29..0477774 100644
--- a/ts/tsbuild.classes.compiler.ts
+++ b/ts/tsbuild.classes.compiler.ts
@@ -14,9 +14,9 @@ export const compilerOptionsDefault: CompilerOptions = {
   noEmitOnError: true,
   outDir: 'dist/',
   module: plugins.typescript.ModuleKind.CommonJS,
-  lib: ['lib.es2016.d.ts', 'lib.es2017.d.ts'],
+  lib: ['lib.es2017.d.ts'],
   noImplicitAny: false,
-  target: plugins.typescript.ScriptTarget.ES2015
+  target: plugins.typescript.ScriptTarget.ES2017
 };
 
 export const compilerOptionsWebDefault: CompilerOptions = {