diff --git a/client/src/pages/404.js b/client/src/pages/404.tsx
similarity index 62%
rename from client/src/pages/404.js
rename to client/src/pages/404.tsx
index d804c3a98ad..95ff28fefef 100644
--- a/client/src/pages/404.js
+++ b/client/src/pages/404.tsx
@@ -7,10 +7,15 @@ import FourOhFour from '../components/FourOhFour';
 import ShowProfileOrFourOhFour from '../client-only-routes/show-profile-or-four-oh-four';
 /* eslint-enable max-len */
 
-function FourOhFourPage() {
+function FourOhFourPage(): JSX.Element {
   return (
     <Router>
+      {/* Error from installing @types/react-helmet and @types/react-redux */}
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <ShowProfileOrFourOhFour path={withPrefix('/:maybeUser')} />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <FourOhFour default={true} />
     </Router>
   );
diff --git a/client/src/pages/certification.js b/client/src/pages/certification.js
deleted file mode 100644
index 1cfbf093710..00000000000
--- a/client/src/pages/certification.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import React, { Component } from 'react';
-import { Router } from '@reach/router';
-import { withPrefix } from 'gatsby';
-
-import RedirectHome from '../components/RedirectHome';
-import ShowCertification from '../client-only-routes/show-certification';
-
-import './certification.css';
-
-class Certification extends Component {
-  render() {
-    return (
-      <Router>
-        <ShowCertification
-          path={withPrefix('/certification/:username/:certSlug')}
-        />
-        <RedirectHome default={true} />
-      </Router>
-    );
-  }
-}
-
-export default Certification;
diff --git a/client/src/pages/certification.tsx b/client/src/pages/certification.tsx
new file mode 100644
index 00000000000..d357566327a
--- /dev/null
+++ b/client/src/pages/certification.tsx
@@ -0,0 +1,26 @@
+import React from 'react';
+import { Router } from '@reach/router';
+import { withPrefix } from 'gatsby';
+
+import RedirectHome from '../components/RedirectHome';
+import ShowCertification from '../client-only-routes/show-certification';
+
+import './certification.css';
+
+function Certification(): JSX.Element {
+  return (
+    <Router>
+      <ShowCertification
+        // Error from installing @types/react-helmet and @types/react-redux
+        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+        // @ts-ignore
+        path={withPrefix('/certification/:username/:certSlug')}
+      />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
+      <RedirectHome default={true} />
+    </Router>
+  );
+}
+
+export default Certification;
diff --git a/client/src/pages/challenges.js b/client/src/pages/challenges.js
deleted file mode 100644
index 0d263bdb344..00000000000
--- a/client/src/pages/challenges.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// this exists purely to redirect legacy challenge paths to /learn
-import React from 'react';
-import { Router } from '@reach/router';
-import { navigate, withPrefix } from 'gatsby';
-
-import toLearnPath from '../utils/to-learn-path';
-
-const Redirect = props => {
-  if (typeof window !== 'undefined') {
-    navigate(toLearnPath(props));
-  }
-  return null;
-};
-
-const Challenges = () => (
-  <Router basepath={withPrefix('/challenges')}>
-    <Redirect path='/:superBlock/' />
-    <Redirect path='/:superBlock/:block/' />
-    <Redirect path='/:superBlock/:block/:challenge' />
-    <Redirect default={true} />
-  </Router>
-);
-
-Challenges.displayName = 'Challenges';
-
-export default Challenges;
diff --git a/client/src/pages/challenges.test.js b/client/src/pages/challenges.test.ts
similarity index 100%
rename from client/src/pages/challenges.test.js
rename to client/src/pages/challenges.test.ts
diff --git a/client/src/pages/challenges.tsx b/client/src/pages/challenges.tsx
new file mode 100644
index 00000000000..b85e576c656
--- /dev/null
+++ b/client/src/pages/challenges.tsx
@@ -0,0 +1,44 @@
+// this exists purely to redirect legacy challenge paths to /learn
+import React from 'react';
+import { Router } from '@reach/router';
+import { navigate, withPrefix } from 'gatsby';
+
+import toLearnPath from '../utils/to-learn-path';
+
+// interface RedirectProps1 {
+//   superBlock: string;
+//   block: string;
+//   challenge: string;
+// }
+
+// interface RedirectProps2 {
+//   path?: string;
+//   default?: boolean;
+// }
+
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
