[BUGFIX release] Ensure "use strict";
is properly added for modules.
#11917
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Esperanto would automatically add
"use strict";
to the beginning of every file. When we swapped to using Babel for module transpilation, we forgot to update the Babel whitelist to add"use strict";
back.This has been an issue since v1.13.0.
Thanks to @stefanpenner for reporting.