Summary:
Changelog: [Internal]
Historically, Immediate API is implemented upon the React Native's
internal microtask-y queue (known as "immediate queue"), which
is the same queue Promise polyfill is operating on.
To make React Native suitable of using the built-in Promises from JSVMs,
which usually enqueues to the JSVM internal microtask queue and has no
access to React Native microtask-y queue, we need to migrate the
Immediate API to use the JSVM microtask queue as well to preserve the
semantics of code relies on the interleaving of promises and immediates.
To do that, this diff implement a shim layer for immediate APIs via the
new `global.queueMicrotask` API (which enqueues to JSVM) in JS, by wrapping
the immediate callback into a "microtask callback", which validate the
`immediate ID` against `clearedImmediate` Set before invoking it.
Reviewed By: RSNara
Differential Revision: D29845305
fbshipit-source-id: c2ed3fed426a5316b1e0dfbfaad51706d1765d4d
Xuan HuangandFacebook GitHub Bot
dc8d218077