+function Redirect(props) {
+  if (typeof window !== 'undefined') {
+    void navigate(toLearnPath(props));
+  }
+  return null;
+}
+// Unsure about Redirect props shape:
+// toLearnPath() takes required superBlock, block, and challenge props
+// but usage below has optional path and default props
+
+function Challenges(): JSX.Element {
+  return (
+    <Router basepath={withPrefix('/challenges')}>
+      <Redirect path='/:superBlock/' />
+      <Redirect path='/:superBlock/:block/' />
+      <Redirect path='/:superBlock/:block/:challenge' />
+      <Redirect default={true} />
+    </Router>
+  );
+}
+
+Challenges.displayName = 'Challenges';
+
+export default Challenges;
diff --git a/client/src/pages/donate.js b/client/src/pages/donate.js
deleted file mode 100644
index 2263d22fe3b..00000000000
--- a/client/src/pages/donate.js
+++ /dev/null
@@ -1,140 +0,0 @@
-import React, { Component, Fragment } from 'react';
-import Helmet from 'react-helmet';
-import PropTypes from 'prop-types';
-import { bindActionCreators } from 'redux';
-import { connect } from 'react-redux';
-import { createSelector } from 'reselect';
-import { Grid, Row, Col, Alert } from '@freecodecamp/react-bootstrap';
-import { withTranslation } from 'react-i18next';
-
-import { Spacer, Loader } from '../components/helpers';
-import DonateForm from '../components/Donation/DonateForm';
-import {
-  DonationText,
-  DonationSupportText,
-  DonationOptionsText,
-  DonationOptionsAlertText
-} from '../components/Donation/DonationTextComponents';
-import { signInLoadingSelector, userSelector, executeGA } from '../redux';
-import CampersImage from '../components/landing/components/CampersImage';
-
-const propTypes = {
-  executeGA: PropTypes.func,
-  isDonating: PropTypes.bool,
-  showLoading: PropTypes.bool.isRequired,
-  t: PropTypes.func.isRequired
-};
-
-const mapStateToProps = createSelector(
-  userSelector,
-  signInLoadingSelector,
-  ({ isDonating }, showLoading) => ({
-    isDonating,
-    showLoading
-  })
-);
-
-const mapDispatchToProps = dispatch =>
-  bindActionCreators(
-    {
-      executeGA
-    },
-    dispatch
-  );
-
-class DonatePage extends Component {
-  constructor(...props) {
-    super(...props);
-    this.state = {
-      enableSettings: false
-    };
-    this.handleProcessing = this.handleProcessing.bind(this);
-  }
-
-  componentDidMount() {
-    this.props.executeGA({
-      type: 'event',
-      data: {
-        category: 'Donation View',
-        action: `Displayed donate page`,
-        nonInteraction: true
-      }
-    });
-  }
-
-  handleProcessing(duration, amount, action) {
-    this.props.executeGA({
-      type: 'event',
-      data: {
-        category: 'Donation',
-        action: `donate page ${action}`,
-        label: duration,
-        value: amount
-      }
-    });
-  }
-
-  render() {
-    const { showLoading, isDonating, t } = this.props;
-
-    if (showLoading) {
-      return <Loader fullScreen={true} />;
-    }
-
-    return (
-      <Fragment>
-        <Helmet title={`${t('donate.title')} | freeCodeCamp.org`} />
-        <Grid className='donate-page-wrapper'>
-          <Spacer />
-          <Row>
-            <Fragment>
-              <Col lg={6} lgOffset={0} md={8} mdOffset={2} sm={10} smOffset={1}>
-                <Row>
-                  <Col className={'text-center'} xs={12}>
-                    {isDonating ? (
-                      <h2>{t('donate.thank-you')}</h2>
-                    ) : (
-                      <h2>{t('donate.help-more')}</h2>
-                    )}
-                    <Spacer />
-                  </Col>
-                </Row>
-                {isDonating ? (
-                  <Alert>
-                    <p>{t('donate.thank-you-2')}</p>
-                    <br />
-                    <DonationOptionsAlertText />
-                  </Alert>
-                ) : null}
-                <DonationText />
-                <DonateForm
-                  enableDonationSettingsPage={this.enableDonationSettingsPage}
-                  handleProcessing={this.handleProcessing}
-                />
-                <Row className='donate-support'>
-                  <Col xs={12}>
-                    <hr />
-                    <DonationOptionsText />
-                    <DonationSupportText />
-                  </Col>
-                </Row>
-              </Col>
-              <Col lg={6}>
