chore: implements populate script

populate-script/.gitignore

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+# General
+yarn-error.log
+node_modules
+.DS_STORE
+.vscode
+
+# Config files
+.env
+
+# Avoid ignoring gitkeep
+!/**/.gitkeep
+
+
+batches.json

populate-script/abis/L2Resolver.json

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+[
+  {
+    "type": "function",
+    "name": "setRecords",
+    "stateMutability": "nonpayable",
+    "inputs": [
+      { "name": "_nodes", "type": "bytes32[]" },
+      { "name": "_keys", "type": "string[]" },
+      { "name": "_values", "type": "bytes[]" }
+    ],
+    "outputs": []
+  }
+]

populate-script/package.json

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+{
+  "name": "populate-script",
+  "version": "1.0.0",
+  "license": "MIT",
+  "main": "script.js",
+  "scripts": {
+    "populate": "ts-node script.ts",
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "@types/node": "24.3.0",
+    "ts-node": "10.9.2",
+    "typescript": "5.9.2",
+    "viem": "2.36.0",
+    "vitest": "3.2.4"
+  }
+}

populate-script/script.ts

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+import { writeFile } from 'node:fs/promises';
+import { encodeAbiParameters, encodeFunctionData, Hex, hexToBytes, keccak256, namehash, numberToHex, stringToBytes, toHex } from 'viem';
+import L2ResolverAbi from '../out/L2Resolver.sol/L2Resolver.json';
+
+type ChainItem = {
+  name: string;
+  chainId: number;
+  subDomain: string;
+  shortName: string;
+};
+
+type BatchOutput = {
+  chainIds: number[];
+  forwardCalldata: Hex;
+  reverseCalldata: Hex;
+};
+
+const SOURCE_URL: string = "https://chainid.network/chains_mini.json";
+const BATCH_SIZE: number = 10;
+const L2_SUFFIX: string = '.l2.eth';
+const CHAIN_IDENTIFIER_EIP7930_KEY: string = 'chain.id.eip7930';
+const REVERSE_LOOKUP_NODE: Hex = keccak256(stringToBytes('reverse.chain.id.eip7930')) as Hex;
+
+/**
+ * Processes a batch of chain items and returns the chainIds, forwardCalldata, and reverseCalldata for setRecords.
+ * @param batch - The batch of chain items to process.
+ * @returns The chainIds, forwardCalldata, and reverseCalldata.
+ */
+const processBatch = async (
+  batch: ChainItem[]
+): Promise<[number[], Hex, Hex]> => {
+  const forwardNodes: Hex[] = [];
+  const forwardKeys: string[] = [];
+  const forwardValues: Hex[] = [];
+
+  const reverseNodes: Hex[] = [];
+  const reverseKeys: string[] = [];
+  const reverseValues: Hex[] = [];
+
+  const chainIds: number[] = [];
+
+  for (const item of batch) {
+    const subDomain = item.subDomain || item.shortName || item.name; // TODO: Review this
+    const domain = `${subDomain}${L2_SUFFIX}`.toLowerCase();
+
+    chainIds.push(item.chainId);
+
+    const nodeNamehash = namehash(domain);
+    const chainIdBytes = encodeEIP7930ChainIdBytes(item.chainId);
+
+    forwardNodes.push(nodeNamehash);
+    forwardKeys.push(CHAIN_IDENTIFIER_EIP7930_KEY);
+    forwardValues.push(chainIdBytes);
+
+    const identifierHash = keccak256(chainIdBytes);
+    const reverseKey = `${CHAIN_IDENTIFIER_EIP7930_KEY}${identifierHash}`;
+    const encodedDomain = encodeAbiParameters([{ type: 'string' }], [domain]);
+
+    reverseNodes.push(REVERSE_LOOKUP_NODE);
+    reverseKeys.push(reverseKey);
+    reverseValues.push(encodedDomain);
+  }
+
+  const forwardCalldata = encodeFunctionData({
+    abi: L2ResolverAbi.abi,
+    functionName: 'setRecords',
+    args: [forwardNodes, forwardKeys, forwardValues],
+  });
+
+  const reverseCalldata = encodeFunctionData({
+    abi: L2ResolverAbi.abi,
+    functionName: 'setRecords',
+    args: [reverseNodes, reverseKeys, reverseValues],
+  });
+
+  return [chainIds, forwardCalldata, reverseCalldata];
+};
+
+const fetchChains = async (): Promise<ChainItem[]> => {
+  const response = await fetch(SOURCE_URL);
+  if (!response.ok) {
+    throw new Error(`Failed to fetch chains: ${response.status} ${response.statusText}`);
+  }
+  return (await response.json()) as ChainItem[];
+};
+
+const filteredChainItem = (item: ChainItem): ChainItem => {
+  return {
+    name: item.name,
+    chainId: item.chainId,
+    subDomain: item.subDomain || '',
+    shortName: item.shortName,
+  };
+};
+
+const chunkArray = <ChainItem>(items: ChainItem[], chunkSize: number): ChainItem[][] => {
+  const chunks: ChainItem[][] = [];
+  for (let i = 0; i < items.length; i += chunkSize) {
+    chunks.push(items.slice(i, i + chunkSize));
+  }
+  return chunks;
+};
+
+/**
+ * Encodes the chainId to the bytes format required by EIP-7930.
+ * Encodes those with:
+ * "parent": { "type": "L2", "chain": "eip155-1", ... }
+ * @param chainId - The chainId to encode.
+ * @returns The encoded bytes.
+ */
+const encodeEIP7930ChainIdBytes = (chainId: number): Hex => {
+  const version = Uint8Array.of(0x00, 0x01);
+  const chainType = Uint8Array.of(0x00, 0x00);
+  const chainRef = hexToBytes(numberToHex(chainId));
+  const chainRefLength = Uint8Array.of(chainRef.length);
+  const addressLength = Uint8Array.of(0x00);
+
+  const bytes = new Uint8Array(version.length + chainType.length + chainRefLength.length + chainRef.length + addressLength.length);
+  bytes.set(version, 0);
+  bytes.set(chainType, 2);
+  bytes.set(chainRefLength, 4);
+  bytes.set(chainRef, 5);
+  bytes.set(addressLength, 5 + chainRef.length);
+
+  return toHex(bytes);
+}
+
+/**
+ * Main function to fetch chains, filter them, and process them in batches.
+ * Writes the outputs to batches.json.
+ */
+const main = async (): Promise<void> => {
+  const chains: ChainItem[] = await fetchChains();
+  const records: ChainItem[] = chains.map(filteredChainItem);
+  const batches: ChainItem[][] = chunkArray(records, BATCH_SIZE);
+
+  const outputs: BatchOutput[] = [];
+  for (const batch of batches) {
+    const [chainIds, forwardCalldata, reverseCalldata] = await processBatch(batch);
+    outputs.push({ chainIds, forwardCalldata, reverseCalldata });
+  }
+
+  await writeFile(
+    'batches.json',
+    JSON.stringify(outputs, null, 2),
+    'utf8'
+  );
+};
+
+main().catch((error) => {
+  console.error(error);
+  process.exitCode = 1;
+});
+
+export { encodeEIP7930ChainIdBytes, processBatch };
+

