--- a/tests/src/benchmarks/mintFee/index.ts
+++ b/tests/src/benchmarks/mintFee/index.ts
@@ -222,9 +222,7 @@
       await collection.mintToken(
         donor,
         {Substrate: susbstrateReceiver.address},
-        PROPERTIES.slice(0, setup.propertiesNumber).map((p) => {
-          return {key: p.key, value: Buffer.from(p.value).toString()};
-        }),
+        PROPERTIES.slice(0, setup.propertiesNumber).map((p) => ({key: p.key, value: Buffer.from(p.value).toString()})),
       );
     },
   );
--- a/tests/src/benchmarks/opsFee/index.ts
+++ b/tests/src/benchmarks/opsFee/index.ts
@@ -379,7 +379,7 @@
   res['setCollectionProperties'].substrate = convertToTokens((await helper.arrange.calculcateFee(
     {Substrate: donor.address},
     () => collection.setProperties(donor, PROPERTIES.slice(0, 1)
-      .map(p => { return {key: p.key, value: p.value.toString()}; })),
+      .map(p => ({key: p.key, value: p.value.toString()}))),
   )));
 
   res['deleteCollectionProperties'].substrate = convertToTokens((await helper.arrange.calculcateFee(
@@ -755,7 +755,7 @@
   res['setCollectionProperties'].substrate = convertToTokens((await helper.arrange.calculcateFee(
     {Substrate: donor.address},
     () => collection.setProperties(donor, PROPERTIES.slice(0, 1)
-      .map(p => { return {key: p.key, value: p.value.toString()}; })),
+      .map(p => ({key: p.key, value: p.value.toString()}))),
   )));
 
   res['deleteCollectionProperties'].substrate = convertToTokens((await helper.arrange.calculcateFee(
--- a/tests/src/benchmarks/utils/common.ts
+++ b/tests/src/benchmarks/utils/common.ts
@@ -5,32 +5,26 @@
 
 export const PROPERTIES = Array(40)
   .fill(0)
-  .map((_, i) => {
-    return {
-      key: `key_${i}`,
-      value: Uint8Array.from(Buffer.from(`value_${i}`)),
-    };
-  });
+  .map((_, i) => ({
+    key: `key_${i}`,
+    value: Uint8Array.from(Buffer.from(`value_${i}`)),
+  }));
 
 export const SUBS_PROPERTIES = Array(40)
   .fill(0)
-  .map((_, i) => {
-    return {
-      key: `key_${i}`,
-      value: `value_${i}`,
-    };
-  });
+  .map((_, i) => ({
+    key: `key_${i}`,
+    value: `value_${i}`,
+  }));
 
-export const PERMISSIONS: ITokenPropertyPermission[] = PROPERTIES.map((p) => {
-  return {
-    key: p.key,
-    permission: {
-      tokenOwner: true,
-      collectionAdmin: true,
-      mutable: true,
-    },
-  };
-});
+export const PERMISSIONS: ITokenPropertyPermission[] = PROPERTIES.map((p) => ({
+  key: p.key,
+  permission: {
+    tokenOwner: true,
+    collectionAdmin: true,
+    mutable: true,
+  },
+}));
 
 export function convertToTokens(value: bigint, nominal = 1000_000_000_000_000_000n): number {
   return Number((value * 1000n) / nominal) / 1000;
--- a/tests/src/eth/collectionAdmin.test.ts
+++ b/tests/src/eth/collectionAdmin.test.ts
@@ -76,9 +76,7 @@
 
       // 2. Expect methods.collectionAdmins == api.rpc.unique.adminlist
       let adminListEth = await collectionEvm.methods.collectionAdmins().call();
-      adminListEth = adminListEth.map((element: IEthCrossAccountId) => {
-        return helper.address.convertCrossAccountFromEthCrossAccount(element);
-      });
+      adminListEth = adminListEth.map((element: IEthCrossAccountId) => helper.address.convertCrossAccountFromEthCrossAccount(element));
       expect(adminListRpc).to.be.like(adminListEth);
 