-                <CampersImage page='donate' />
-              </Col>
-            </Fragment>
-          </Row>
-          <Spacer />
-        </Grid>
-      </Fragment>
-    );
-  }
-}
-
-DonatePage.displayName = 'DonatePage';
-DonatePage.propTypes = propTypes;
-
-export default connect(
-  mapStateToProps,
-  mapDispatchToProps
-)(withTranslation()(DonatePage));
diff --git a/client/src/pages/donate.tsx b/client/src/pages/donate.tsx
new file mode 100644
index 00000000000..ffb1b367c23
--- /dev/null
+++ b/client/src/pages/donate.tsx
@@ -0,0 +1,142 @@
+import React, { useEffect } from 'react';
+import Helmet from 'react-helmet';
+import { bindActionCreators } from 'redux';
+import type { Dispatch } from 'redux';
+import { connect } from 'react-redux';
+import { createSelector } from 'reselect';
+import { Grid, Row, Col, Alert } from '@freecodecamp/react-bootstrap';
+import { withTranslation } from 'react-i18next';
+
+import { Spacer, Loader } from '../components/helpers';
+import DonateForm from '../components/Donation/DonateForm';
+import {
+  DonationText,
+  DonationSupportText,
+  DonationOptionsText,
+  DonationOptionsAlertText
+} from '../components/Donation/DonationTextComponents';
+import { signInLoadingSelector, userSelector, executeGA } from '../redux';
+import CampersImage from '../components/landing/components/CampersImage';
+
+interface ExecuteGaArg {
+  type: string;
+  data: {
+    category: string;
+    action: string;
+    nonInteraction?: boolean;
+    label?: string;
+    value?: number;
+  };
+}
+interface DonatePageProps {
+  executeGA: (arg: ExecuteGaArg) => void;
+  isDonating?: boolean;
+  showLoading: boolean;
+  t: (s: string) => string;
+}
+
+const mapStateToProps = createSelector(
+  userSelector,
+  signInLoadingSelector,
+  ({ isDonating }: { isDonating: boolean }, showLoading: boolean) => ({
+    isDonating,
+    showLoading
+  })
+);
+
+const mapDispatchToProps = (dispatch: Dispatch) =>
+  bindActionCreators({ executeGA }, dispatch);
+
+function DonatePage({
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  executeGA = () => {},
+  isDonating = false,
+  showLoading,
+  t
+}: DonatePageProps) {
+  useEffect(() => {
+    executeGA({
+      type: 'event',
+      data: {
+        category: 'Donation View',
+        action: `Displayed donate page`,
+        nonInteraction: true
+      }
+    });
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  function handleProcessing(duration: string, amount: number, action: string) {
+    executeGA({
+      type: 'event',
+      data: {
+        category: 'Donation',
+        action: `donate page ${action}`,
+        label: duration,
+        value: amount
+      }
+    });
+  }
+
+  return showLoading ? (
+    <Loader fullScreen={true} />
+  ) : (
+    <>
+      <Helmet title={`${t('donate.title')} | freeCodeCamp.org`} />
+      <Grid className='donate-page-wrapper'>
+        {/* 'Spacer' cannot be used as a JSX component. */}
+        {/* Its return type 'Element | Element[]' is not a valid JSX element. */}
+        {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+        {/* @ts-ignore */}
+        <Spacer />
+        <Row>
+          <>
+            <Col lg={6} lgOffset={0} md={8} mdOffset={2} sm={10} smOffset={1}>
+              <Row>
+                <Col className={'text-center'} xs={12}>
+                  {isDonating ? (
+                    <h2>{t('donate.thank-you')}</h2>
+                  ) : (
+                    <h2>{t('donate.help-more')}</h2>
+                  )}
+                  {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+                  {/* @ts-ignore */}
+                  <Spacer />
+                </Col>
+              </Row>
+              {isDonating ? (
+                <Alert>
+                  <p>{t('donate.thank-you-2')}</p>
+                  <br />
+                  <DonationOptionsAlertText />
+                </Alert>
+              ) : null}
+              <DonationText />
+              <DonateForm handleProcessing={handleProcessing} />
+              <Row className='donate-support'>
+                <Col xs={12}>
+                  <hr />
+                  <DonationOptionsText />
+                  <DonationSupportText />
+                </Col>
+              </Row>
+            </Col>
+            <Col lg={6}>
+              <CampersImage page='donate' />
+            </Col>
+          </>
+        </Row>
