diff --git a/lib/values/function.ts b/lib/values/function.ts
index 872ce83..0bd101b 100644
--- a/lib/values/function.ts
+++ b/lib/values/function.ts
@@ -14,6 +14,7 @@ interface FunctionConstructor extends Function {
     (...args: string[]): (...args: any[]) => any;
     new (...args: string[]): (...args: any[]) => any;
     prototype: Function;
+    async<ArgsT extends any[], RetT>(func: (await: <T>(val: T) => Awaited<T>, args: ArgsT) => RetT): Promise<RetT>;
 }
 
 interface CallableFunction extends Function {
@@ -75,4 +76,10 @@ setProps(Function.prototype, {
     toString() {
         return 'function (...) { ... }';
     },
-});
\ No newline at end of file
+});
+setProps(Function, {
+    async(func) {
+        if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
+        return internals.makeAsync(func);
+    }
+})
\ No newline at end of file
diff --git a/src/me/topchetoeu/jscript/Main.java b/src/me/topchetoeu/jscript/Main.java
index a13ad08..1edc5a7 100644
--- a/src/me/topchetoeu/jscript/Main.java
+++ b/src/me/topchetoeu/jscript/Main.java
@@ -4,6 +4,8 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.Map;
 
 import me.topchetoeu.jscript.engine.Engine;
@@ -12,7 +14,6 @@ import me.topchetoeu.jscript.events.Observer;
 import me.topchetoeu.jscript.exceptions.EngineException;
 import me.topchetoeu.jscript.exceptions.SyntaxException;
 import me.topchetoeu.jscript.polyfills.PolyfillEngine;
-import me.topchetoeu.jscript.polyfills.TypescriptEngine;
 
 public class Main {
     static Thread task;
@@ -52,7 +53,7 @@ public class Main {
 
     public static void main(String args[]) {
         var in = new BufferedReader(new InputStreamReader(System.in));
-        engine = new TypescriptEngine(new File("."));
+        engine = new PolyfillEngine(new File("."));
         var scope = engine.global().globalChild();
         var exited = new boolean[1];
 
@@ -61,6 +62,15 @@ public class Main {
             task.interrupt();
             throw new InterruptedException();
         });
+        scope.define("go", ctx -> {
+            try {
+                var func = engine.compile(scope, "do.js", new String(Files.readAllBytes(Path.of("do.js"))));
+                return func.call(ctx);
+            }
+            catch (IOException e) {
+                throw new EngineException("Couldn't open do.js");
+            }
+        });
 
         task = engine.start();
         var reader = new Thread(() -> {
@@ -68,7 +78,7 @@ public class Main {
                 while (true) {
                     try {
                         var raw = in.readLine();
-    
+
                         if (raw == null) break;
                         engine.pushMsg(false, scope, Map.of(), "<stdio>", raw, null).toObservable().once(valuePrinter);
                     }
diff --git a/src/me/topchetoeu/jscript/engine/frame/CodeFrame.java b/src/me/topchetoeu/jscript/engine/frame/CodeFrame.java
index 5264f8d..8548535 100644
--- a/src/me/topchetoeu/jscript/engine/frame/CodeFrame.java
+++ b/src/me/topchetoeu/jscript/engine/frame/CodeFrame.java
@@ -26,6 +26,7 @@ public class CodeFrame {
     public final Object thisArg;
     public final Object[] args;
     public final List<Object> stack = new ArrayList<>();
+    public final List<TryContext> tryCtxs = new ArrayList<>();
     public final CodeFunction function;
 
     public int codePtr = 0;
@@ -47,7 +48,7 @@ public class CodeFrame {
         stack.add(stack.size(), Values.normalize(val));
     }
 
