Smaller imrovements

lib/setup-sandbox.js

@@ -308,7 +308,8 @@ const withProxy = localObjectFreeze({
 const interanState = localObjectFreeze({
 	__proto__: null,
 	wrapWith(x) {
-		return new LocalProxy(x, withProxy);
+		if (x === null || x === undefined) return x;
+		return new LocalProxy(localObject(x), withProxy);
 	},
 	handleException: ensureThis,
 	import(what) {

lib/transformer.js

@@ -16,7 +16,7 @@ function makeNiceSyntaxError(message, code, filename, location, tokenizer) {
 	while (end < code.length && !acornIsNewLine(code.charCodeAt(end))) {
 		end++;
 	}
-	let markerEnd = tokenizer.end;
+	let markerEnd = tokenizer.start === location ? tokenizer.end : location + 1;
 	if (!markerEnd || markerEnd > end) markerEnd = end;
 	let markerLen = markerEnd - location;
 	if (markerLen <= 0) markerLen = 1;
@@ -101,7 +101,11 @@ function transformer(args, body, isAsync, isGenerator, filename) {
 	let internStateValiable = undefined;
 
 	acornWalkFull(ast, (node, state, type) => {
-		if (type === 'CatchClause') {
+		if (type === 'Function') {
+			if (node.async) hasAsync = true;
+		}
+		const nodeType = node.type;
+		if (nodeType === 'CatchClause') {
 			const param = node.param;
 			if (param) {
 				const name = assertType(param, 'Identifier').name;
@@ -115,7 +119,7 @@ function transformer(args, body, isAsync, isGenerator, filename) {
 					});
 				}
 			}
-		} else if (type === 'WithStatement') {
+		} else if (nodeType === 'WithStatement') {
 			insertions.push({
 				__proto__: null,
 				pos: node.object.start,
@@ -128,27 +132,26 @@ function transformer(args, body, isAsync, isGenerator, filename) {
 				order: TO_RIGHT,
 				code: ')'
 			});
-		} else if (type === 'Identifier') {
+		} else if (nodeType === 'Identifier') {
 			if (node.name === INTERNAL_STATE_NAME) {
 				if (internStateValiable === undefined || internStateValiable.start > node.start) {
 					internStateValiable = node;
 				}
 			}
-		} else if (type === 'ImportExpression') {
+		} else if (nodeType === 'ImportExpression') {
 			insertions.push({
 				__proto__: null,
 				pos: node.start,
 				order: TO_RIGHT,
 				code: INTERNAL_STATE_NAME + '.'
 			});
-		} else if (type === 'Function') {
-			if (node.async) hasAsync = true;
 		}
 	});
 
 	if (internStateValiable) {
 		throw makeNiceSyntaxError('Use of internal vm2 state variable', code, filename, internStateValiable.start, {
 			__proto__: null,
+			start: internStateValiable.start,
 			end: internStateValiable.end
 		});
 	}