+        {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+        {/* @ts-ignore */}
+        <Spacer />
+      </Grid>
+    </>
+  );
+}
+
+DonatePage.displayName = 'DonatePage';
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(withTranslation()(DonatePage));
diff --git a/client/src/pages/email-sign-up.js b/client/src/pages/email-sign-up.js
deleted file mode 100644
index 0fb0041ab68..00000000000
--- a/client/src/pages/email-sign-up.js
+++ /dev/null
@@ -1,114 +0,0 @@
-import React, { Component, Fragment } from 'react';
-import PropTypes from 'prop-types';
-import { bindActionCreators } from 'redux';
-import { connect } from 'react-redux';
-import SectionHeader from '../components/settings/SectionHeader';
-import IntroDescription from '../components/Intro/components/IntroDescription';
-import { withTranslation } from 'react-i18next';
-
-import { Row, Col, Button, Grid } from '@freecodecamp/react-bootstrap';
-import Helmet from 'react-helmet';
-import { createSelector } from 'reselect';
-
-import { ButtonSpacer, Spacer } from '../components/helpers';
-import { acceptTerms, userSelector } from '../redux';
-import createRedirect from '../components/createRedirect';
-
-import './email-sign-up.css';
-
-const propTypes = {
-  acceptTerms: PropTypes.func.isRequired,
-  acceptedPrivacyTerms: PropTypes.bool,
-  isSignedIn: PropTypes.bool,
-  t: PropTypes.func.isRequired
-};
-
-const mapStateToProps = createSelector(
-  userSelector,
-  ({ acceptedPrivacyTerms }) => ({
-    acceptedPrivacyTerms
-  })
-);
-const mapDispatchToProps = dispatch =>
-  bindActionCreators({ acceptTerms }, dispatch);
-const RedirectToLearn = createRedirect('/learn');
-
-class AcceptPrivacyTerms extends Component {
-  componentWillUnmount() {
-    // if a user navigates away from here we should set acceptedPrivacyTerms
-    // to true (so they do not get pulled back) without changing their email
-    // preferences (hence the null payload)
-    // This ensures the user has to click the checkbox and then click the
-    // 'Continue...' button to sign up.
-    if (!this.props.acceptedPrivacyTerms) {
-      this.props.acceptTerms(null);
-    }
-  }
-
-  onClick(isWeeklyEmailAccepted) {
-    this.props.acceptTerms(isWeeklyEmailAccepted);
-  }
-
-  render() {
-    const { acceptedPrivacyTerms, t } = this.props;
-    if (acceptedPrivacyTerms) {
-      return <RedirectToLearn />;
-    }
-
-    return (
-      <Fragment>
-        <Helmet>
-          <title>{t('misc.email-signup')} | freeCodeCamp.org</title>
-        </Helmet>
-        <Grid className='default-page-wrapper email-sign-up'>
-          <Spacer />
-          <SectionHeader>{t('misc.email-signup')}</SectionHeader>
-          <Row>
-            <Col md={8} mdOffset={2} sm={10} smOffset={1} xs={12}>
-              <IntroDescription />
-              <strong>{t('misc.quincy')}</strong>
-              <Spacer />
-              <p>{t('misc.email-blast')}</p>
-              <Spacer />
-            </Col>
-
-            <Col md={4} mdOffset={2} sm={5} smOffset={1} xs={12}>
-              <Button
-                block={true}
-                bsSize='lg'
-                bsStyle='primary'
-                className='big-cta-btn'
-                onClick={() => this.onClick(true)}
-              >
-                {t('buttons.yes-please')}
-              </Button>
-              <ButtonSpacer />
-            </Col>
-            <Col md={4} sm={5} xs={12}>
-              <Button
-                block={true}
-                bsSize='lg'
-                bsStyle='primary'
-                className='big-cta-btn'
-                onClick={() => this.onClick(false)}
-              >
-                {t('buttons.no-thanks')}
-              </Button>
-              <ButtonSpacer />
-            </Col>
-            <Col xs={12}>
-              <Spacer />
-            </Col>
-          </Row>
-        </Grid>
-      </Fragment>
-    );
-  }
-}
-
-AcceptPrivacyTerms.propTypes = propTypes;
-
-export default connect(
-  mapStateToProps,
-  mapDispatchToProps
-)(withTranslation()(AcceptPrivacyTerms));
diff --git a/client/src/pages/email-sign-up.tsx b/client/src/pages/email-sign-up.tsx
new file mode 100644
index 00000000000..3cb2a76166c
--- /dev/null
+++ b/client/src/pages/email-sign-up.tsx
@@ -0,0 +1,117 @@
+import React, { useEffect } from 'react';
+import { bindActionCreators } from 'redux';
+import type { Dispatch } from 'redux';
+import { connect } from 'react-redux';
