docs(embedded-wallets): fix broken EVM snippets in integration guide

[callumweb3]

Description

Fixes several broken snippets in
embedded-wallets/sdk/js/_ethereum-integration-snippets.mdx. All issues verified locally with Node.js v24 and ethers 6.17.0.

Fixes

1. Deploy contract (ethers) - SyntaxError + ethers v5 API

const address = signer.getAddress();
const contractFactory = new ContractFactory(JSON.parse(JSON.stringify(contractABI), contractByteCode, address);
const contract = await contractFactory.deploy("Hello World!");
const receipt = await contract.deployed();

• Unbalanced parentheses: ContractFactory( and JSON.parse( are opened, only one is closed. node --check reports SyntaxError: missing ) after argument list.
• JSON.parse receives three arguments - (text, reviver) only; contractByteCode lands in reviver, address is ignored.
• JSON.parse(JSON.stringify(contractABI)) is unnecessary - ABI is already an array, ethers v6 accepts it directly.
• signer.getAddress() is missing await (returns Promise<string> in v6), and the variable is unused in the snippet.
• contract.deployed() is v5 API. In ethers 6.17.0 Contract.prototype.deployed is undefined; the v6 replacement is waitForDeployment() + getAddress().
• signer was not defined in this snippet - added new ethers.BrowserProvider(provider) + getSigner(), matching the other ethers snippets in the file.

After:

const contractFactory = new ContractFactory(contractABI, contractByteCode, signer);
const contract = await contractFactory.deploy("Hello World!");
await contract.waitForDeployment();
const deployedContractAddress = await contract.getAddress();

2. Deploy contract (viem) - stray this.

const publicClient = createPublicClient({
  chain: this.getViewChain(),
  transport: custom(provider),
})
...
abi: this.contractABI,
bytecode: this.contractByteCode,

In an ESM module this is undefined inside a plain function, so these lines throw
TypeError: Cannot read properties of undefined (reading 'getViewChain'). Replaced with mainnet, contractABI, contractByteCode (already declared above in the same snippet), matching the other viem tabs.

3. Write to contract (viem) - undeclared address

address = await walletClient.getAddresses()

Missing const - ReferenceError: address is not defined under ESM. Fixed to const address = ..., consistent with the rest of the file.

4. Read / Write contract (ethers) - drop redundant ABI round-trip

JSON.parse(JSON.stringify(contractABI)) removed from both new ethers.Contract(...) calls. Aligned with fix #1.

Scope

• Documentation only; one file; four logical changes.
• No behavior change.

Verification

Reproduced with Node.js v24.13.1 and ethers 6.17.0:

• node --check on the current Deploy (ethers) snippet > SyntaxError: missing ) after argument list:

• typeof ethers.Contract.prototype.deployed === "undefined", typeof ethers.BaseContract.prototype.waitForDeployment === "function".
• const address = signer.getAddress() → typeof address === "object", address instanceof Promise === true; with await → typeof === "string".

---

Note

Low Risk
Documentation-only edits to example snippets; no runtime or product code paths change.

Overview
Repairs the ethers.js deploy contract example in _ethereum-integration-snippets.mdx so it matches ethers v6 and parses as valid JavaScript.

The broken ContractFactory(JSON.parse(JSON.stringify(contractABI), contractByteCode, address) call (unbalanced parentheses and wrong arguments) is replaced with new ContractFactory(contractABI, contractByteCode, signer). Post-deploy steps use waitForDeployment() and await contract.getAddress() instead of the v5 deployed() / receipt.contractAddress pattern. The unused signer.getAddress() line tied to that mistake is removed.

^{Reviewed by Cursor Bugbot for commit ca97a02. Bugbot is set up for automated code reviews on this repo. Configure here.}

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