diff --git a/torchci/lib/clickhouse.ts b/torchci/lib/clickhouse.ts
index 4edf7366d4..07a1daff0f 100644
--- a/torchci/lib/clickhouse.ts
+++ b/torchci/lib/clickhouse.ts
@@ -32,7 +32,7 @@ export async function queryClickhouse(
   params: Record<string, unknown>,
   query_id?: string,
   useQueryCache?: boolean
-): Promise<any[]> {
+): Promise<{ [key: string]: any }[]> {
   if (query_id === undefined) {
     query_id = "adhoc";
   }
@@ -61,23 +61,26 @@ export async function queryClickhouse(
   return (await res.json()) as any[];
 }
 
+/**
+ * Returns the result of a query from the clickhouse database.
+ *
+ * The format is an array of json dictionaries/objects ex [{name: "foo", age: 42}, {name: "bar", age: 43}]
+ *
+ * @param queryName: string, the name of the query, which is the name of the folder in clickhouse_queries
+ * @param inputParams: Record<string, unknown>, the parameters to the query, an object where keys are the parameter names
+ * @param useQueryCache: boolean, if true, cache the query result on Ch side (1 minute TTL)
+ *
+ * This function will filter the inputParams to only include the parameters
+ * that are in the query params json file.
+ *
+ * During local development, if this fails due to "cannot find module ...
+ * params.json", delete the .next folder and try again.
+ */
 export async function queryClickhouseSaved(
   queryName: string,
   inputParams: Record<string, unknown>,
   useQueryCache?: boolean
 ) {
-  /**
-   * queryClickhouseSaved
-   * @param queryName: string, the name of the query, which is the name of the folder in clickhouse_queries
-   * @param inputParams: Record<string, unknown>, the parameters to the query, an object where keys are the parameter names
-   * @param useQueryCache: boolean, if true, cache the query result on Ch side (1 minute TTL)
-   *
-   * This function will filter the inputParams to only include the parameters
-   * that are in the query params json file.
-   *
-   * During local development, if this fails due to "cannot find module ...
-   * params.json", delete the .next folder and try again.
-   */
   const query = readFileSync(
     // https://stackoverflow.com/questions/74924100/vercel-error-enoent-no-such-file-or-directory
     `${process.cwd()}/clickhouse_queries/${queryName}/query.sql`,
diff --git a/torchci/lib/drciUtils.ts b/torchci/lib/drciUtils.ts
index 2827b36feb..2e23927b28 100644
--- a/torchci/lib/drciUtils.ts
+++ b/torchci/lib/drciUtils.ts
@@ -510,12 +510,11 @@ export async function getPRMergeCommits(
   });
 
   // If the array is empty, the PR hasn't been merged yet
-  return results.reduce((acc: { [prNumber: number]: string[] }, row: any) => {
-    if (!acc[row.pr_num]) {
-      acc[row.pr_num] = [];
+  return results.reduce((acc: Map<number, string[]>, row: any) => {
+    if (!acc.has(row.pr_num)) {
+      acc.set(row.pr_num, []);
     }
-
-    acc[row.pr_num].push(row.merge_commit_sha);
+    acc.get(row.pr_num)!.push(row.merge_commit_sha);
     return acc;
   }, new Map<number, string[]>());
 }
diff --git a/torchci/lib/fetchDisabledNonFlakyTests.ts b/torchci/lib/fetchDisabledNonFlakyTests.ts
index 2c11df1ecd..f8b292c7f5 100644
--- a/torchci/lib/fetchDisabledNonFlakyTests.ts
+++ b/torchci/lib/fetchDisabledNonFlakyTests.ts
@@ -4,8 +4,8 @@ import { DisabledNonFlakyTestData } from "./types";
 export default async function fetchDisabledNonFlakyTests(): Promise<
   DisabledNonFlakyTestData[]
 > {
-  return await queryClickhouseSaved("flaky_tests/disabled_non_flaky_tests", {
+  return (await queryClickhouseSaved("flaky_tests/disabled_non_flaky_tests", {
     max_num_red: 0,
     min_num_green: 150,
-  });
+  })) as DisabledNonFlakyTestData[];
 }
diff --git a/torchci/lib/fetchFlakyTests.ts b/torchci/lib/fetchFlakyTests.ts
index 6433a2aab8..0aaf15e24f 100644
--- a/torchci/lib/fetchFlakyTests.ts
+++ b/torchci/lib/fetchFlakyTests.ts
@@ -12,7 +12,7 @@ export default async function fetchFlakyTests(
     name: testName,
     suite: testSuite,
     file: testFile,
-  });
+  }) as any;
 }
 
