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Promise is implemented as a pair of objects. `napi_create_promise()` returns both a JavaScript promise and a newly allocated "deferred" in its out-params. The deferred is linked to the promise such that the deferred can be passed to `napi_resolve_deferred()` or `napi_reject_deferred()` to reject/resolve the promise. `napi_is_promise()` can be used to check if a `napi_value` is a native promise - that is, a promise created by the underlying engine, rather than a pure JS implementation of a promise. PR-URL: https://github.com/nodejs/node/pull/14365 Fixes: https://github.com/nodejs/abi-stable-node/issues/242 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Timothy Gu <timothygu99@gmail.com>