k6

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The moduletest runtime should set "use strict"; so to have the same behaviour as for the real runtime, otherwise in some cases some bugs could be introduced like in this test https://github.com/grafana/k6/blob/b89a3aaa6bff07907140e6b31880971aeef3570b/js/modules/k6/execution/execution_test.go#L160-L165 where the Runtime doesn't throw an exception in the case DynamicObject.Set returns false.

The suggestion is to wrap the goja.RunString prefixing all the scripts with "use strict";. This has a big dependency on the ESM project, so let's wait for it before.