diff --git a/client/src/client-only-routes/show-project-links.tsx b/client/src/client-only-routes/show-project-links.tsx
index b927bf8c0c..7139917541 100644
--- a/client/src/client-only-routes/show-project-links.tsx
+++ b/client/src/client-only-routes/show-project-links.tsx
@@ -116,14 +116,10 @@ const ShowProjectLinks = (props: ShowProjectLinksProps): JSX.Element => {
         { title: 'Data Visualization' },
         { title: 'Back End Development and APIs' },
         { title: 'Legacy Information Security and Quality Assurance' }
-      ];
+      ] as const;
       return legacyCerts.map((cert, ind) => {
-        /* eslint-disable @typescript-eslint/no-unsafe-assignment */
-        /* eslint-disable @typescript-eslint/no-unsafe-call */
-        /* eslint-disable @typescript-eslint/no-unsafe-return */
-        /* eslint-disable @typescript-eslint/no-unsafe-member-access */
-        // @ts-expect-error Error expected until projectMap is typed
-        const mapToUse = projectMap[cert.title] || legacyProjectMap[cert.title];
+        const mapToUse = (projectMap[cert.title] ||
+          legacyProjectMap[cert.title]) as { certSlug: string }[];
         const { certSlug } = first(mapToUse) as { certSlug: string };
         const certLocation = `/certification/${username}/${certSlug}`;
         return (
@@ -141,17 +137,19 @@ const ShowProjectLinks = (props: ShowProjectLinksProps): JSX.Element => {
       });
     }
     // @ts-expect-error Error expected until projectMap is typed
-    return (projectMap[certName] || legacyProjectMap[certName]).map(
-      // @ts-expect-error Error expected until projectMap is typed
-      ({ link, title, id }) => (
-        <li key={id}>
-          <Link className='project-link' to={link}>
-            {t(`certification.project.title.${title as string}`, title)}
-          </Link>
-          : {getProjectSolution(id, title)}
-        </li>
-      )
-    );
+    const project = (projectMap[certName] || legacyProjectMap[certName]) as {
+      link: string;
+      title: string;
+      id: string;
+    }[];
+    return project.map(({ link, title, id }) => (
+      <li key={id}>
+        <Link className='project-link' to={link}>
+          {t(`certification.project.title.${title}`, title)}
+        </Link>
+        : {getProjectSolution(id, title)}
+      </li>
+    ));
     /* eslint-enable @typescript-eslint/no-unsafe-assignment */
     /* eslint-enable @typescript-eslint/no-unsafe-call */
     /* eslint-enable @typescript-eslint/no-unsafe-return */
diff --git a/client/src/components/formHelpers/form-fields.tsx b/client/src/components/formHelpers/form-fields.tsx
index 32b3e5ca29..4b43881894 100644
--- a/client/src/components/formHelpers/form-fields.tsx
+++ b/client/src/components/formHelpers/form-fields.tsx
@@ -101,7 +101,12 @@ function FormFields(props: FormFieldsProps): JSX.Element {
                       type={type}
                       value={value as string}
                     />
-                    {nullOrWarning(value, !pristine && error, isURL, name)}
+                    {nullOrWarning(
+                      value as string,
+                      !pristine && error,
+                      isURL,
+                      name
+                    )}
                   </FormGroup>
                 </Col>
               );
diff --git a/client/src/components/profile/components/heat-map.tsx b/client/src/components/profile/components/heat-map.tsx
index 382c545927..858d089ec5 100644
--- a/client/src/components/profile/components/heat-map.tsx
+++ b/client/src/components/profile/components/heat-map.tsx
@@ -17,6 +17,7 @@ import './heatmap.css';
 // @ts-ignore
 import envData from '../../../../../config/env.json';
 import { langCodes } from '../../../../../config/i18n/all-langs';
+import { User } from '../../../redux/prop-types';
 import FullWidthRow from '../../helpers/full-width-row';
 import Spacer from '../../helpers/spacer';
 
@@ -29,8 +30,7 @@ const { clientLocale } = envData;
 const localeCode = langCodes[clientLocale];
 
 interface HeatMapProps {
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  calendar: any;
+  calendar: User['calendar'];
 }
 
 interface PageData {
@@ -186,7 +186,6 @@ class HeatMapInner extends Component<HeatMapInnerProps, HeatMapInnerState> {
 
 const HeatMap = (props: HeatMapProps): JSX.Element => {
   const { t } = useTranslation();
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
   const { calendar } = props;
 
   /**
@@ -195,8 +194,9 @@ const HeatMap = (props: HeatMapProps): JSX.Element => {
    */
 
