feat: add fetchOptions to core and react so Origin header can be sent on RN

[andrascodes]

This PR is part of a stack created with Aviator. feat(expo-example): add export wallet on mobile #168 feat(expo-example): configure and add magic link login #142 fix(expo-example): add EAS local build config and fix HMR bug with secureStoreStamper #141 feat(expo-example): migrate to expo-router #131 feat(react): enable OAuth in React Native #80 feat(expo-example): add Passkey auth and test on Android #124 feat: add expo-example app #76 fix(react): race condition between initialize and isAuthorized in RN #75 ➡️ feat: add fetchOptions to core and react so Origin header can be sent on RN #74 main

Part of FS-1971

fetch doesn't automatically send Origin headers on React Native as there's no concept of a domain there. (It sends an IP instead.) So I solved this by passing through the Origin headers instead configurable via the wallet-react and wallet-core entrypoints.
We definitely have to come up with a better solution to this, but for the purpose of testing this works. I'm totally fine not merging this.

[andrascodes]

I'll actually change this so we pass in an appId only. Then inside the SDK I'll just create the Origin header from the appId. I think that will match better what the KMS is planning to accept.

[SahilVasava]

Direction is right — fetchOptions is the right plumbing for RN's Origin-header use case, and the Omit<RequestInit, 'body' | 'method' | 'signal'> is the correct restriction (SDK builds body, sets method, controls signal).

Two cleanup suggestions inline:

• Reuse CreateTransportOptions['fetchOptions'] instead of duplicating the Omit
• Hoist { fetchOptions: params.fetchOptions } once instead of repeating it four times

(Out of scope: the user's fetchOptions.headers can override SDK's Content-Type due to merge order in rest.ts:52-56. Pre-existing, worth a follow-up but doesn't block this.)

[SahilVasava]

LGTM — type duplication removed (uses CreateTransportOptions['fetchOptions']) and the repeated { fetchOptions: params.fetchOptions } is now a single httpOpts local.

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Project	Deployment	Actions	Updated (UTC)
zerodev-signer-demo	Ready	Preview, Comment	May 13, 2026 10:46am

The base branch was changed.