       // 3. check isOwnerOrAdminCross returns true:
--- a/tests/src/eth/collectionProperties.test.ts
+++ b/tests/src/eth/collectionProperties.test.ts
@@ -181,17 +181,11 @@
       const propertyPermissions = data2?.raw.tokenPropertyPermissions;
       expect(propertyPermissions?.length).to.equal(2);
 
-      expect(propertyPermissions.find((tpp: ITokenPropertyPermission) => {
-        return tpp.key === 'URI' && tpp.permission.mutable && tpp.permission.collectionAdmin && !tpp.permission.tokenOwner;
-      })).to.be.not.null;
+      expect(propertyPermissions.find((tpp: ITokenPropertyPermission) => tpp.key === 'URI' && tpp.permission.mutable && tpp.permission.collectionAdmin && !tpp.permission.tokenOwner)).to.be.not.null;
 
-      expect(propertyPermissions.find((tpp: ITokenPropertyPermission) => {
-        return tpp.key === 'URISuffix' && tpp.permission.mutable && tpp.permission.collectionAdmin && !tpp.permission.tokenOwner;
-      })).to.be.not.null;
+      expect(propertyPermissions.find((tpp: ITokenPropertyPermission) => tpp.key === 'URISuffix' && tpp.permission.mutable && tpp.permission.collectionAdmin && !tpp.permission.tokenOwner)).to.be.not.null;
 
-      expect(data2?.raw.properties?.find((property: IProperty) => {
-        return property.key === 'baseURI' && property.value === BASE_URI;
-      })).to.be.not.null;
+      expect(data2?.raw.properties?.find((property: IProperty) => property.key === 'baseURI' && property.value === BASE_URI)).to.be.not.null;
 
       const token1Result = await contract.methods.mint(bruh).send();
       const tokenId1 = token1Result.events.Transfer.returnValues.tokenId;
--- a/tests/src/eth/evmCoder.test.ts
+++ b/tests/src/eth/evmCoder.test.ts
@@ -17,8 +17,7 @@
 import {IKeyringPair} from '@polkadot/types/types';
 import {itEth, expect, usingEthPlaygrounds} from './util';
 
-const getContractSource = (collectionAddress: string, contractAddress: string): string => {
-  return `
+const getContractSource = (collectionAddress: string, contractAddress: string): string => `
   // SPDX-License-Identifier: MIT
   pragma solidity ^0.8.0;
   interface ITest {
@@ -51,7 +50,6 @@
     }
   }
   `;
-};
 
 
 describe('Evm Coder tests', () => {
--- a/tests/src/eth/nonFungible.test.ts
+++ b/tests/src/eth/nonFungible.test.ts
@@ -102,17 +102,15 @@
       const receiverCrossSub = helper.ethCrossAccount.fromKeyringPair(receiverSub);
 
       // const receiverCross = helper.ethCrossAccount.fromKeyringPair(bob);
-      const properties = Array(5).fill(0).map((_, i) => { return {key: `key_${i}`, value: Buffer.from(`value_${i}`)}; });
+      const properties = Array(5).fill(0).map((_, i) => ({key: `key_${i}`, value: Buffer.from(`value_${i}`)}));
       const permissions: ITokenPropertyPermission[] = properties
-        .map(p => {
-          return {
-            key: p.key, permission: {
-              tokenOwner: false,
-              collectionAdmin: true,
-              mutable: false,
-            },
-          };
-        });
+        .map(p => ({
+          key: p.key, permission: {
+            tokenOwner: false,
+            collectionAdmin: true,
+            mutable: false,
+          },
+        }));
 
       const collection = await helper.nft.mintCollection(minter, {
         tokenPrefix: 'ethp',
@@ -146,7 +144,7 @@
       expect(tokenId).to.be.equal(expectedTokenId);
 
       expect(await contract.methods.properties(tokenId, []).call()).to.be.like(properties
-        .map(p => { return helper.ethProperty.property(p.key, p.value.toString()); }));
+        .map(p => helper.ethProperty.property(p.key, p.value.toString())));
 
       expect(await helper.nft.getTokenOwner(collection.collectionId, tokenId))
         .to.deep.eq(testCase === 'ethereum' ? {Ethereum: receiverEth.toLowerCase()} : {Substrate: receiverSub.address});
--- a/tests/src/eth/reFungible.test.ts
+++ b/tests/src/eth/reFungible.test.ts
@@ -46,12 +46,11 @@
       const receiverSub = bob;
       const receiverCrossSub = helper.ethCrossAccount.fromKeyringPair(receiverSub);
 
