Host.historyBack
luastra/hostHost.historyBack(): RequestId
Requests one step back in the host browser history and returns a RequestId. The resulting location or system-Back event remains part of the normal navigation event flow.
Before you use it
Add luastra/host to this module's dependencies in luastra.json, then import it with require("luastra/host"). Declare navigation.history in luastra.json. Save the returned RequestId with its purpose and implement app.resolve.
How it fits
The function starts an asynchronous host request and returns immediately. app.resolve receives its success payload or stable failure code; availability and permission can vary by host.
When to use it
Use Host.historyBack after Navigation.decideBack delegates to browser history or when a UI Back control intentionally mirrors browser Back. Do not also pop application state independently unless the history event contract requires it.
Parameters
No parameters.
Returns
RequestId — an opaque request identifier used to correlate the asynchronous completion in app.resolve.
What happens next
A RequestId now, followed later by one matching app.resolve completion.
Failures and fixes
Undeclared capability, unavailable host support, denied permission, invalid input, deadline, network, or internal failure reaches the bounded failure path. Public completion codes are CANCELLED, DEADLINE, FORBIDDEN, INTERNAL, NETWORK, UNAUTHORIZED, and VALIDATION.
Availability
Public-source alpha capability API in 0.5.0-alpha; verify each claimed host independently.
Focused example
local Host = require("luastra/host")
Host.historyBack()