diff --git a/apps/api/src/currentConfig.ts b/apps/api/src/currentConfig.ts
index 6191e3762..06a431238 100644
--- a/apps/api/src/currentConfig.ts
+++ b/apps/api/src/currentConfig.ts
@@ -4,11 +4,13 @@ import { networkNodeUrl, networkProperties } from './overrrides';
 export default {
   ...baseConfig,
   network_node_url: networkNodeUrl,
-  sources: [
-    {
-      ...baseConfig.sources[0],
+  sources: baseConfig.sources.map((source, i) => {
+    if (i !== 0) return source;
+
+    return {
+      ...source,
       contract: networkProperties.factoryAddress,
       start: networkProperties.startBlock
-    }
-  ]
+    };
+  })
 };
diff --git a/apps/api/src/utils.ts b/apps/api/src/utils.ts
index 92d35f552..0494fd941 100644
--- a/apps/api/src/utils.ts
+++ b/apps/api/src/utils.ts
@@ -1,5 +1,5 @@
 import fetch from 'cross-fetch';
-import { CallData, Contract, Provider, hash, shortString } from 'starknet';
+import { BigNumberish, CallData, Contract, Provider, hash, shortString } from 'starknet';
 import { Contract as EthContract } from '@ethersproject/contracts';
 import { JsonRpcProvider } from '@ethersproject/providers';
 import { faker } from '@faker-js/faker';
@@ -17,6 +17,11 @@ import SimpleQuorumExecutionStrategyAbi from './abis/l1/SimpleQuorumExecutionStr
 import { networkNodeUrl, networkProperties } from './overrrides';
 import { handleStrategiesParsedMetadata } from './ipfs';
 
+type StrategyConfig = {
+  address: BigNumberish;
+  params: BigNumberish[];
+};
+
 const ethProvider = new JsonRpcProvider(
   process.env.L1_NETWORK_NODE_URL ?? 'https://rpc.brovider.xyz/5'
 );
@@ -32,7 +37,7 @@ export function getCurrentTimestamp() {
   return Math.floor(Date.now() / 1000);
 }
 
-export function toAddress(bn) {
+export function toAddress(bn: any) {
   try {
     return getAddress(BigNumber.from(bn).toHexString());
   } catch (e) {
@@ -40,7 +45,7 @@ export function toAddress(bn) {
   }
 }
 
-export function getUrl(uri, gateway = 'pineapple.fyi') {
+export function getUrl(uri: string, gateway = 'pineapple.fyi') {
   const ipfsGateway = `https://${gateway}`;
   if (!uri) return null;
   if (
@@ -56,12 +61,14 @@ export function getUrl(uri, gateway = 'pineapple.fyi') {
   return uri;
 }
 
-export async function getJSON(uri) {
+export async function getJSON(uri: string) {
   const url = getUrl(uri);
+  if (!url) throw new Error('Invalid URI');
+
   return fetch(url).then(res => res.json());
 }
 
-export function getSpaceName(address) {
+export function getSpaceName(address: string) {
   const seed = parseInt(hash.getSelectorFromName(address).toString().slice(0, 12));
   faker.seed(seed);
   const noun = faker.word.noun(6);
@@ -109,6 +116,7 @@ export async function handleExecutionStrategy(address: string, payload: string[]
       quorum = await executionContract.quorum();
     } else if (executionStrategyType === 'EthRelayer') {
       const [l1Destination] = payload;
+      if (!l1Destination) throw new Error('Invalid payload for EthRelayer execution strategy');
 
       const SimpleQuorumExecutionStrategyContract = new EthContract(
         l1Destination,
@@ -154,10 +162,11 @@ export async function updateProposaValidationStrategy(
     if (Object.keys(parsed).length !== 0) {
       space.proposal_threshold = parsed.proposal_threshold;
       space.voting_power_validation_strategy_strategies = parsed.allowed_strategies.map(
-        strategy => `0x${strategy.address.toString(16)}`
+        (strategy: StrategyConfig) => `0x${strategy.address.toString(16)}`
       );
       space.voting_power_validation_strategy_strategies_params = parsed.allowed_strategies.map(
-        strategy => strategy.params.map(param => `0x${param.toString(16)}`).join(',')
+        (strategy: StrategyConfig) =>
+          strategy.params.map(param => `0x${param.toString(16)}`).join(',')
       );
     }
 
@@ -182,6 +191,7 @@ export async function handleStrategiesMetadata(
 ) {
   for (let i = 0; i < metadataUris.length; i++) {
     const metadataUri = metadataUris[i];
+    if (!metadataUri) continue;
 
     const index = startingIndex + i;
     const uniqueId = `${spaceId}/${index}/${dropIpfs(metadataUri)}`;
diff --git a/apps/api/src/writer.ts b/apps/api/src/writer.ts
index cc4ace338..d22516c35 100644
--- a/apps/api/src/writer.ts
+++ b/apps/api/src/writer.ts
@@ -15,6 +15,11 @@ import {
   registerProposal
 } from './utils';
 
+type Strategy = {
+  address: string;
+  params: string[];
+};
+
 export const handleSpaceDeployed: CheckpointWriter = async ({ blockNumber, event, instance }) => {
   console.log('Handle space deployed');
 
@@ -31,9 +36,13 @@ export const handleSpaceCreated: CheckpointWriter = async ({ block, tx, event })
 
   if (!event || !tx.transaction_hash) return;
 