-    private void cleanup(CallContext ctx) {
+    public void cleanup(CallContext ctx) {
         stack.clear();
         codePtr = 0;
         debugCmd = null;
@@ -61,7 +62,7 @@ public class CodeFrame {
         var debugState = ctx.getData(Engine.DEBUG_STATE_KEY);
 
         if (debugCmd == null) {
-            if (ctx.getData(STACK_N_KEY, 0) >= ctx.addData(MAX_STACK_KEY, 1000))
+            if (ctx.getData(STACK_N_KEY, 0) >= ctx.addData(MAX_STACK_KEY, 100000))
                 throw EngineException.ofRange("Stack overflow!");
             ctx.changeData(STACK_N_KEY);
 
@@ -72,7 +73,10 @@ public class CodeFrame {
         }
 
         if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
+        if (codePtr < 0 || codePtr >= function.body.length) return null;
+
         var instr = function.body[codePtr];
+
         var loc = instr.location;
         if (loc != null) prevLoc = loc;
 
@@ -92,73 +96,80 @@ public class CodeFrame {
         }
 
         try {
-            var res = Runners.exec(debugCmd, instr, this, ctx);
-            if (res != Runners.NO_RETURN) cleanup(ctx);
-            return res;
+            return Runners.exec(debugCmd, instr, this, ctx);
         }
         catch (EngineException e) {
-            cleanup(ctx);
             throw e.add(function.name, prevLoc);
         }
-        catch (RuntimeException e) {
-            cleanup(ctx);
-            throw e;
-        }
     }
 
     public Object run(CallContext ctx) throws InterruptedException {
-        var debugState = ctx.getData(Engine.DEBUG_STATE_KEY);
-        DebugCommand command = ctx.getData(STOP_AT_START_KEY, false) ? DebugCommand.STEP_OVER : DebugCommand.NORMAL;
-
-        if (ctx.getData(STACK_N_KEY, 0) >= ctx.addData(MAX_STACK_KEY, 200)) throw EngineException.ofRange("Stack overflow!");
-        ctx.changeData(STACK_N_KEY);
-
-        if (debugState != null) debugState.pushFrame(this);
-
-        Location loc = null;
-
         try {
-            while (codePtr >= 0 && codePtr < function.body.length) {
-                var _loc = function.body[codePtr].location;
-                if (_loc != null) loc = _loc;
-
-                if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
-                var instr = function.body[codePtr];
-
-                if (debugState != null && loc != null) {
-                    if (
-                        instr.type == Type.NOP && instr.match("debug") ||
-                        (
-                            (command == DebugCommand.STEP_INTO || command == DebugCommand.STEP_OVER) &&
-                            ctx.getData(STEPPING_TROUGH_KEY, false)
-                        ) ||
-                        debugState.breakpoints.contains(loc)
-                    ) {
-                        ctx.setData(STEPPING_TROUGH_KEY, true);
-
-                        debugState.breakpointNotifier.next(new BreakpointData(loc, ctx));
-                        command = debugState.commandNotifier.toAwaitable().await();
-                        if (command == DebugCommand.NORMAL) ctx.setData(STEPPING_TROUGH_KEY, false);
-                    }
-                }
-
-                try {
-                    var res = Runners.exec(command, instr, this, ctx);
-                    if (res != Runners.NO_RETURN) return res;
-                }
-                catch (EngineException e) {
-                    throw e.add(function.name, instr.location);
-                }
+            while (true) {
+                var res = next(ctx);
+                if (res != Runners.NO_RETURN) return res;
             }
-            return null;
         }
-        // catch (StackOverflowError e) {
-        //     e.printStackTrace();
-        //     throw EngineException.ofRange("Stack overflow!").add(function.name, loc);
-        // }
         finally {
-            ctx.changeData(STACK_N_KEY, -1);
+            cleanup(ctx);
         }
+
+
+        // var debugState = ctx.getData(Engine.DEBUG_STATE_KEY);
+        // DebugCommand command = ctx.getData(STOP_AT_START_KEY, false) ? DebugCommand.STEP_OVER : DebugCommand.NORMAL;
+
+        // if (ctx.getData(STACK_N_KEY, 0) >= ctx.addData(MAX_STACK_KEY, 200)) throw EngineException.ofRange("Stack overflow!");
+        // ctx.changeData(STACK_N_KEY);
+
+        // if (debugState != null) debugState.pushFrame(this);
+
+        // Location loc = null;
+
+
+        // Location loc = null;
+
+        // try {
+        //     while (codePtr >= 0 && codePtr < function.body.length) {
+        //         var _loc = function.body[codePtr].location;
+        //         if (_loc != null) loc = _loc;
+
+        //         if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
+        //         var instr = function.body[codePtr];
+
+        //         if (debugState != null && loc != null) {
+        //             if (
+        //                 instr.type == Type.NOP && instr.match("debug") ||
+        //                 (
+        //                     (command == DebugCommand.STEP_INTO || command == DebugCommand.STEP_OVER) &&
+        //                     ctx.getData(STEPPING_TROUGH_KEY, false)
+        //                 ) ||
+        //                 debugState.breakpoints.contains(loc)
+        //             ) {
+        //                 ctx.setData(STEPPING_TROUGH_KEY, true);
+
+        //                 debugState.breakpointNotifier.next(new BreakpointData(loc, ctx));
+        //                 command = debugState.commandNotifier.toAwaitable().await();
+        //                 if (command == DebugCommand.NORMAL) ctx.setData(STEPPING_TROUGH_KEY, false);
+        //             }
+        //         }
+
+        //         try {
+        //             var res = Runners.exec(command, instr, this, ctx);
+        //             if (res != Runners.NO_RETURN) return res;
+        //         }
+        //         catch (EngineException e) {
+        //             throw e.add(function.name, instr.location);
+        //         }
+        //     }
+        //     return null;
+        // }
+        // // catch (StackOverflowError e) {
+        // //     e.printStackTrace();
+        // //     throw EngineException.ofRange("Stack overflow!").add(function.name, loc);
+        // // }
+        // finally {
+        //     ctx.changeData(STACK_N_KEY, -1);
+        // }
     }
 