-      const properties = Array(5).fill(0).map((_, i) => { return {key: `key_${i}`, value: Buffer.from(`value_${i}`)}; });
-      const permissions: ITokenPropertyPermission[] = properties.map(p => { return {key: p.key, permission: {
+      const properties = Array(5).fill(0).map((_, i) => ({key: `key_${i}`, value: Buffer.from(`value_${i}`)}));
+      const permissions: ITokenPropertyPermission[] = properties.map(p => ({key: p.key, permission: {
         tokenOwner: false,
         collectionAdmin: true,
-        mutable: false}};
-      });
+        mutable: false}}));
 
 
       const collection = await helper.rft.mintCollection(minter, {
@@ -86,7 +85,7 @@
       expect(tokenId).to.be.equal(expectedTokenId);
 
       expect(await contract.methods.properties(tokenId, []).call()).to.be.like(properties
-        .map(p => { return helper.ethProperty.property(p.key, p.value.toString()); }));
+        .map(p => helper.ethProperty.property(p.key, p.value.toString())));
 
       expect(await helper.nft.getTokenOwner(collection.collectionId, tokenId))
         .to.deep.eq(testCase === 'ethereum' ? {Ethereum: receiverEth.toLowerCase()} : {Substrate: receiverSub.address});
--- a/tests/src/eth/tokenProperties.test.ts
+++ b/tests/src/eth/tokenProperties.test.ts
@@ -241,10 +241,10 @@
     itEth.ifWithPallets(`Can be multiple set/read for ${testCase.mode}`, testCase.requiredPallets, async({helper}) => {
       const caller = await helper.eth.createAccountWithBalance(donor);
 
-      const properties = Array(5).fill(0).map((_, i) => { return {key: `key_${i}`, value: Buffer.from(`value_${i}`)}; });
-      const permissions: ITokenPropertyPermission[] = properties.map(p => { return {key: p.key, permission: {tokenOwner: true,
+      const properties = Array(5).fill(0).map((_, i) => ({key: `key_${i}`, value: Buffer.from(`value_${i}`)}));
+      const permissions: ITokenPropertyPermission[] = properties.map(p => ({key: p.key, permission: {tokenOwner: true,
         collectionAdmin: true,
-        mutable: true}}; });
+        mutable: true}}));
 
       const collection = await helper[testCase.mode].mintCollection(alice, {
         tokenPrefix: 'ethp',
@@ -267,10 +267,10 @@
       await contract.methods.setProperties(token.tokenId, properties).send({from: caller});
 
       const values = await token.getProperties(properties.map(p => p.key));
-      expect(values).to.be.deep.equal(properties.map(p => { return {key: p.key, value: p.value.toString()}; }));
+      expect(values).to.be.deep.equal(properties.map(p => ({key: p.key, value: p.value.toString()})));
 
       expect(await contract.methods.properties(token.tokenId, []).call()).to.be.like(properties
-        .map(p => { return helper.ethProperty.property(p.key, p.value.toString()); }));
+        .map(p => helper.ethProperty.property(p.key, p.value.toString())));
 
       expect(await contract.methods.properties(token.tokenId, [properties[0].key]).call())
         .to.be.like([helper.ethProperty.property(properties[0].key, properties[0].value.toString())]);
--- a/tests/src/fungible.test.ts
+++ b/tests/src/fungible.test.ts
@@ -46,7 +46,7 @@
 
   itSub('RPC method tokenOnewrs for fungible collection and token', async ({helper}) => {
     const ethAcc = {Ethereum: '0x67fb3503a61b284dc83fa96dceec4192db47dc7c'};
-    const facelessCrowd = (await helper.arrange.createAccounts(Array(7).fill(0n), donor)).map(keyring => {return {Substrate: keyring.address};});
+    const facelessCrowd = (await helper.arrange.createAccounts(Array(7).fill(0n), donor)).map(keyring => ({Substrate: keyring.address}));
 
     const collection = await helper.ft.mintCollection(alice, {name: 'test', description: 'test', tokenPrefix: 'test'});
 