populate-script/test/script.test.ts

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+import { describe, expect, it } from 'vitest';
+import { encodeEIP7930ChainIdBytes, processBatch } from '../script';
+
+describe('processBatch', () => {
+  it('returns chainIds and encodes forward/reverse calldata', async () => {
+    const batch = [
+      { name: 'OP Mainnet', chainId: 10, subDomain: 'optimism', shortName: 'oeth' },
+      { name: 'Arbitrum One', chainId: 42161, subDomain: 'arbitrum', shortName: 'arb1' },
+    ];
+
+    const [ids, forward, reverse] = await processBatch(batch);
+    expect(ids).toEqual([10, 42161]);
+    expect(forward.startsWith('0x')).toBe(true);
+    expect(reverse.startsWith('0x')).toBe(true);
+  });
+});
+
+describe('encodeEIP7930ChainIdBytes', () => {
+  it('encodes optimism chainId to bytes', async () => {
+    const chainId = 10;
+    const bytes = encodeEIP7930ChainIdBytes(chainId);
+    expect(bytes).toEqual('0x00010000010a00');
+  });
+
+  it('encodes arbitrum chainId to bytes', async () => {
+    const chainId = 42161;
+    const bytes = encodeEIP7930ChainIdBytes(chainId);
+    expect(bytes).toEqual('0x0001000002a4b100');
+  });
+});

populate-script/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "commonjs",
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true
+  }
+}