+import SectionHeader from '../components/settings/SectionHeader';
+import IntroDescription from '../components/Intro/components/IntroDescription';
+import { withTranslation } from 'react-i18next';
+
+import { Row, Col, Button, Grid } from '@freecodecamp/react-bootstrap';
+import Helmet from 'react-helmet';
+import { createSelector } from 'reselect';
+
+import { ButtonSpacer, Spacer } from '../components/helpers';
+import { acceptTerms, userSelector } from '../redux';
+import createRedirect from '../components/createRedirect';
+
+import './email-sign-up.css';
+
+interface AcceptPrivacyTermsProps {
+  acceptTerms: (accept: boolean | null) => void;
+  acceptedPrivacyTerms: boolean;
+  t: (s: string) => string;
+}
+
+const mapStateToProps = createSelector(
+  userSelector,
+  ({ acceptedPrivacyTerms }: { acceptedPrivacyTerms: boolean }) => ({
+    acceptedPrivacyTerms
+  })
+);
+const mapDispatchToProps = (dispatch: Dispatch) =>
+  bindActionCreators({ acceptTerms }, dispatch);
+const RedirectToLearn = createRedirect('/learn');
+
+function AcceptPrivacyTerms({
+  acceptTerms,
+  acceptedPrivacyTerms,
+  t
+}: AcceptPrivacyTermsProps) {
+  // if a user navigates away from here we should set acceptedPrivacyTerms
+  // to true (so they do not get pulled back) without changing their email
+  // preferences (hence the null payload)
+  // This ensures the user has to click the checkbox and then click the
+  // 'Continue...' button to sign up.
+  useEffect(() => {
+    return () => {
+      if (!acceptedPrivacyTerms) {
+        acceptTerms(null);
+      }
+    };
+  }, [acceptTerms, acceptedPrivacyTerms]);
+
+  function onClick(isWeeklyEmailAccepted: boolean) {
+    acceptTerms(isWeeklyEmailAccepted);
+  }
+
+  return acceptedPrivacyTerms ? (
+    <RedirectToLearn />
+  ) : (
+    <>
+      <Helmet>
+        <title>{t('misc.email-signup')} | freeCodeCamp.org</title>
+      </Helmet>
+      <Grid className='default-page-wrapper email-sign-up'>
+        <SectionHeader>{t('misc.email-signup')}</SectionHeader>
+        <Row>
+          <IntroDescription />
+          <Col md={8} mdOffset={2} sm={10} smOffset={1} xs={12}>
+            <strong>{t('misc.quincy')}</strong>
+            {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+            {/* @ts-ignore */}
+            <Spacer />
+            <p>{t('misc.email-blast')}</p>
+            {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+            {/* @ts-ignore */}
+            <Spacer />
+          </Col>
+
+          <Col md={4} mdOffset={2} sm={5} smOffset={1} xs={12}>
+            <Button
+              block={true}
+              bsSize='lg'
+              bsStyle='primary'
+              className='big-cta-btn'
+              onClick={() => onClick(true)}
+            >
+              {t('buttons.yes-please')}
+            </Button>
+            <ButtonSpacer />
+          </Col>
+          <Col md={4} sm={5} xs={12}>
+            <Button
+              block={true}
+              bsSize='lg'
+              bsStyle='primary'
+              className='big-cta-btn'
+              onClick={() => onClick(false)}
+            >
+              {t('buttons.no-thanks')}
+            </Button>
+            <ButtonSpacer />
+          </Col>
+          <Col xs={12}>
+            {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+            {/* @ts-ignore */}
+            <Spacer />
+          </Col>
+        </Row>
+      </Grid>
+    </>
+  );
+}
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(withTranslation()(AcceptPrivacyTerms));
diff --git a/client/src/pages/index.js b/client/src/pages/index.js
deleted file mode 100644
index 40b683a191d..00000000000
--- a/client/src/pages/index.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-
-import Landing from '../components/landing';
-import { AllChallengeNode } from '../redux/prop-types';
-
-const IndexPage = () => {
-  return <Landing />;
-};
-
-const propTypes = {
-  data: PropTypes.shape({
-    allChallengeNode: AllChallengeNode
-  })
-};
-
-IndexPage.propTypes = propTypes;
-IndexPage.displayName = 'IndexPage';
-
-export default IndexPage;
diff --git a/client/src/pages/index.tsx b/client/src/pages/index.tsx
new file mode 100644
index 00000000000..38b541bd5a4
--- /dev/null
+++ b/client/src/pages/index.tsx
@@ -0,0 +1,11 @@
+import React from 'react';
+
+import Landing from '../components/landing';
+
+function IndexPage(): JSX.Element {
