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test/parallel/test-vm-strict-mode.js

@@ -0,0 +1,14 @@
+'use strict';
+// https://github.com/nodejs/node/issues/12300
+
+require('../common');
+const assert = require('assert');
+const vm = require('vm');
+
+const ctx = vm.createContext({ x: 42 });
+
+// This might look as if x has not been declared, but x is defined on the
+// sandbox and the assignment should not throw.
+vm.runInContext('"use strict"; x = 1', ctx);
+
+assert.strictEqual(ctx.x, 1);