--- a/tests/src/getPropertiesRpc.test.ts
+++ b/tests/src/getPropertiesRpc.test.ts
@@ -48,17 +48,13 @@
 describe('query properties RPC', () => {
   let alice: IKeyringPair;
 
-  const mintCollection = async (helper: UniqueHelper) => {
-    return await helper.nft.mintCollection(alice, {
-      tokenPrefix: 'prps',
-      properties: collectionProps,
-      tokenPropertyPermissions: tokenPropPermissions,
-    });
-  };
+  const mintCollection = async (helper: UniqueHelper) => await helper.nft.mintCollection(alice, {
+    tokenPrefix: 'prps',
+    properties: collectionProps,
+    tokenPropertyPermissions: tokenPropPermissions,
+  });
 
-  const mintToken = async (collection: UniqueNFTCollection) => {
-    return await collection.mintToken(alice, {Substrate: alice.address}, tokenProps);
-  };
+  const mintToken = async (collection: UniqueNFTCollection) => await collection.mintToken(alice, {Substrate: alice.address}, tokenProps);
 
 
   before(async () => {
--- a/tests/src/nesting/tokenProperties.test.ts
+++ b/tests/src/nesting/tokenProperties.test.ts
@@ -44,7 +44,7 @@
   async function mintCollectionWithAllPermissionsAndToken(helper: UniqueHelper, mode: 'NFT' | 'RFT'): Promise<[UniqueNFToken | UniqueRFToken, bigint]> {
     const collection = await (mode == 'NFT' ? helper.nft : helper.rft).mintCollection(alice, {
       tokenPropertyPermissions: permissions.flatMap(({permission, signers}, i) =>
-        signers.map(signer => {return {key: `${i+1}_${signer.address}`, permission};})),
+        signers.map(signer => ({key: `${i+1}_${signer.address}`, permission}))),
     });
     return mode == 'NFT' ? [await collection.mintToken(alice), 1n] : [await collection.mintToken(alice, 100n as any), 100n];
   }
@@ -201,7 +201,7 @@
     const collectionA = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
     const collectionB = await helper.nft.mintCollection(alice, {
       tokenPropertyPermissions: permissions.flatMap(({permission, signers}, i) =>
-        signers.map(signer => {return {key: `${i+1}_${signer.address}`, permission};})),
+        signers.map(signer => ({key: `${i+1}_${signer.address}`, permission}))),
     });
     const targetToken = await collectionA.mintToken(alice);
     const nestedToken = await collectionB.mintToken(alice, targetToken.nestingAccount());
@@ -239,7 +239,7 @@
     const collectionA = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
     const collectionB = await helper.nft.mintCollection(alice, {
       tokenPropertyPermissions: permissions.flatMap(({permission, signers}, i) =>
-        signers.map(signer => {return {key: `${i+1}_${signer.address}`, permission};})),
+        signers.map(signer => ({key: `${i+1}_${signer.address}`, permission}))),
     });
     const targetToken = await collectionA.mintToken(alice);
     const nestedToken = await collectionB.mintToken(alice, targetToken.nestingAccount());
@@ -284,7 +284,7 @@
     const collectionA = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
     const collectionB = await helper.nft.mintCollection(alice, {
       tokenPropertyPermissions: permissions.flatMap(({permission, signers}, i) =>
-        signers.map(signer => {return {key: `${i+1}_${signer.address}`, permission};})),
+        signers.map(signer => ({key: `${i+1}_${signer.address}`, permission}))),
     });
     const targetToken = await collectionA.mintToken(alice);
     const nestedToken = await collectionB.mintToken(alice, targetToken.nestingAccount());
@@ -477,7 +477,7 @@
 
