[dylanjeffers]

Summary

Metro resolves viem's CommonJS build (viem/_cjs/chains/index.js) and doesn't tree-shake, so import { mainnet } from 'viem/chains' in createSdkWithServices.ts pulled all 383 chain definitions into the mobile bundle, plus the zksync / celo / op-stack / linea formatters those chains reference.

viem 2.21.21's exports map has no per-chain subpath (only ./chains and ./chains/utils), so this defines mainnet in the sdk (packages/sdk/src/sdk/utils/mainnet.ts) with defineChain, copying viem's fields. A new test asserts it toEquals viem's mainnet, so the copy can't drift silently on a viem upgrade.

That was the only viem/chains import reachable from mobile (sdk, common, mobile, spl, eth). The other imports are in web, identity-service and an sdk script, and none of them ship to mobile.

Bundle size (iOS, react-native bundle --dev false --minify true)

	before (main 999e753)	after	Δ
main.jsbundle (min)	13,272,559 B	13,003,080 B	−269,479 B (−263 KiB)
gzip	3,152,937 B	3,111,375 B	−41,562 B
viem/_cjs/chains/**	231,540 B (383 files)	0	−231,540 B
viem/_cjs/{zksync,celo,op-stack,linea}	19,417 B	0	−19,417 B
sdk/utils/mainnet.ts	—	545 B	+545 B

The rest of the difference is unmapped bytes and module wrappers (measured with source-map-explorer --json).

Web: Vite already tree-shakes viem's ESM build, and web/src/services/audius-sdk/audiusSdk.ts still imports viem's mainnet for its relay wallet client. The sdk's inline copy therefore adds about 0.5 KB minified to web (esbuild estimate; I didn't run a full web build).

Behavior

The chain passed to the default ethPublicClient / ethWalletClient is deep-equal to viem's mainnet: same id, RPC defaults, ENS and multicall3 contracts. The eth RPC endpoint still comes from servicesConfig.ethereum.rpcEndpoint.

Test plan

• packages/sdk: vitest run: 31 files, 249 passed / 2 skipped. Includes the new mainnet.test.ts and createSdkWithServices.lazy.test.ts.
• packages/sdk: eslint and tsc --noEmit pass
• iOS release bundle builds; before/after numbers above

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: b1c24f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@audius/sdk	Patch
@audius/sdk-legacy	Patch
@audius/protocol-dashboard	Patch
@audius/sp-actions	Patch

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