+  return <Landing />;
+}
+
+IndexPage.displayName = 'IndexPage';
+
+export default IndexPage;
diff --git a/client/src/pages/learn.js b/client/src/pages/learn.tsx
similarity index 73%
rename from client/src/pages/learn.js
rename to client/src/pages/learn.tsx
index 8fe74307a88..f6f5ed7e1b6 100644
--- a/client/src/pages/learn.js
+++ b/client/src/pages/learn.tsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import { Grid, Row, Col } from '@freecodecamp/react-bootstrap';
-import PropTypes from 'prop-types';
 import { createSelector } from 'reselect';
 import { graphql } from 'gatsby';
 import Helmet from 'react-helmet';
@@ -16,38 +15,47 @@ import {
   isSignedInSelector,
   userSelector
 } from '../redux';
-import { ChallengeNode } from '../redux/prop-types';
+
+interface FetchState {
+  pending: boolean;
+  complete: boolean;
+  errored: boolean;
+}
+
+interface User {
+  name: string;
+  username: string;
+  completedChallengeCount: number;
+}
 
 const mapStateToProps = createSelector(
   userFetchStateSelector,
   isSignedInSelector,
   userSelector,
-  (fetchState, isSignedIn, user) => ({
+  (fetchState: FetchState, isSignedIn: boolean, user: User) => ({
     fetchState,
     isSignedIn,
     user
   })
 );
 
-const propTypes = {
-  data: PropTypes.shape({
-    challengeNode: ChallengeNode
-  }),
-  fetchState: PropTypes.shape({
-    pending: PropTypes.bool,
-    complete: PropTypes.bool,
-    errored: PropTypes.bool
-  }),
-  isSignedIn: PropTypes.bool,
-  state: PropTypes.object,
-  user: PropTypes.shape({
-    name: PropTypes.string,
-    username: PropTypes.string,
-    completedChallengeCount: PropTypes.number
-  })
-};
+interface Slug {
+  slug: string;
+}
 
-const LearnPage = ({
+interface LearnPageProps {
+  isSignedIn: boolean;
+  fetchState: FetchState;
+  state: Record<string, unknown>;
+  user: User;
+  data: {
+    challengeNode: {
+      fields: Slug;
+    };
+  };
+}
+
+function LearnPage({
   isSignedIn,
   fetchState: { pending, complete },
   user: { name = '', completedChallengeCount = 0 },
@@ -56,7 +64,7 @@ const LearnPage = ({
       fields: { slug }
     }
   }
-}) => {
+}: LearnPageProps) {
   const { t } = useTranslation();
 
   return (
@@ -74,16 +82,17 @@ const LearnPage = ({
               slug={slug}
             />
             <Map />
+            {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+            {/* @ts-ignore */}
             <Spacer size={2} />
           </Col>
         </Row>
       </Grid>
     </LearnLayout>
   );
-};
+}
 
 LearnPage.displayName = 'LearnPage';
-LearnPage.propTypes = propTypes;
 
 export default connect(mapStateToProps)(LearnPage);
 
diff --git a/client/src/pages/settings.js b/client/src/pages/settings.tsx
similarity index 76%
rename from client/src/pages/settings.js
rename to client/src/pages/settings.tsx
index c89a0d47e02..2a5957a5836 100644
--- a/client/src/pages/settings.js
+++ b/client/src/pages/settings.tsx
@@ -5,10 +5,12 @@ import { withPrefix } from 'gatsby';
 import RedirectHome from '../components/RedirectHome';
 import ShowSettings from '../client-only-routes/show-settings';
 
-function Settings() {
+function Settings(): JSX.Element {
   return (
     <Router>
       <ShowSettings path={withPrefix('/settings')} />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <RedirectHome default={true} />
     </Router>
   );
diff --git a/client/src/pages/unsubscribed.js b/client/src/pages/unsubscribed.tsx
similarity index 61%
rename from client/src/pages/unsubscribed.js
rename to client/src/pages/unsubscribed.tsx
index 2670a37174f..7131356e390 100644
--- a/client/src/pages/unsubscribed.js
+++ b/client/src/pages/unsubscribed.tsx
@@ -5,11 +5,17 @@ import { withPrefix } from 'gatsby';
 import RedirectHome from '../components/RedirectHome';
 import ShowUnsubscribed from '../client-only-routes/show-unsubscribed';
 
-function Unsubscribed() {
+function Unsubscribed(): JSX.Element {
   return (
     <Router>
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <ShowUnsubscribed path={withPrefix('/unsubscribed/:unsubscribeId')} />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <ShowUnsubscribed path={withPrefix('/unsubscribed')} />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <RedirectHome default={true} />
     </Router>
   );
diff --git a/client/src/pages/update-email.js b/client/src/pages/update-email.js
deleted file mode 100644
index 6c0b63814e9..00000000000
