[HermesV1] Sync JSI from Aug 29th to Jan 14th #1878
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Summary: X-link: facebook/react-native#54547 We want to have a proper way of releasing new JSI features, rather than releasing into JSI as they are added. To do this, we are adding a new `JSI_UNSTABLE` flag that will gate new features. Until Hermes releases a new version, all of these "unstable" features are subject to change. Interfaces may be modified, API behavior may be changed, etc. When Hermes release a new version, the new additions will be moved out of the "unstable" status and become frozen. This diff adds the `JSI_UNSTABLE` flag to JSI and adds corresponding changes to the BUCK build. Later diffs will use this gate new APIs. Changelog: [Internal] Reviewed By: lavenzg Differential Revision: D85915163 fbshipit-source-id: b2f754af4bb53db8dfe837e3ea2e2543d691754d
Summary: `jsi.h` uses types like `uint32_t` but never includes `<cstdint>`. Changelog: [Internal] Reviewed By: avp Differential Revision: D87953504 fbshipit-source-id: 7d10e458ff14b01da293f2714d6a562958f9e8ff
Summary: X-link: facebook/react-native#52624 Add a new optional interface `ISerialization` to JSI. This interface contains four APIs to clone objects from one runtime to another runtime. Four methods are introduced in this interface: * `serialize`: Takes in a JS value (represented by `jsi::Value`) and serialize the value into an opaque `Serialized` object. * `deserialize`: Takes in the `Serialized` object created by `serialize` and deserialize it into the runtime, returning the created JS value. * `serializeWithTransfer`: Takes in a JS value (represented by `jsi::Value`) and a `transferList` (a `jsi::Array` of `jsi::Value`s). This will serialize the `value` into an opaque `Serialize` object and transfer the ownership of everything in `transferList` into the `Serialized` object. If any non-transferable values is passed into the transferList, this will throw. This `Serialized` object must only be deserialized once. * `deserializeWithTransfer`: Takes in the `Serialized` object created by `serializeWithTransfer`. It will deserialize the object into the runtime and any value owned by the `Serialized` object will now be owned by the current runtime. It will return an `jsi::Array` where the first value is the deserialized value passed into `serializeWithTransfer`, followed by all transferred values. The lifetime of the `Serialized` object created from the APIs is independent of the original object and runtime. Note that objects can only be copied into another runtime instance of the same type. For example, a serialized object produced by the Hermes runtime can only be deserialized by another Hermes runtime. Changelog: [Internal] Reviewed By: dannysu, fbmal7 Differential Revision: D76547681 fbshipit-source-id: 0c774f3f469c26d3894cac179f4ce5e32cf5ad7f
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cortinico
approved these changes
Jan 14, 2026
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Summary
This PR syncs JSI with the latest commits that landed on static_h:
Test Plan
GHA