 export async function fetchFlakyTestsAcrossJobs(): Promise<FlakyTestData[]> {
@@ -77,7 +77,7 @@ export async function fetchFlakyTestsAcrossFileReruns(
       if (!workflowJobMap.has(curr.job_id)) {
         return accum;
       }
-      const job_info = workflowJobMap.get(curr.job_id);
+      const job_info = workflowJobMap.get(curr.job_id)!;
       if (val === undefined) {
         accum.set(key, {
           file: curr.file,
diff --git a/torchci/lib/fetchIssuesByLabel.ts b/torchci/lib/fetchIssuesByLabel.ts
index fbd2ff7700..6d501fe931 100644
--- a/torchci/lib/fetchIssuesByLabel.ts
+++ b/torchci/lib/fetchIssuesByLabel.ts
@@ -5,11 +5,11 @@ export default async function fetchIssuesByLabel(
   label: string,
   useChCache?: boolean
 ): Promise<IssueData[]> {
-  return await queryClickhouseSaved(
+  return (await queryClickhouseSaved(
     "issue_query",
     {
       label,
     },
     useChCache
-  );
+  )) as IssueData[];
 }
diff --git a/torchci/lib/fetchRecentWorkflows.ts b/torchci/lib/fetchRecentWorkflows.ts
index e29bc994e1..bfb2edce7a 100644
--- a/torchci/lib/fetchRecentWorkflows.ts
+++ b/torchci/lib/fetchRecentWorkflows.ts
@@ -6,17 +6,17 @@ export async function fetchRecentWorkflows(
   prNumbers: Array<number> = [],
   numMinutes: string = "30"
 ): Promise<RecentWorkflowsData[]> {
-  return await queryClickhouseSaved("recent_pr_workflows_query", {
+  return (await queryClickhouseSaved("recent_pr_workflows_query", {
     numMinutes,
     prNumbers,
     repo,
-  });
+  })) as RecentWorkflowsData[];
 }
 
 export async function fetchFailedJobsFromCommits(
   shas: string[]
 ): Promise<RecentWorkflowsData[]> {
-  return await queryClickhouseSaved("commit_failed_jobs", {
+  return (await queryClickhouseSaved("commit_failed_jobs", {
     shas,
-  });
+  })) as RecentWorkflowsData[];
 }
diff --git a/torchci/lib/getAuthors.ts b/torchci/lib/getAuthors.ts
index a472650455..3796ee56af 100644
--- a/torchci/lib/getAuthors.ts
+++ b/torchci/lib/getAuthors.ts
@@ -36,5 +36,11 @@ where
     shas: _.map(jobs, (job: RecentWorkflowsData) => job.head_sha),
   });
 
-  return _.keyBy(results, (record) => record.sha);
+  return _.keyBy(results, (record) => record.sha) as {
+    [key: string]: {
+      email: string;
+      commit_username: string;
+      pr_username: string;
+    };
+  };
 }
diff --git a/torchci/lib/utilization/fetchListUtilizationMetadataInfo.ts b/torchci/lib/utilization/fetchListUtilizationMetadataInfo.ts
index 39748556f9..25479cd719 100644
--- a/torchci/lib/utilization/fetchListUtilizationMetadataInfo.ts
+++ b/torchci/lib/utilization/fetchListUtilizationMetadataInfo.ts
@@ -34,14 +34,14 @@ export default async function fetchListUtilizationMetadataInfo(
   return {
     workflow_id: params.workflow_id,
     workflow_name: meta_resp[0].workflow_name,
-    metadata_list: meta_resp ? meta_resp : ([] as UtilizationMetadataInfo[]),
+    metadata_list: meta_resp ? meta_resp : [],
   };
 }
 
 async function listUtilizationMetadataInfo(
   workflow_id: string,
   repo: string = UTILIZATION_DEFAULT_REPO
-) {
+): Promise<UtilizationMetadataInfo[]> {
   const response = await queryClickhouseSaved(
     LIST_UTIL_METADATA_INFO_QUERY_FOLDER_NAME,
     {
@@ -49,7 +49,7 @@ async function listUtilizationMetadataInfo(
       repo: repo,
     }
   );
-  return response;
+  return response as UtilizationMetadataInfo[];
 }
 
 async function listUtilizationMetadataWithStats(
diff --git a/torchci/lib/utilization/fetchUtilization.ts b/torchci/lib/utilization/fetchUtilization.ts
index 01db0e934c..567c8f485f 100644
--- a/torchci/lib/utilization/fetchUtilization.ts
+++ b/torchci/lib/utilization/fetchUtilization.ts
@@ -81,7 +81,7 @@ async function getUtilizationMetadata(
   job_id: string,
   run_attempt: string,
   repo: string = UTILIZATION_DEFAULT_REPO
-) {
+): Promise<UtilizationMetadata[]> {
   const response = await queryClickhouseSaved(UTIL_METADATA_QUERY_FOLDER_NAME, {
     workflowId: workflow_id,
     jobId: job_id,
@@ -89,7 +89,7 @@ async function getUtilizationMetadata(
     type: UTILIZATION_TYPE,
     repo: repo,
   });
-  return response;
+  return response as UtilizationMetadata[];
 }
 
 function getDisplayName(name: string) {
diff --git a/torchci/pages/api/flaky-tests/3dStats.ts b/torchci/pages/api/flaky-tests/3dStats.ts
index 2bf2ea6e68..8d8bddc53f 100644
--- a/torchci/pages/api/flaky-tests/3dStats.ts
+++ b/torchci/pages/api/flaky-tests/3dStats.ts
@@ -31,7 +31,7 @@ async function getTest(
   for (const row of res) {
     row.conclusions = _.countBy(row.conclusions);
   }
-  return res;
+  return res as TestInfoAPIResponse;
 }
 
 export type TestInfoAPIResponse = {
diff --git a/torchci/pages/api/flaky-tests/search.ts b/torchci/pages/api/flaky-tests/search.ts
index 42cea6781e..9b97af2089 100644
--- a/torchci/pages/api/flaky-tests/search.ts
+++ b/torchci/pages/api/flaky-tests/search.ts
@@ -37,7 +37,7 @@ async function listTests(
 
   return {
     count: (await count)[0].count,
-    tests: await result,
+    tests: (await result) as any,
   };
 }