   async function mintCollectionWithAllPermissionsAndToken(helper: UniqueHelper, mode: 'NFT' | 'RFT'): Promise<[UniqueNFToken | UniqueRFToken, bigint]> {
     const collection = await (mode == 'NFT' ? helper.nft : helper.rft).mintCollection(alice, {
-      tokenPropertyPermissions: constitution.map(({permission}, i) => {return {key: `${i+1}`, permission};}),
+      tokenPropertyPermissions: constitution.map(({permission}, i) => ({key: `${i+1}`, permission})),
     });
     return mode == 'NFT' ? [await collection.mintToken(alice), 1n] : [await collection.mintToken(alice, 100n as any), 100n];
   }
--- a/tests/src/refungible.test.ts
+++ b/tests/src/refungible.test.ts
@@ -64,7 +64,7 @@
 
   itSub('RPC method tokenOwners for refungible collection and token', async ({helper}) => {
     const ethAcc = {Ethereum: '0x67fb3503a61b284dc83fa96dceec4192db47dc7c'};
-    const facelessCrowd = (await helper.arrange.createAccounts(Array(7).fill(0n), donor)).map(keyring => {return {Substrate: keyring.address};});
+    const facelessCrowd = (await helper.arrange.createAccounts(Array(7).fill(0n), donor)).map(keyring => ({Substrate: keyring.address}));
 
     const collection = await helper.rft.mintCollection(alice, {name: 'test', description: 'test', tokenPrefix: 'test'});
 
--- a/tests/src/rpc.test.ts
+++ b/tests/src/rpc.test.ts
@@ -40,7 +40,7 @@
     // Set-up a few token owners of all stripes
     const ethAcc = {Ethereum: '0x67fb3503a61b284dc83fa96dceec4192db47dc7c'};
     const facelessCrowd = (await helper.arrange.createAccounts([0n, 0n, 0n, 0n, 0n, 0n, 0n], donor))
-      .map(i => {return {Substrate: i.address};});
+      .map(i => ({Substrate: i.address}));
 
     const collection = await helper.ft.mintCollection(alice, {name: 'RPC-2', tokenPrefix: 'RPC'});
     // mint some maximum (u128) amounts of tokens possible
--- a/tests/src/sub/appPromotion/appPromotion.test.ts
+++ b/tests/src/sub/appPromotion/appPromotion.test.ts
@@ -357,11 +357,9 @@
         const stakers = await getAccounts(3);
 
         await Promise.all(stakers.map(staker => helper.staking.stake(staker, 100n * nominal)));
-        await Promise.all(stakers.map(staker => {
-          return testCase.method === 'unstakeAll'
-            ? helper.staking.unstakeAll(staker)
-            : helper.staking.unstakePartial(staker, 100n * nominal);
-        }));
+        await Promise.all(stakers.map(staker => testCase.method === 'unstakeAll'
+          ? helper.staking.unstakeAll(staker)
+          : helper.staking.unstakePartial(staker, 100n * nominal)));
 
         await Promise.all(stakers.map(async (staker) => {
           expect(await helper.staking.getPendingUnstake({Substrate: staker.address})).to.be.equal(100n * nominal);
@@ -375,11 +373,9 @@
         const stakers = await getAccounts(10);
 
         await Promise.all(stakers.map(staker => helper.staking.stake(staker, 100n * nominal)));
-        const unstakingResults = await Promise.allSettled(stakers.map((staker, i) => {
-          return i % 2 === 0
-            ? helper.staking.unstakeAll(staker)
-            : helper.staking.unstakePartial(staker, 100n * nominal);
-        }));
+        const unstakingResults = await Promise.allSettled(stakers.map((staker, i) => i % 2 === 0
+          ? helper.staking.unstakeAll(staker)
+          : helper.staking.unstakePartial(staker, 100n * nominal)));
 
         const successfulUnstakes = unstakingResults.filter(result => result.status === 'fulfilled');
         expect(successfulUnstakes).to.have.length(3);
--- a/tests/src/util/index.ts
+++ b/tests/src/util/index.ts
@@ -19,13 +19,9 @@
 chai.use(chaiSubset);
 export const expect = chai.expect;
 
-const getTestHash = (filename: string) => {
-  return crypto.createHash('md5').update(filename).digest('hex');
-};
+const getTestHash = (filename: string) => crypto.createHash('md5').update(filename).digest('hex');
 
