All guards are exported from the package root and narrow their argument’s type; the assert* variants are throwing assertion forms of the corresponding is* guards.
| Guard |
True for |
isTransport(v) |
anything usable as the transport option |
isEmitTransport(v) / isReceiveTransport(v) |
transports that can send / receive (note ServiceWorker is emit-only, ServiceWorkerContainer receive-only) |
assertEmitTransport(v) / assertReceiveTransport(v) |
throwing assertion forms |
| Guard |
True for |
isCustomTransport(v) / isCustomEmitTransport(v) / isCustomReceiveTransport(v) |
plain-object { emit?, receive? } wrappers (see custom transports) |
| Guard |
True for |
isJsonOnlyTransport(v) / isEmitJsonOnlyTransport(v) / isReceiveJsonOnlyTransport(v) |
JSON-mode transports (WebSocket, WebExtension family, { isJson: true }) |
| Guard |
True for |
isWindow / isWorker / isDedicatedWorker / isSharedWorker / isServiceWorker / isServiceWorkerContainer / isWebSocket |
the respective platform objects (cross-origin-window safe) |
isWebExtensionRuntime / isWebExtensionPort / isWebExtensionOnConnect / isWebExtensionOnMessage |
WebExtension transports |
| Guard |
True for |
isOsraMessage(v) |
objects carrying the __OSRA_KEY__ envelope field (see the wire protocol) |
isTransferable(v) / isTypedArray(v) / isSharedArrayBuffer(v) |
value classification helpers |