Add sandboxed context parameter preventEscape

Default: false. This will fix: metarhia/Example#58 PR-URL: #41
metarhia · Nov 30, 2020 · a51c2b8 · a51c2b8
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,6 +12,7 @@ First metavm implementation with following features
 - Loader script from file with timeout and error handling
 - Add `use strict` if it's not found, fix line offset
 - Contexts, use default empty and frozen, emulated or pass one
+- Use `microtaskMode` https://github.com/nodejs/node/pull/34023
 
 [unreleased]: https://github.com/metarhia/metavm/compare/v0.1.0...HEAD
 [0.1.0]: https://github.com/metarhia/metavm/releases/tag/v0.1.0
diff --git a/lib/vm.js b/lib/vm.js
@@ -26,9 +26,9 @@ const COMMON_CONTEXT = vm.createContext(
   })
 );
 
-const createContext = (context) => {
+const createContext = (context, preventEscape = false) => {
   if (!context) return EMPTY_CONTEXT;
-  return vm.createContext(context, CONTEXT_OPTIONS);
+  return vm.createContext(context, preventEscape ? CONTEXT_OPTIONS : {});
 };
 
 class MetaScript {