Synapse SAP SDK v0.4.1: Fixing ESM Issues in Next.js & Vite
Synapse SAP SDK v0.4.1 resolves ESM compatibility issues and introduces a lightweight wallet interface designed for modern JavaScript environments.
We have released Synapse SAP SDK v0.4.1 , a patch update focused on improving compatibility with modern JavaScript environments.
This release resolves an issue affecting developers using ESM-first bundlers such as Next.js, Vite, and Webpack.
The fix removes a dependency on Anchor’s Wallet class and replaces it with a lightweight wallet interface designed to work consistently across both CommonJS and ESM environments.
The Issue
Developers integrating the SAP SDK in environments like Next.js or Vite encountered runtime import errors when bundling the SDK.
The root cause was a dependency on the Wallet class from:
@coral-xyz/anchor
While Anchor exposes this class in its CommonJS build, it is not exported in the ESM entry point.
Modern bundlers resolve the ESM version first, which meant the Wallet import simply did not exist during compilation.
This resulted in errors during build or runtime in environments such as:
- Next.js
- Vite
- Webpack-based frameworks
- other ESM-first toolchains
In practice, this prevented developers from using the SAP SDK in many modern frontend and full-stack JavaScript environments.
The Solution
To resolve this incompatibility, we removed the dependency on Anchor’s Wallet class entirely and introduced a new minimal wallet interface designed specifically for SAP.
This change ensures consistent behavior across CJS and ESM environments without relying on Anchor internals.
New SapWallet Interface
The SDK now introduces SapWallet, a minimal wallet/signer interface used by the SAP client.
This interface defines only the capabilities required by the SDK:
- signing transactions
- exposing the wallet public key
Because it is not tied to Anchor, it works across different runtime environments and wallet implementations.
This also makes the SDK easier to integrate with existing wallet adapters and custom signing solutions.
KeypairWallet: Drop-in Replacement
Alongside the new interface, we introduced KeypairWallet, a lightweight wallet implementation.
This class acts as a drop-in replacement for Anchor’s NodeWallet.
It supports signing for both transaction formats used in Solana:
- legacy Transaction
- VersionedTransaction
This ensures compatibility with both existing Solana workflows and newer transaction models.
Updated Client Initialization
The createClient() function has been updated to use the new wallet interface.
Instead of passing Anchor’s Wallet, developers now provide an implementation of SapWallet.
This allows applications to use:
- Keypair-based wallets
- browser wallet adapters
- custom signing providers
The result is a more flexible SDK that integrates cleanly with different wallet ecosystems.
New Exports
To make integration straightforward, the SDK now exports both wallet utilities directly from its main entry point.
The following are now available:
• SapWallet (interface) • KeypairWallet (class implementation)
This allows developers to quickly bootstrap SAP clients without relying on Anchor wallet utilities.
Why This Matters
Modern JavaScript development environments increasingly rely on ESM-first toolchains.
Frameworks such as Next.js, Vite, and other modern bundlers expect dependencies to support native ESM resolution.
By removing the Anchor wallet dependency and introducing a minimal wallet abstraction, the SAP SDK now:
- works reliably in both Node and browser environments
- avoids CommonJS / ESM compatibility issues
- integrates more easily with wallet adapter ecosystems
- reduces reliance on Anchor internals
This change improves the developer experience while making the SAP SDK more portable across different application architectures.
Upgrade Notes
Developers upgrading to v0.4.1 should update their wallet usage when creating SAP clients.
Instead of using Anchor’s Wallet, applications should provide an implementation of SapWallet, such as KeypairWallet.
Looking Ahead
This patch release is part of an ongoing effort to keep the Synapse Agent Protocol developer stack modular and environment-agnostic.
As more builders integrate SAP into agents, services, and on-chain coordination systems, ensuring compatibility with modern frameworks becomes essential.
The v0.4.1 release ensures the SAP SDK works seamlessly across today’s JavaScript ecosystem.