   // create array of timestamps and turn into milliseconds
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  const timestamps = Object.keys(calendar).map((stamp: any) => stamp * 1000);
+  const timestamps = Object.keys(calendar).map(
+    stamp => Number.parseInt(stamp, 10) * 1000
+  );
   const startOfTimestamps = startOfDay(new Date(timestamps[0]));
   let endOfCalendar = startOfDay(Date.now());
   let startOfCalendar;
diff --git a/client/src/components/search/searchBar/search-hits.tsx b/client/src/components/search/searchBar/search-hits.tsx
index 56854e52d6..3ed927d6db 100644
--- a/client/src/components/search/searchBar/search-hits.tsx
+++ b/client/src/components/search/searchBar/search-hits.tsx
@@ -57,6 +57,7 @@ const CustomHits = connectHits(
     ];
     const allHits = hits.slice(0, 8).concat(footer);
     useEffect(() => {
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
       handleHits(allHits);
     });
 
diff --git a/client/src/redux/prop-types.ts b/client/src/redux/prop-types.ts
index e2ca341838..e6a46dfb7d 100644
--- a/client/src/redux/prop-types.ts
+++ b/client/src/redux/prop-types.ts
@@ -220,7 +220,7 @@ export type CertTest = {
 };
 
 export type User = {
-  calendar: unknown;
+  calendar: Record<string, number>;
   about: string;
   acceptedPrivacyTerms: boolean;
   completedChallenges: CompletedChallenge[];
diff --git a/client/src/templates/Challenges/classic/desktop-layout.tsx b/client/src/templates/Challenges/classic/desktop-layout.tsx
index b8112ec351..a303c1f86c 100644
--- a/client/src/templates/Challenges/classic/desktop-layout.tsx
+++ b/client/src/templates/Challenges/classic/desktop-layout.tsx
@@ -64,7 +64,7 @@ const DesktopLayout = (props: DesktopLayoutProps): JSX.Element => {
 
   const getChallengeFile = () => {
     const { challengeFiles } = props;
-    return first(sortChallengeFiles(challengeFiles)) as ChallengeFile | null;
+    return first(sortChallengeFiles(challengeFiles) as ChallengeFile[]);
   };
 
   const {
diff --git a/client/src/templates/Challenges/components/completion-modal-body.tsx b/client/src/templates/Challenges/components/completion-modal-body.tsx
index 7352263609..3b943a4613 100644
--- a/client/src/templates/Challenges/components/completion-modal-body.tsx
+++ b/client/src/templates/Challenges/components/completion-modal-body.tsx
@@ -13,7 +13,7 @@ interface CompletionModalBodyProps {
 interface CompletionModalBodyState {
   // This type was driving me nuts - seems like `NodeJS.Timeout | null;` should work
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  progressInterval: any;
+  progressInterval: number | null;
   shownPercent: number;
 }
 
@@ -45,7 +45,7 @@ export class CompletionModalBody extends PureComponent<
     const amountPerInterval = completedPercent / intervalsToFinish;
     let percent = 0;
 
-    const myInterval = setInterval(() => {
+    const myInterval = window.setInterval(() => {
       percent += amountPerInterval;
 
       if (percent > completedPercent) percent = completedPercent;
@@ -65,7 +65,8 @@ export class CompletionModalBody extends PureComponent<
   }
 
   componentWillUnmount(): void {
-    clearInterval(this.state.progressInterval);
+    if (this.state.progressInterval !== null)
+      clearInterval(this.state.progressInterval);
   }
 
   render(): JSX.Element {
diff --git a/tools/challenge-helper-scripts/create-project.ts b/tools/challenge-helper-scripts/create-project.ts
index 0eb484f5e2..2e7a9059e5 100644
--- a/tools/challenge-helper-scripts/create-project.ts
+++ b/tools/challenge-helper-scripts/create-project.ts
@@ -35,6 +35,14 @@ type Meta = {
   challengeOrder: string[][];
 };
 
+interface CreateProjectArgs {
+  superBlock: SuperBlocks;
+  block: string;
+  helpCategory: string;
+  order: number;
+  title?: string;
+}
+
 async function createProject(
   superBlock: SuperBlocks,
   block: string,
@@ -264,8 +272,9 @@ prompt([
     }
   }
 ])
-  .then(({ superBlock, block, title, helpCategory, order }) =>
-    createProject(superBlock, block, helpCategory, order, title)
+  .then(
+    ({ superBlock, block, title, helpCategory, order }: CreateProjectArgs) =>
+      createProject(superBlock, block, helpCategory, order, title)
   )
   .then(() =>
     console.log(
diff --git a/tools/scripts/build/ensure-env.ts b/tools/scripts/build/ensure-env.ts
index 7ad84643de..6da64c1610 100644
--- a/tools/scripts/build/ensure-env.ts
+++ b/tools/scripts/build/ensure-env.ts
@@ -59,7 +59,7 @@ if (FREECODECAMP_NODE_ENV !== 'development') {
     searchKeys,
     donationKeys
   );
-  const receivedvariables = Object.keys(env);
+  const receivedvariables = Object.keys(env as Record<string, unknown>);
   expectedVariables.sort();
   receivedvariables.sort();
   if (expectedVariables.length !== receivedvariables.length) {