chore(contracts): move poseidon creation to compile script

packages/contracts/scripts/compileSol.ts

@@ -1,9 +1,9 @@
+import { poseidonContract } from "circomlibjs";
 import hre from "hardhat";
 
 import fs from "fs";
 import path from "path";
 
-import { buildPoseidonT3, buildPoseidonT4, buildPoseidonT5, buildPoseidonT6 } from "../ts/buildPoseidon";
 import { genZerosContract } from "../ts/genZerosContract";
 
 const PATHS = [
@@ -55,6 +55,17 @@ const ZERO_TREES = [
   },
 ];
 
+type ExtendedHre = typeof hre & { overwriteArtifact: (name: string, code: unknown) => Promise<void> };
+
+const buildPoseidon = async (numInputs: number) => {
+  await (hre as ExtendedHre).overwriteArtifact(`PoseidonT${numInputs + 1}`, poseidonContract.createCode(numInputs));
+};
+
+const buildPoseidonT3 = (): Promise<void> => buildPoseidon(2);
+const buildPoseidonT4 = (): Promise<void> => buildPoseidon(3);
+const buildPoseidonT5 = (): Promise<void> => buildPoseidon(4);
+const buildPoseidonT6 = (): Promise<void> => buildPoseidon(5);
+
 async function main(): Promise<void> {
   await Promise.all(PATHS.map((filepath) => fs.existsSync(filepath) && fs.promises.rm(filepath, { recursive: true })));