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fix: guard SharedWorker reference on runtimes without the global - #11
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`SharedWorker` is not defined on mobile Safari, in-app WebViews, and hardened browser modes. The bare `guest instanceof SharedWorker` checks in `host.connect()` throw `ReferenceError` on those runtimes before we even reach the iframe-target codepath, which is what most consumers actually need. Adds an `isSharedWorker(guest)` helper that gates the `instanceof` check with `typeof SharedWorker !== "undefined"`, mirroring the existing `isWorkerLike` pattern for `Worker`. Use it at both `host.ts` call sites.
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Summary
SharedWorkeris not defined on mobile Safari, in-app WebViews, and hardened browser modes. The bareguest instanceof SharedWorkerchecks inhost.connect()(lines 53 and 61 ofsrc/host.ts) throwReferenceErroron those runtimes — before we even reach the iframe-target codepath, which is what most consumers actually need.Adds an
isSharedWorker(guest)helper that gates theinstanceofcheck withtypeof SharedWorker !== "undefined", mirroring the existingisWorkerLikepattern forWorker. Uses it at bothhost.tscall sites.Test plan
npm run build— cleannpm test— all green, including 2 new regression tests:isSharedWorkerreturns false without throwing whenSharedWorkeris undefined; detects instances when the global is present