--- a/client/src/pages/update-email.js
+++ /dev/null
@@ -1,144 +0,0 @@
-import React, { Component, Fragment } from 'react';
-import PropTypes from 'prop-types';
-import { Link } from 'gatsby';
-import { bindActionCreators } from 'redux';
-import { connect } from 'react-redux';
-import { createSelector } from 'reselect';
-import {
-  Form,
-  FormGroup,
-  FormControl,
-  ControlLabel,
-  Grid,
-  Row,
-  Col,
-  Button
-} from '@freecodecamp/react-bootstrap';
-import Helmet from 'react-helmet';
-import isEmail from 'validator/lib/isEmail';
-import { isString } from 'lodash-es';
-import { withTranslation } from 'react-i18next';
-
-import { Spacer } from '../components/helpers';
-import './update-email.css';
-import { userSelector } from '../redux';
-import { updateMyEmail } from '../redux/settings';
-import { maybeEmailRE } from '../utils';
-
-const propTypes = {
-  isNewEmail: PropTypes.bool,
-  t: PropTypes.func.isRequired,
-  updateMyEmail: PropTypes.func.isRequired
-};
-
-const mapStateToProps = createSelector(
-  userSelector,
-  ({ email, emailVerified }) => ({
-    isNewEmail: !email || emailVerified
-  })
-);
-
-const mapDispatchToProps = dispatch =>
-  bindActionCreators({ updateMyEmail }, dispatch);
-
-class UpdateEmail extends Component {
-  constructor(props) {
-    super(props);
-
-    this.state = {
-      emailValue: ''
-    };
-
-    this.onChange = this.onChange.bind(this);
-  }
-
-  handleSubmit = e => {
-    e.preventDefault();
-    const { emailValue } = this.state;
-    const { updateMyEmail } = this.props;
-    return updateMyEmail(emailValue);
-  };
-
-  onChange(e) {
-    const change = e.target.value;
-    if (!isString(change)) {
-      return null;
-    }
-    return this.setState({
-      emailValue: change
-    });
-  }
-
-  getEmailValidationState() {
-    const { emailValue } = this.state;
-    if (maybeEmailRE.test(emailValue)) {
-      return isEmail(emailValue) ? 'success' : 'error';
-    }
-    return null;
-  }
-
-  render() {
-    const { isNewEmail, t } = this.props;
-    return (
-      <Fragment>
-        <Helmet>
-          <title>{t('misc.update-email-1')} | freeCodeCamp.org</title>
-        </Helmet>
-        <Spacer />
-        <h2 className='text-center'>{t('misc.update-email-2')}</h2>
-        <Grid>
-          <Row>
-            <Col sm={6} smOffset={3}>
-              <Row>
-                <Form horizontal={true} onSubmit={this.handleSubmit}>
-                  <FormGroup
-                    controlId='emailInput'
-                    validationState={this.getEmailValidationState()}
-                  >
-                    <Col
-                      className='email-label'
-                      componentClass={ControlLabel}
-                      sm={2}
-                    >
-                      {t('misc.email')}
-                    </Col>
-                    <Col sm={10}>
-                      <FormControl
-                        onChange={this.onChange}
-                        placeholder='camperbot@example.com'
-                        required={true}
-                        type='email'
-                      />
-                    </Col>
-                  </FormGroup>
-                  <Button
-                    block={true}
-                    bsSize='lg'
-                    bsStyle='primary'
-                    disabled={this.getEmailValidationState() !== 'success'}
-                    type='submit'
-                  >
-                    {isNewEmail
-                      ? t('buttons.update-email')
-                      : t('buttons.verify-email')}
-                  </Button>
-                </Form>
-                <p className='text-center'>
-                  <Link to='/signout'>{t('buttons.sign-out')}</Link>
-                </p>
-              </Row>
-            </Col>
-          </Row>
-        </Grid>
-      </Fragment>
-    );
-  }
-}
-
-UpdateEmail.displayName = 'Update-Email';
-UpdateEmail.propTypes = propTypes;
-
-export default connect(
-  mapStateToProps,
-  mapDispatchToProps
-)(withTranslation()(UpdateEmail));
diff --git a/client/src/pages/update-email.tsx b/client/src/pages/update-email.tsx
new file mode 100644
index 00000000000..2fa62262249
--- /dev/null
+++ b/client/src/pages/update-email.tsx
@@ -0,0 +1,132 @@
+import React, { useState } from 'react';
+import type { FormEvent, ChangeEvent } from 'react';
+import { Link } from 'gatsby';
