[hermiondev]

Problem

Two production fetch sites in the shipped, actively-released @account-kit/signer (v4.x.x line, latest publish 4.88.5 on 2026-08-11) have no timeout and no AbortSignal:

1. account-kit/signer/src/client/base.ts — BaseSignerClient.request(): every signer API POST (signup, sign-payload, session/MFA routes) to api.g.alchemy.com hangs forever if the endpoint accepts the connection but stalls.
2. account-kit/signer/src/utils/solana.ts — createSolanaSponsoredTransaction(): the alchemy_requestFeePayer RPC hangs transaction construction forever on a stalled RPC.

This is the same defect class already reported/fixed for the v5 REST client in #2571; the v4 signer surface was missed.

Reproduction

Node 20/24 against a stall server (accept socket, never reply), replicating the exact call shape from the published dist/esm/client/base.js:845:

• Unfixed shape: promise never settles past an 8s watchdog (hang).
• Patched shape: TimeoutError at ~3001ms (3s demo value; PR uses 30s).

Fix

Attach AbortSignal.timeout(30_000) at both sites, feature-detected so runtimes without AbortSignal.timeout (older browsers / React Native) keep previous behavior rather than crashing.

Validation

• tsc package build (build:esm + build:types): 0 errors on the patched tree (node@20/24, yarn 1.22.22, frozen lockfile).
• prettier --check clean after formatting.
• vitest suite in this workspace fails identically before and after the change (util.isString in shared .vitest/setupTests.ts — pre-existing environment breakage, unrelated to this diff; verified via git stash A/B).

Static scan note: my fetch-boundary scanner still flags the solana.ts site as REVIEW because the signal is threaded through the local options object (config-indirect) rather than inline — the runtime probe above is the ground truth.

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PR-Codex overview

This PR introduces timeout handling for fetch requests in the solana.ts and base.ts files, ensuring that stalled requests do not hang indefinitely. It implements a default timeout of 30 seconds for API requests, improving error handling for unresponsive endpoints.

Detailed summary

• Added timeout handling for fetch requests in solana.ts to prevent indefinite hanging.
• Introduced a constant SIGNER_REQUEST_TIMEOUT_MS in base.ts for default timeout duration (30 seconds).
• Enhanced error handling for stalled requests in both solana.ts and base.ts using AbortSignal.timeout.

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