     public CodeFrame(Object thisArg, Object[] args, CodeFunction func) {
diff --git a/src/me/topchetoeu/jscript/engine/modules/ModuleManager.java b/src/me/topchetoeu/jscript/engine/modules/ModuleManager.java
index e6e8645..4def5e1 100644
--- a/src/me/topchetoeu/jscript/engine/modules/ModuleManager.java
+++ b/src/me/topchetoeu/jscript/engine/modules/ModuleManager.java
@@ -56,7 +56,7 @@ public class ModuleManager {
             if (realName == null) return null;
             if (cache.containsKey(realName)) return cache.get(realName);
             var mod = files.getModule(cwd, name);
-            // cache.put(mod.name(), mod);
+            cache.put(mod.name(), mod);
             mod.execute(ctx);
             return mod;
         }
@@ -66,7 +66,7 @@ public class ModuleManager {
             if (realName == null) continue;
             if (cache.containsKey(realName)) return cache.get(realName);
             var mod = provider.getModule(cwd, name);
-            // cache.put(mod.name(), mod);
+            cache.put(mod.name(), mod);
             mod.execute(ctx);
             return mod;
         }
diff --git a/src/me/topchetoeu/jscript/engine/values/NativeFunction.java b/src/me/topchetoeu/jscript/engine/values/NativeFunction.java
index 60c8691..c6a8be2 100644
--- a/src/me/topchetoeu/jscript/engine/values/NativeFunction.java
+++ b/src/me/topchetoeu/jscript/engine/values/NativeFunction.java
@@ -4,7 +4,7 @@ import me.topchetoeu.jscript.engine.CallContext;
 
 public class NativeFunction extends FunctionValue {
     public static interface NativeFunctionRunner {
-        Object run(CallContext ctx, Object thisArg, Object[] values) throws InterruptedException;
+        Object run(CallContext ctx, Object thisArg, Object[] args) throws InterruptedException;
     }
 