-export const getTestSeed = (filename: string) => {
-  return `//Alice+${getTestHash(filename)}`;
-};
+export const getTestSeed = (filename: string) => `//Alice+${getTestHash(filename)}`;
 
 async function usingPlaygroundsGeneral<T extends ChainHelperBase>(helperType: new(logger: ILogger) => T, url: string, code: (helper: T, privateKey: (seed: string | {filename?: string, url?: string, ignoreFundsPresence?: boolean}) => Promise<IKeyringPair>) => Promise<void>) {
   const silentConsole = new SilentConsole();
@@ -65,49 +61,27 @@
   }
 }
 
-export const usingPlaygrounds = (code: (helper: DevUniqueHelper, privateKey: (seed: string | {filename?: string, url?: string, ignoreFundsPresence?: boolean}) => Promise<IKeyringPair>) => Promise<void>, url: string = config.substrateUrl) => {
-  return usingPlaygroundsGeneral<DevUniqueHelper>(DevUniqueHelper, url, code);
-};
+export const usingPlaygrounds = (code: (helper: DevUniqueHelper, privateKey: (seed: string | {filename?: string, url?: string, ignoreFundsPresence?: boolean}) => Promise<IKeyringPair>) => Promise<void>, url: string = config.substrateUrl) => usingPlaygroundsGeneral<DevUniqueHelper>(DevUniqueHelper, url, code);
 
-export const usingWestmintPlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevWestmintHelper>(DevWestmintHelper, url, code);
-};
+export const usingWestmintPlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevWestmintHelper>(DevWestmintHelper, url, code);
 
-export const usingStateminePlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevStatemineHelper>(DevWestmintHelper, url, code);
-};
+export const usingStateminePlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevStatemineHelper>(DevWestmintHelper, url, code);
 
-export const usingStatemintPlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevStatemintHelper>(DevWestmintHelper, url, code);
-};
+export const usingStatemintPlaygrounds = (url: string, code: (helper: DevWestmintHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevStatemintHelper>(DevWestmintHelper, url, code);
 
-export const usingRelayPlaygrounds = (url: string, code: (helper: DevRelayHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevRelayHelper>(DevRelayHelper, url, code);
-};
+export const usingRelayPlaygrounds = (url: string, code: (helper: DevRelayHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevRelayHelper>(DevRelayHelper, url, code);
 
-export const usingAcalaPlaygrounds = (url: string, code: (helper: DevAcalaHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevAcalaHelper>(DevAcalaHelper, url, code);
-};
+export const usingAcalaPlaygrounds = (url: string, code: (helper: DevAcalaHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevAcalaHelper>(DevAcalaHelper, url, code);
 
-export const usingKaruraPlaygrounds = (url: string, code: (helper: DevKaruraHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevKaruraHelper>(DevAcalaHelper, url, code);
-};
+export const usingKaruraPlaygrounds = (url: string, code: (helper: DevKaruraHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevKaruraHelper>(DevAcalaHelper, url, code);
 
-export const usingMoonbeamPlaygrounds = (url: string, code: (helper: DevMoonbeamHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevMoonbeamHelper>(DevMoonbeamHelper, url, code);
-};
+export const usingMoonbeamPlaygrounds = (url: string, code: (helper: DevMoonbeamHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevMoonbeamHelper>(DevMoonbeamHelper, url, code);
 
-export const usingMoonriverPlaygrounds = (url: string, code: (helper: DevMoonbeamHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevMoonriverHelper>(DevMoonriverHelper, url, code);
-};
+export const usingMoonriverPlaygrounds = (url: string, code: (helper: DevMoonbeamHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevMoonriverHelper>(DevMoonriverHelper, url, code);
 
-export const usingAstarPlaygrounds = (url: string, code: (helper: DevAstarHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevAstarHelper>(DevAstarHelper, url, code);
-};
+export const usingAstarPlaygrounds = (url: string, code: (helper: DevAstarHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevAstarHelper>(DevAstarHelper, url, code);
 
