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This is the initial work to bootstrap Web interfaces that are defined with extended attributes `[Exposed=*]`. The ShadowRealm instances are garbage-collected once it is unreachable. However, V8 can not infer the reference cycles between the per-realm strong persistent function handles and the realm's context handle. To allow the context to be gc-ed once it is not reachable, the per-realm persistent handles are attached to the context's global object and the persistent handles are set as weak. PR-URL: https://github.com/nodejs/node/pull/46809 Refs: https://github.com/nodejs/node/issues/42528 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>