     public final NativeFunctionRunner action;
@@ -18,4 +18,8 @@ public class NativeFunction extends FunctionValue {
         super(name, 0);
         this.action = action;
     }
+    public NativeFunction(NativeFunctionRunner action) {
+        super("", 0);
+        this.action = action;
+    }
 }
diff --git a/src/me/topchetoeu/jscript/engine/values/Values.java b/src/me/topchetoeu/jscript/engine/values/Values.java
index e5e8399..a5b6851 100644
--- a/src/me/topchetoeu/jscript/engine/values/Values.java
+++ b/src/me/topchetoeu/jscript/engine/values/Values.java
@@ -391,19 +391,21 @@ public class Values {
         }
 
         if (obj instanceof ArrayValue) {
-            var raw = array(obj).toArray();
-
+            
             if (clazz.isAssignableFrom(ArrayList.class)) {
+                var raw = array(obj).toArray();
                 var res = new ArrayList<>();
                 for (var i = 0; i < raw.length; i++) res.add(convert(ctx, raw[i], Object.class));
                 return (T)new ArrayList<>(res);
             }
             if (clazz.isAssignableFrom(HashSet.class)) {
+                var raw = array(obj).toArray();
                 var res = new HashSet<>();
                 for (var i = 0; i < raw.length; i++) res.add(convert(ctx, raw[i], Object.class));
                 return (T)new HashSet<>(res);
             }
             if (clazz.isArray()) {
+                var raw = array(obj).toArray();
                 Object res = Array.newInstance(clazz.arrayType(), raw.length);
                 for (var i = 0; i < raw.length; i++) Array.set(res, i, convert(ctx, raw[i], Object.class));
                 return (T)res;
diff --git a/src/me/topchetoeu/jscript/js/bootstrap.js b/src/me/topchetoeu/jscript/js/bootstrap.js
index 204a85a..2cf9d29 100644
--- a/src/me/topchetoeu/jscript/js/bootstrap.js
+++ b/src/me/topchetoeu/jscript/js/bootstrap.js
@@ -1,7 +1,8 @@
 // TODO: load this in java
 var ts = require('./ts__');
+log("Loaded typescript!");
 
-var src = '', lib = libs.join(''), decls = [], version = 0;
+var src = '', lib = libs.join(''), decls = '', version = 0;
 var libSnapshot = ts.ScriptSnapshot.fromString(lib);
 
 var settings = {
@@ -9,7 +10,7 @@ var settings = {
     declarationDir: "/out",
     target: ts.ScriptTarget.ES5,
     lib: [ ],
-    module: ts.ModuleKind.CommonJS,
+    module: ts.ModuleKind.None,
     declaration: true,
     stripInternal: true,
     downlevelIteration: true,
@@ -20,41 +21,17 @@ var settings = {
 