+import { bindActionCreators } from 'redux';
+import type { Dispatch } from 'redux';
+import { connect } from 'react-redux';
+import { createSelector } from 'reselect';
+import {
+  Form,
+  FormGroup,
+  FormControl,
+  ControlLabel,
+  Grid,
+  Row,
+  Col,
+  Button
+} from '@freecodecamp/react-bootstrap';
+import Helmet from 'react-helmet';
+import isEmail from 'validator/lib/isEmail';
+import { isString } from 'lodash-es';
+import { withTranslation } from 'react-i18next';
+
+import { Spacer } from '../components/helpers';
+import './update-email.css';
+import { userSelector } from '../redux';
+import { updateMyEmail } from '../redux/settings';
+import { maybeEmailRE } from '../utils';
+
+interface UpdateEmailProps {
+  isNewEmail: boolean;
+  t: (s: string) => string;
+  updateMyEmail: (e: string) => void;
+}
+
+const mapStateToProps = createSelector(
+  userSelector,
+  ({ email, emailVerified }: { email: string; emailVerified: boolean }) => ({
+    isNewEmail: !email || emailVerified
+  })
+);
+
+const mapDispatchToProps = (dispatch: Dispatch) =>
+  bindActionCreators({ updateMyEmail }, dispatch);
+
+function UpdateEmail({ isNewEmail, t, updateMyEmail }: UpdateEmailProps) {
+  const [emailValue, setEmailValue] = useState('');
+
+  function handleSubmit(event: FormEvent) {
+    event.preventDefault();
+    updateMyEmail(emailValue);
+  }
+
+  function onChange(event: ChangeEvent) {
+    const change = (event.target as HTMLInputElement).value;
+    if (!isString(change)) {
+      return null;
+    }
+    setEmailValue(change);
+    return null;
+  }
+
+  function getEmailValidationState() {
+    if (maybeEmailRE.test(emailValue)) {
+      return isEmail(emailValue) ? 'success' : 'error';
+    }
+    return null;
+  }
+
+  return (
+    <>
+      <Helmet>
+        <title>{t('misc.update-email-1')} | freeCodeCamp.org</title>
+      </Helmet>
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
+      <Spacer />
+      <h2 className='text-center'>{t('misc.update-email-2')}</h2>
+      <Grid>
+        <Row>
+          <Col sm={6} smOffset={3}>
+            <Row>
+              <Form horizontal={true} onSubmit={handleSubmit}>
+                <FormGroup
+                  controlId='emailInput'
+                  validationState={getEmailValidationState()}
+                >
+                  <Col
+                    className='email-label'
+                    // TODO
+                    componentClass={ControlLabel as unknown}
+                    sm={2}
+                  >
+                    {t('misc.email')}
+                  </Col>
+                  <Col sm={10}>
+                    <FormControl
+                      onChange={onChange}
+                      placeholder='camperbot@example.com'
+                      required={true}
+                      type='email'
+                    />
+                  </Col>
+                </FormGroup>
+                <Button
+                  block={true}
+                  bsSize='lg'
+                  bsStyle='primary'
+                  disabled={getEmailValidationState() !== 'success'}
+                  type='submit'
+                >
+                  {isNewEmail
+                    ? t('buttons.update-email')
+                    : t('buttons.verify-email')}
+                </Button>
+              </Form>
+              <p className='text-center'>
+                <Link to='/signout'>{t('buttons.sign-out')}</Link>
+              </p>
+            </Row>
+          </Col>
+        </Row>
+      </Grid>
+    </>
+  );
+}
+
+UpdateEmail.displayName = 'Update-Email';
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(withTranslation()(UpdateEmail));
diff --git a/client/src/pages/user.js b/client/src/pages/user.tsx
similarity index 76%
rename from client/src/pages/user.js
rename to client/src/pages/user.tsx
index 1717ae3c27a..9ac7eb11405 100644
--- a/client/src/pages/user.js
+++ b/client/src/pages/user.tsx
@@ -5,10 +5,12 @@ import { withPrefix } from 'gatsby';
 import RedirectHome from '../components/RedirectHome';
 import ShowUser from '../client-only-routes/show-user';
 
-function User() {
+function User(): JSX.Element {
   return (
     <Router>
       <ShowUser path={withPrefix('/user/:username/report-user')} />
+      {/* eslint-disable-next-line @typescript-eslint/ban-ts-comment */}
+      {/* @ts-ignore */}
       <RedirectHome default={true} />
     </Router>
   );