-  const strategies: string[] = event.voting_strategies.map(strategy => strategy.address);
-  const strategiesParams = event.voting_strategies.map(strategy => strategy.params.join(',')); // different format than sx-evm
-  const strategiesMetadataUris = event.voting_strategy_metadata_uris.map(array =>
+  const strategies: string[] = event.voting_strategies.map(
+    (strategy: Strategy) => strategy.address
+  );
+  const strategiesParams = event.voting_strategies.map((strategy: Strategy) =>
+    strategy.params.join(',')
+  ); // different format than sx-evm
+  const strategiesMetadataUris = event.voting_strategy_metadata_uris.map((array: string[]) =>
     longStringToText(array)
   );
 
@@ -207,9 +216,13 @@ export const handleVotingStrategiesAdded: CheckpointWriter = async ({ rawEvent,
 
   const initialNextStrategy = space.next_strategy_index;
 
-  const strategies = event.voting_strategies.map(strategy => strategy.address);
-  const strategiesParams = event.voting_strategies.map(strategy => strategy.params.join(','));
-  const strategiesMetadataUris = event.voting_strategy_metadata_uris.map(array =>
+  const strategies: string[] = event.voting_strategies.map(
+    (strategy: Strategy) => strategy.address
+  );
+  const strategiesParams = event.voting_strategies.map((strategy: Strategy) =>
+    strategy.params.join(',')
+  );
+  const strategiesMetadataUris = event.voting_strategy_metadata_uris.map((array: string[]) =>
     longStringToText(array)
   );
 
@@ -364,7 +377,11 @@ export const handlePropose: CheckpointWriter = async ({ block, tx, rawEvent, eve
 
   for (const herodotusStrategy of herodotusStrategiesIndicies) {
     const [strategy, i] = herodotusStrategy;
-    const [l1TokenAddress] = space.strategies_params[i].split(',');
+    const params = space.strategies_params[i];
+    if (!params) continue;
+
+    const [l1TokenAddress] = params.split(',');
+    if (!l1TokenAddress) continue;
 
     try {
       await registerProposal({
@@ -495,8 +512,8 @@ export const handleVote: CheckpointWriter = async ({ block, tx, rawEvent, event
   if (proposal) {
     proposal.vote_count += 1;
     proposal.scores_total = (BigInt(proposal.scores_total) + BigInt(vote.vp)).toString();
-    proposal[`scores_${vote.choice}`] = (
-      BigInt(proposal[`scores_${vote.choice}`]) + BigInt(vote.vp)
+    proposal[`scores_${choice}`] = (
+      BigInt(proposal[`scores_${choice}`]) + BigInt(vote.vp)
     ).toString();
     await proposal.save();
   }
diff --git a/apps/api/test/unit/writer.test.ts b/apps/api/test/unit/writer.test.ts
index d66d421ba..0576d44f2 100644
--- a/apps/api/test/unit/writer.test.ts
+++ b/apps/api/test/unit/writer.test.ts
@@ -1,9 +1,14 @@
 import { describe, it, expect } from 'vitest';
 import { mockDeep } from 'vitest-mock-extended';
-import { AsyncMySqlPool } from '@snapshot-labs/checkpoint';
+import Checkpoint, { CheckpointWriter, AsyncMySqlPool } from '@snapshot-labs/checkpoint';
 import { validateAndParseAddress } from 'starknet';
 
-async function handleDeploy({ source, block, tx, mysql }) {
+type Block = Parameters<CheckpointWriter>[0]['block'];
+type Transaction = Parameters<CheckpointWriter>[0]['tx'];
+
+const handleDeploy: CheckpointWriter = async ({ source, block, tx, mysql }) => {
+  if (!source || !block) return;
+
   console.log('Handle deploy');
   const item = {
     id: validateAndParseAddress(source.contract),
@@ -18,29 +23,33 @@ async function handleDeploy({ source, block, tx, mysql }) {
   };
   const query = `INSERT IGNORE INTO spaces SET ?;`;
   await mysql.queryAsync(query, [item]);
-}
+};
 
 describe('handleDeploy', () => {
   it('should create space with correct parameters', async () => {
     // TODO: Replace inputs with typed mocks
 
     const source = {
-      contract: '0x0625dc1290b6e936be5f1a3e963cf629326b1f4dfd5a56738dea98e1ad31b7f'
+      contract: '0x0625dc1290b6e936be5f1a3e963cf629326b1f4dfd5a56738dea98e1ad31b7f',
+      start: 1,
+      events: []
     };
 
-    const block = {
+    const block = mockDeep<Block>({
       timestamp: 1652650963200
-    };
-
-    const tx = {
+    });
+    const tx = mockDeep<Transaction>({
       transaction_hash: '0xabbb5161c49978ffc76369df76cdb40683e33c09145a9681553fe8e9c9a96a46'
-    };
-
+    });
+    const mockInstance = mockDeep<Checkpoint>();
     const mockMysql = mockDeep<AsyncMySqlPool>();
 
     await handleDeploy({
       source,
       block,
+      blockNumber: 0,
+      pg: null,
+      instance: mockInstance,
       tx,
       mysql: mockMysql
     });
diff --git a/apps/api/tsconfig.json b/apps/api/tsconfig.json
index 08adb5860..d2d3ce1f7 100644
--- a/apps/api/tsconfig.json
+++ b/apps/api/tsconfig.json
@@ -1,14 +1,10 @@
 {
+  "extends": "../../tsconfig.json",
   "compilerOptions": {
     "target": "esnext",
     "module": "commonjs",
-    "rootDir": "./",
-    "outDir": "./dist",
-    "esModuleInterop": true,
-    "strict": true,
-    "noImplicitAny": false,
-    "resolveJsonModule": true,
     "moduleResolution": "Node",
-    "skipLibCheck": true
+    "rootDir": "./",
+    "outDir": "./dist"
   }
 }