 var reg = ts.createDocumentRegistry();
 var service = ts.createLanguageService({
-    getCanonicalFileName: function (fileName) { return fileName; },
-    useCaseSensitiveFileNames: function () { return true; },
-    getNewLine: function () { return "\n"; },
-    getEnvironmentVariable: function () { return ""; },
-
-    log: function() {
-        log.apply(undefined, arguments);
-    },
-    fileExists: function (fileName) {
-        return (
-            fileName === "/src.ts" ||
-            fileName === "/lib.d.ts" ||
-            fileName === "/glob.d.ts"
-        );
-    },
-    readFile: function (fileName) {
-        if (fileName === "/src.ts") return src;
-        if (fileName === "/lib.d.ts") return lib;
-        if (fileName === "/glob.d.ts") return decls.join('\n');
-        throw new Error("File '" + fileName + "' doesn't exist.");
-    },
-    writeFile: function (fileName, data) {
-        if (fileName.endsWith(".js")) res = data;
-        else if (fileName.endsWith(".d.ts")) decls.push(data);
-        else throw new Error("File '" + fileName + "' isn't writable.");
-    },
-    getCompilationSettings: function () {
-        return settings;
-    },
     getCurrentDirectory: function() { return "/"; },
     getDefaultLibFileName: function() { return "/lib_.d.ts"; },
     getScriptFileNames: function() { return [ "/src.ts", "/lib.d.ts", "/glob.d.ts" ]; },
+    getCompilationSettings: function () { return settings; },
+    fileExists: function(filename) { return filename === "/lib.d.ts" || filename === "/src.ts" || filename === "/glob.d.ts"; },
+
     getScriptSnapshot: function(filename) {
         if (filename === "/lib.d.ts") return libSnapshot;
-        else return ts.ScriptSnapshot.fromString(this.readFile(filename));
+        if (filename === "/src.ts") return ts.ScriptSnapshot.fromString(src);
+        if (filename === "/glob.d.ts") return ts.ScriptSnapshot.fromString(decls);
+        throw new Error("File '" + filename + "' doesn't exist.");
     },
     getScriptVersion: function (filename) {
         if (filename === "/lib.d.ts") return 0;
@@ -65,16 +42,11 @@ var service = ts.createLanguageService({
 service.getEmitOutput('/lib.d.ts');
 log('Loaded libraries!');
 
-
-function compile(code) {
-    src = code;
-    version++;
+function compile(filename, code) {
+    src = code, version++;
 
     var emit = service.getEmitOutput("/src.ts");
 
-    var res = emit.outputFiles[0].text;
-    var decl = emit.outputFiles[1].text;
-
     var diagnostics = []
         .concat(service.getCompilerOptionsDiagnostics())
         .concat(service.getSyntacticDiagnostics("/src.ts"))
@@ -83,7 +55,9 @@ function compile(code) {
             var message = ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n");
             if (diagnostic.file) {
                 var pos = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
-                return diagnostic.file.fileName.substring(1) + ":" + (pos.line + 1) + ":" + (pos.character + 1) + ": " + message;
+                var file = diagnostic.file.fileName.substring(1);
+                if (file === "src.ts") file = filename;
+                return file + ":" + (pos.line + 1) + ":" + (pos.character + 1) + ": " + message;
             }
             else return "Error: " + message;
         });
@@ -92,17 +66,21 @@ function compile(code) {
         throw new SyntaxError(diagnostics.join('\n'));
     }
 
-    decls.push(decl);
-
     return {
-        result: res,
-        diagnostics: diagnostics
+        result: emit.outputFiles[0].text,
+        declaration: emit.outputFiles[1].text
     };
 }
 
-log("Loaded typescript!");
-init(function (code) {
-    var res = compile(code);
-    return res.result;
-});
+init(function (filename, code) {
+    var res = compile(filename, code);
 
