Feature: predictAddress token function (#7870)

Author: gregfromstl

.changeset/hot-showers-throw.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Adds predictAddress token extension function

packages/thirdweb/src/exports/tokens.ts

@@ -13,6 +13,7 @@ export {
   getDeployedEntrypointERC20,
 } from "../tokens/get-entrypoint-erc20.js";
 export { isPoolRouterEnabled } from "../tokens/is-router-enabled.js";
+export { predictAddress } from "../tokens/predict-address.js";
 export {
   generateSalt,
   SaltFlag,

packages/thirdweb/src/tokens/predict-address.ts

@@ -0,0 +1,48 @@
+import { bytesToHex, randomBytes } from "@noble/hashes/utils";
+import type { Hex } from "viem";
+import { predictAddress as _predictAddress } from "../extensions/tokens/__generated__/ERC20Entrypoint/read/predictAddress.js";
+import { padHex, toHex } from "../utils/encoding/hex.js";
+import { DEFAULT_DEVELOPER_ADDRESS } from "./constants.js";
+import { getDeployedEntrypointERC20 } from "./get-entrypoint-erc20.js";
+import {
+  encodeInitParams,
+  encodePoolConfig,
+  generateSalt,
+} from "./token-utils.js";
+import type { CreateTokenOptions } from "./types.js";
+
+export async function predictAddress(options: CreateTokenOptions) {
+  const { client, account, params, launchConfig } = options;
+
+  const creator = params.owner || account.address;
+  const encodedInitData = await encodeInitParams({
+    client,
+    creator,
+    params,
+  });
+
+  const salt: Hex = generateSalt(options.salt || bytesToHex(randomBytes(31)));
+
+  const entrypoint = await getDeployedEntrypointERC20(options);
+
+  let hookData: Hex = "0x";
+  let contractId = padHex(toHex("ERC20Asset"), { size: 32 });
+  if (launchConfig?.kind === "pool") {
+    hookData = encodePoolConfig(launchConfig.config);
+    contractId = padHex(toHex("ERC20Asset_Pool"), { size: 32 });
+  }
+
+  const address = await _predictAddress({
+    contract: entrypoint,
+    contractId,
+    params: {
+      data: encodedInitData,
+      hookData,
+      developer: options.developerAddress || DEFAULT_DEVELOPER_ADDRESS,
+      salt,
+    },
+    creator,
+  });
+
+  return address;
+}