diff --git a/.prettierignore b/.prettierignore
index 219fcce..dbe2638 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -2,5 +2,4 @@
 artifacts
 cache
 circuits
-scripts
 contracts/verifiers
diff --git a/hardhat.config.js b/hardhat.config.js
index 211079f..74327d4 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -1,3 +1,4 @@
+/* global task, ethers */
 require('@nomiclabs/hardhat-waffle')
 
 // This is a sample Hardhat task. To learn how to create your own go to
diff --git a/scripts/sample-script.js b/scripts/sample-script.js
index 1aa1a24..a58a1f9 100644
--- a/scripts/sample-script.js
+++ b/scripts/sample-script.js
@@ -1,32 +1,32 @@
-// We require the Hardhat Runtime Environment explicitly here. This is optional 
+// We require the Hardhat Runtime Environment explicitly here. This is optional
 // but useful for running the script in a standalone fashion through `node <script>`.
 //
 // When running the script with `hardhat run <script>` you'll find the Hardhat
 // Runtime Environment's members available in the global scope.
-const hre = require("hardhat");
+const hre = require('hardhat')
 
 async function main() {
   // Hardhat always runs the compile task when running scripts with its command
   // line interface.
   //
-  // If this script is run directly using `node` you may want to call compile 
+  // If this script is run directly using `node` you may want to call compile
   // manually to make sure everything is compiled
   // await hre.run('compile');
 
   // We get the contract to deploy
-  const Greeter = await hre.ethers.getContractFactory("Greeter");
-  const greeter = await Greeter.deploy("Hello, Hardhat!");
+  const Greeter = await hre.ethers.getContractFactory('Greeter')
+  const greeter = await Greeter.deploy('Hello, Hardhat!')
 
-  await greeter.deployed();
+  await greeter.deployed()
 
-  console.log("Greeter deployed to:", greeter.address);
+  console.log('Greeter deployed to:', greeter.address)
 }
 
 // We recommend this pattern to be able to use async/await everywhere
 // and properly handle errors.
 main()
   .then(() => process.exit(0))
-  .catch(error => {
-    console.error(error);
-    process.exit(1);
-  });
+  .catch((error) => {
+    console.error(error)
+    process.exit(1)
+  })
diff --git a/src/controller.js b/src/controller.js
index 91a09dc..13784d2 100644
--- a/src/controller.js
+++ b/src/controller.js
@@ -1,7 +1,7 @@
 const ethers = require('ethers')
 const BigNumber = ethers.BigNumber
 
-const { bitsToNumber, toFixedHex, toBuffer, poseidonHash, poseidonHash2 } = require('./utils')
+const { bitsToNumber, toBuffer, poseidonHash } = require('./utils')
 
 const jsSHA = require('jssha')
 
diff --git a/test/pack.test.js b/test/pack.test.js
index a40282e..aaac3c6 100644
--- a/test/pack.test.js
+++ b/test/pack.test.js
@@ -1,9 +1,4 @@
-/* global artifacts, web3, contract */
-const { expect } = require('chai')
-const MerkleTree = require('fixed-merkle-tree')
-const jsSHA = require('jssha')
-const { poseidonHash2 } = require('../src/utils')
-const { batchTreeUpdate, prove } = require('../src/controller')
+/* global ethers */
 
 const instances = [
   '0xc6325fa78E0764993Bf2997116A3771bCbcb3fa9',
@@ -18,11 +13,9 @@ const hashes = [
   '0x57f7b90a3cb4ea6860e6dd5fa44ac4f53ebe6ae3948af577a01ef51738313246',
 ]
 
-const levels = 20
 const CHUNK_TREE_HEIGHT = 7
 describe.skip('Pack', () => {
   it('should work', async () => {
-    const tree = new MerkleTree(levels, [], { hashFunction: poseidonHash2 })
     const Pack = await ethers.getContractFactory('Pack')
     const pack = await Pack.deploy()
 
diff --git a/test/snark.test.js b/test/snark.test.js
index d2e0cbf..f1a3ed3 100644
--- a/test/snark.test.js
+++ b/test/snark.test.js
@@ -1,4 +1,3 @@
-/* global artifacts, web3, contract */
 const { expect } = require('chai')
 const MerkleTree = require('fixed-merkle-tree')
 const { poseidonHash2, randomBN } = require('../src/utils')
@@ -19,5 +18,7 @@ describe('Snark', () => {
     }
     const data = await batchTreeUpdate(tree, events)
     const proof = await prove(data, './artifacts/circuits/BatchTreeUpdate')
+
+    expect(proof.length).to.be.gt(0)
   })
 })
diff --git a/test/tornadoTrees.test.js b/test/tornadoTrees.test.js
index f9c71bc..5f9bc1f 100644
--- a/test/tornadoTrees.test.js
+++ b/test/tornadoTrees.test.js
@@ -1,3 +1,4 @@
+/* global ethers */
 const { expect } = require('chai')
 const { toFixedHex, poseidonHash2, randomBN } = require('../src/utils')
 const MerkleTree = require('fixed-merkle-tree')