+    return [
+        res.result,
+        function(func, th, args) {
+            var val = func.apply(th, args);
+            decls += res.declaration;
+            return val;
+        }
+    ];
+});
diff --git a/src/me/topchetoeu/jscript/parsing/Parsing.java b/src/me/topchetoeu/jscript/parsing/Parsing.java
index dd576b8..c817931 100644
--- a/src/me/topchetoeu/jscript/parsing/Parsing.java
+++ b/src/me/topchetoeu/jscript/parsing/Parsing.java
@@ -68,7 +68,7 @@ public class Parsing {
         reserved.add("yield");
         // Although the standards allow it, these are keywords in newer ES, so we won't allow them
         reserved.add("const");
-        reserved.add("await");
+        // reserved.add("await");
         reserved.add("async");
         // These are allowed too, however our parser considers them keywords
         reserved.add("undefined");
diff --git a/src/me/topchetoeu/jscript/polyfills/AsyncFunction.java b/src/me/topchetoeu/jscript/polyfills/AsyncFunction.java
new file mode 100644
index 0000000..32c4ab3
--- /dev/null
+++ b/src/me/topchetoeu/jscript/polyfills/AsyncFunction.java
@@ -0,0 +1,87 @@
+package me.topchetoeu.jscript.polyfills;
+
+import me.topchetoeu.jscript.engine.CallContext;
+import me.topchetoeu.jscript.engine.frame.CodeFrame;
+import me.topchetoeu.jscript.engine.frame.Runners;
+import me.topchetoeu.jscript.engine.values.ArrayValue;
+import me.topchetoeu.jscript.engine.values.CodeFunction;
+import me.topchetoeu.jscript.engine.values.FunctionValue;
+import me.topchetoeu.jscript.engine.values.NativeFunction;
+import me.topchetoeu.jscript.engine.values.Values;
+import me.topchetoeu.jscript.exceptions.EngineException;
+
+public class AsyncFunction extends FunctionValue {
+    public final CodeFunction body;
+
+    private class CallHandler {
+        private boolean awaiting = false;
+        private Object awaited = null;
+        public final Promise promise = new Promise();
+        public CodeFrame frame;
+        private final NativeFunction fulfillFunc = new NativeFunction("", this::fulfill);
+        private final NativeFunction rejectFunc = new NativeFunction("", this::reject);
+
+        private Object reject(CallContext ctx, Object thisArg, Object[] args) throws InterruptedException {
+            if (args.length > 0) promise.reject(ctx, args[0]);
+            return null;
+        }
+        public Object fulfill(CallContext ctx, Object thisArg, Object[] args) throws InterruptedException {
+            if (args.length == 1) frame.push(args[0]);
+
+            while (true) {
+                awaiting = false;
+                awaited = null;
+
+                try {
+                    var res = frame.next(ctx);
+                    if (res != Runners.NO_RETURN) {
+                        promise.fulfill(ctx, res);
+                        return null;
+                    }
+                }
+                catch (EngineException e) {
+                    promise.reject(e);
+                    return null;
+                }
+
+                if (!awaiting) continue;
+
+                frame.pop();
+
+                if (awaited instanceof Promise) ((Promise)awaited).then(ctx, fulfillFunc, rejectFunc);
+                else if (Values.isPrimitive(awaited)) frame.push(awaited);
+                try {
+                    var res = Values.getMember(ctx, awaited, "then");
+                    if (res instanceof FunctionValue) {
+                        Values.function(res).call(ctx, awaited, fulfillFunc, rejectFunc);
+                        return null;
+                    }
+                    else frame.push(awaited);
+                }
+                catch (EngineException e) {
+                    promise.reject(e);
+                    return null;
+                }
+            }
+        }
+
+        public Object await(CallContext ctx, Object thisArg, Object[] args) {
+            this.awaiting = true;
+            this.awaited = args[0];
+            return null;
+        }
+    }
+
+    @Override
+    public Object call(CallContext _ctx, Object thisArg, Object... args) throws InterruptedException {
+        var handler = new CallHandler();
+        handler.frame = new CodeFrame(thisArg, new Object[] { new NativeFunction("await", handler::await), new ArrayValue(args) }, body);
+        handler.fulfill(_ctx, null, new Object[0]);
+        return handler.promise;
+    }
+
+    public AsyncFunction(CodeFunction body) {
+        super(body.name, body.length);
+        this.body = body;
+    }
+}
diff --git a/src/me/topchetoeu/jscript/polyfills/Internals.java b/src/me/topchetoeu/jscript/polyfills/Internals.java
index 110f9c0..9aa7446 100644
--- a/src/me/topchetoeu/jscript/polyfills/Internals.java
+++ b/src/me/topchetoeu/jscript/polyfills/Internals.java
@@ -4,6 +4,7 @@ import java.util.HashMap;
 
 import me.topchetoeu.jscript.engine.CallContext;
 import me.topchetoeu.jscript.engine.values.ArrayValue;
+import me.topchetoeu.jscript.engine.values.CodeFunction;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.engine.values.ObjectValue;
 import me.topchetoeu.jscript.engine.values.Symbol;
@@ -235,6 +236,12 @@ public class Internals {
         return res.exports();
     }
 