-export const usingShidenPlaygrounds = (url: string, code: (helper: DevShidenHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => {
-  return usingPlaygroundsGeneral<DevShidenHelper>(DevShidenHelper, url, code);
-};
+export const usingShidenPlaygrounds = (url: string, code: (helper: DevShidenHelper, privateKey: (seed: string) => Promise<IKeyringPair>) => Promise<void>) => usingPlaygroundsGeneral<DevShidenHelper>(DevShidenHelper, url, code);
 
 export const MINIMUM_DONOR_FUND = 100_000n;
 export const DONOR_FUNDING = 2_000_000n;
--- a/tests/src/util/playgrounds/unique.dev.ts
+++ b/tests/src/util/playgrounds/unique.dev.ts
@@ -771,9 +771,7 @@
     // <<< Referendum voting <<<
 
     // Wait the proposal to pass
-    await this.helper.wait.expectEvent(3, Event.Democracy.Passed, event => {
-      return event.referendumIndex() == referendumIndex;
-    });
+    await this.helper.wait.expectEvent(3, Event.Democracy.Passed, event => event.referendumIndex() == referendumIndex);
 
     await this.helper.wait.newBlocks(1);
 
@@ -924,7 +922,7 @@
   event<T extends IEventHelper>(
     maxBlocksToWait: number,
     eventHelperType: new () => T,
-    filter: (_: T) => boolean = () => { return true; },
+    filter: (_: T) => boolean = () => true,
   ) {
     // eslint-disable-next-line no-async-promise-executor
     const promise = new Promise<T | null>(async (resolve) => {
@@ -970,7 +968,7 @@
   async expectEvent<T extends IEventHelper>(
     maxBlocksToWait: number,
     eventHelperType: new () => T,
-    filter: (e: T) => boolean = () => { return true; },
+    filter: (e: T) => boolean = () => true,
   ) {
     const e = await this.event(maxBlocksToWait, eventHelperType, filter);
     if (e == null) {
@@ -1077,9 +1075,7 @@
   async startCapture() {
     this.stopCapture();
     this.unsubscribe = (await this.helper.getApi().query.system.events((eventRecords: FrameSystemEventRecord[]) => {
-      const newEvents = eventRecords.filter(r => {
-        return r.event.section == this.eventSection && r.event.method == this.eventMethod;
-      });
+      const newEvents = eventRecords.filter(r => r.event.section == this.eventSection && r.event.method == this.eventMethod);
 
       this.events.push(...newEvents);
     })) as any;
@@ -1105,12 +1101,10 @@
 
   async payoutStakers(signer: IKeyringPair, stakersToPayout: number):  Promise<{staker: string, stake: bigint, payout: bigint}[]> {
     const payoutResult = await this.helper.executeExtrinsic(signer, 'api.tx.appPromotion.payoutStakers', [stakersToPayout], true);
-    return payoutResult.result.events.filter(e => e.event.method === 'StakingRecalculation').map(e => {
-      return {
-        staker: e.event.data[0].toString(),
-        stake: e.event.data[1].toBigInt(),
-        payout: e.event.data[2].toBigInt(),
-      };
-    });
+    return payoutResult.result.events.filter(e => e.event.method === 'StakingRecalculation').map(e => ({
+      staker: e.event.data[0].toString(),
+      stake: e.event.data[1].toBigInt(),
+      payout: e.event.data[2].toBigInt(),
+    }));
   }
 }
--- a/tests/src/util/playgrounds/unique.ts
+++ b/tests/src/util/playgrounds/unique.ts
@@ -2395,7 +2395,7 @@
     return total.toBigInt();
   }
 
-  async getLocked(address: TSubstrateAccount): Promise<[{ id: string, amount: bigint, reason: string }]> {
+  async getLocked(address: TSubstrateAccount): Promise<{ id: string, amount: bigint, reason: string }[]> {
     const locks = (await this.helper.callRpc('api.query.balances.locks', [address])).toHuman();
     return locks.map((lock: any) => ({id: lock.id, amount: BigInt(lock.amount.replace(/,/g, '')), reasons: lock.reasons}));
   }
@@ -2581,14 +2581,12 @@
    */
   async getVestingSchedules(address: TSubstrateAccount): Promise<{ start: bigint, period: bigint, periodCount: bigint, perPeriod: bigint }[]> {
     const schedule = (await this.helper.callRpc('api.query.vesting.vestingSchedules', [address])).toJSON();
-    return schedule.map((schedule: any) => {
-      return {
-        start: BigInt(schedule.start),
-        period: BigInt(schedule.period),
-        periodCount: BigInt(schedule.periodCount),
-        perPeriod: BigInt(schedule.perPeriod),
-      };
-    });
+    return schedule.map((schedule: any) => ({
+      start: BigInt(schedule.start),
+      period: BigInt(schedule.period),
+      periodCount: BigInt(schedule.periodCount),
+      perPeriod: BigInt(schedule.perPeriod),
+    }));
   }
 
   /**
@@ -2804,12 +2802,10 @@
    */
   async getTotalStakedPerBlock(address: ICrossAccountId): Promise<IStakingInfo[]> {
     const rawTotalStakerdPerBlock = await this.helper.callRpc('api.rpc.appPromotion.totalStakedPerBlock', [address]);
-    return rawTotalStakerdPerBlock.map(([block, amount]: any[]) => {
-      return {
-        block: block.toBigInt(),
-        amount: amount.toBigInt(),
-      };
-    });
+    return rawTotalStakerdPerBlock.map(([block, amount]: any[]) => ({
+      block: block.toBigInt(),
+      amount: amount.toBigInt(),
+    }));
   }
 
   /**
@@ -2828,12 +2824,10 @@
    */
   async getPendingUnstakePerBlock(address: ICrossAccountId): Promise<IStakingInfo[]> {
     const rawUnstakedPerBlock = await this.helper.callRpc('api.rpc.appPromotion.pendingUnstakePerBlock', [address]);
-    const result = rawUnstakedPerBlock.map(([block, amount]: any[]) => {
-      return {
-        block: block.toBigInt(),
-        amount: amount.toBigInt(),
-      };
-    });
+    const result = rawUnstakedPerBlock.map(([block, amount]: any[]) => ({
+      block: block.toBigInt(),
+      amount: amount.toBigInt(),
+    }));
     return result;
   }
 }
--- a/tests/src/xcm/xcmQuartz.test.ts
+++ b/tests/src/xcm/xcmQuartz.test.ts
@@ -682,10 +682,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -765,10 +763,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -780,10 +776,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -858,10 +852,8 @@
   });
 
   const expectFailedToTransact = async (helper: DevUniqueHelper, messageSent: any) => {
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == messageSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == messageSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
   };
 
   itSub('Quartz rejects KAR tokens from Karura', async ({helper}) => {
@@ -1172,10 +1164,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -1263,10 +1253,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1282,10 +1270,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1544,10 +1530,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -1627,10 +1611,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1642,10 +1624,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
--- a/tests/src/xcm/xcmUnique.test.ts
+++ b/tests/src/xcm/xcmUnique.test.ts
@@ -684,10 +684,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -767,10 +765,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -782,10 +778,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -860,10 +854,8 @@
   });
 
   const expectFailedToTransact = async (helper: DevUniqueHelper, messageSent: any) => {
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == messageSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == messageSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
   };
 
   itSub('Unique rejects ACA tokens from Acala', async ({helper}) => {
@@ -1175,10 +1167,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -1266,10 +1256,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1285,10 +1273,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1546,10 +1532,8 @@
       maliciousXcmProgramSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramSent.messageHash()
-        && event.outcome().isFailedToTransactAsset;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramSent.messageHash()
+        && event.outcome().isFailedToTransactAsset);
 
     targetAccountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(targetAccountBalance).to.be.equal(0n);
@@ -1629,10 +1613,8 @@
       maliciousXcmProgramFullIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramFullIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     let accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);
@@ -1644,10 +1626,8 @@
       maliciousXcmProgramHereIdSent = await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.XcmpMessageSent);
     });
 
-    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => {
-      return event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
-        && event.outcome().isUntrustedReserveLocation;
-    });
+    await helper.wait.expectEvent(maxWaitBlocks, Event.XcmpQueue.Fail, event => event.messageHash() == maliciousXcmProgramHereIdSent.messageHash()
+        && event.outcome().isUntrustedReserveLocation);
 
     accountBalance = await helper.balance.getSubstrate(targetAccount.address);
     expect(accountBalance).to.be.equal(0n);