+    @Native
+    public AsyncFunction makeAsync(FunctionValue func) {
+        if (func instanceof CodeFunction) return new AsyncFunction((CodeFunction)func);
+        else throw EngineException.ofType("Can't create an async function with a non-js function.");
+    }
+
     @NativeGetter("err")
     public ObjectValue errProto(CallContext ctx) {
         return ctx.engine.errorProto();
diff --git a/src/me/topchetoeu/jscript/polyfills/Promise.java b/src/me/topchetoeu/jscript/polyfills/Promise.java
index b973184..2795de1 100644
--- a/src/me/topchetoeu/jscript/polyfills/Promise.java
+++ b/src/me/topchetoeu/jscript/polyfills/Promise.java
@@ -203,11 +203,11 @@ public class Promise {
     public void fulfill(CallContext ctx, Object val) {
         if (Values.isWrapper(val, Promise.class)) Values.wrapper(val, Promise.class).then(ctx,
             new NativeFunction(null, (e, th, args) -> {
-                this.fulfill(args[0]);
+                this.fulfill(e, args[0]);
                 return null;
             }),
             new NativeFunction(null, (e, th, args) -> {
-                this.reject(args[0]);
+                this.reject(e, args[0]);
                 return null;
             })
         );
@@ -231,11 +231,11 @@ public class Promise {
     public void reject(CallContext ctx, Object val) {
         if (Values.isWrapper(val, Promise.class)) Values.wrapper(val, Promise.class).then(ctx,
             new NativeFunction(null, (e, th, args) -> {
-                this.reject(args[0]);
+                this.reject(e, args[0]);
                 return null;
             }),
             new NativeFunction(null, (e, th, args) -> {
-                this.reject(args[0]);
+                this.reject(e, args[0]);
                 return null;
             })
         );
diff --git a/src/me/topchetoeu/jscript/polyfills/TypescriptEngine.java b/src/me/topchetoeu/jscript/polyfills/TypescriptEngine.java
index 31ec4c5..54b677e 100644
--- a/src/me/topchetoeu/jscript/polyfills/TypescriptEngine.java
+++ b/src/me/topchetoeu/jscript/polyfills/TypescriptEngine.java
@@ -6,16 +6,26 @@ import java.util.Map;
 
 import me.topchetoeu.jscript.engine.scope.GlobalScope;
 import me.topchetoeu.jscript.engine.values.ArrayValue;
-import me.topchetoeu.jscript.engine.values.CodeFunction;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.engine.values.NativeFunction;
+import me.topchetoeu.jscript.engine.values.Values;
 
 public class TypescriptEngine extends PolyfillEngine {
     private FunctionValue ts;
 
     @Override
-    public CodeFunction compile(GlobalScope scope, String filename, String raw) throws InterruptedException {
-        if (ts != null) raw = (String)ts.call(context(), null, raw);
+    public FunctionValue compile(GlobalScope scope, String filename, String raw) throws InterruptedException {
+        if (ts != null) {
+            var res = Values.array(ts.call(context(), null, filename, raw));
+            var src = Values.toString(context(), res.get(0));
+            var func = Values.function(res.get(1));
+
+            var compiled = super.compile(scope, filename, src);
+
+            return new NativeFunction(null, (ctx, thisArg, args) -> {
+                return func.call(context(), null, compiled, thisArg, new ArrayValue(args));
+            });
+        }
         return super.compile(scope, filename, raw);
     }
 
@@ -42,7 +52,7 @@ public class TypescriptEngine extends PolyfillEngine {
 
         scope.define("libs", true, ArrayValue.of(decls));
         scope.define(true, new NativeFunction("init", (el, t, args) -> {
-            ts = (FunctionValue)args[0];
+            ts = Values.function(args[0]);
             return null;
         }));