diff --git a/src/content-tags-drawer/ContentTagsCollapsible.jsx b/src/content-tags-drawer/ContentTagsCollapsible.jsx
index 8a7374fcc5..bbc9879c67 100644
--- a/src/content-tags-drawer/ContentTagsCollapsible.jsx
+++ b/src/content-tags-drawer/ContentTagsCollapsible.jsx
@@ -25,9 +25,9 @@ import TagsTree from './TagsTree';
 import { ContentTagsDrawerContext } from './common/context';
 
 /** @typedef {import("./ContentTagsCollapsible").TaxonomySelectProps} TaxonomySelectProps */
-/** @typedef {import("../taxonomy/data/types.mjs").TaxonomyData} TaxonomyData */
-/** @typedef {import("./data/types.mjs").Tag} ContentTagData */
-/** @typedef {import("./data/types.mjs").StagedTagData} StagedTagData */
+/** @typedef {import("../taxonomy/data/types.js").TaxonomyData} TaxonomyData */
+/** @typedef {import("./data/types.js").Tag} ContentTagData */
+/** @typedef {import("./data/types.js").StagedTagData} StagedTagData */
 
 /**
  * Custom Menu component for our Select box
diff --git a/src/content-tags-drawer/ContentTagsCollapsibleHelper.jsx b/src/content-tags-drawer/ContentTagsCollapsibleHelper.jsx
index dcc016ab8a..26e27a1188 100644
--- a/src/content-tags-drawer/ContentTagsCollapsibleHelper.jsx
+++ b/src/content-tags-drawer/ContentTagsCollapsibleHelper.jsx
@@ -6,11 +6,11 @@ import { cloneDeep } from 'lodash';
 import { useContentTaxonomyTagsUpdater } from './data/apiHooks';
 import { ContentTagsDrawerContext } from './common/context';
 
-/** @typedef {import("../taxonomy/data/types.mjs").TaxonomyData} TaxonomyData */
-/** @typedef {import("./data/types.mjs").Tag} ContentTagData */
+/** @typedef {import("../taxonomy/data/types.js").TaxonomyData} TaxonomyData */
+/** @typedef {import("./data/types.js").Tag} ContentTagData */
 /** @typedef {import("./ContentTagsCollapsible").TagTreeEntry} TagTreeEntry */
-/** @typedef {import("./data/types.mjs").StagedTagData} StagedTagData */
-/** @typedef {import("./data/types.mjs").UpdateTagsData} UpdateTagsData */
+/** @typedef {import("./data/types.js").StagedTagData} StagedTagData */
+/** @typedef {import("./data/types.js").UpdateTagsData} UpdateTagsData */
 
 /**
  * Util function that sorts the keys of a tree in alphabetical order.
diff --git a/src/content-tags-drawer/ContentTagsDrawer.tsx b/src/content-tags-drawer/ContentTagsDrawer.tsx
index 4f225666fd..da025f59f0 100644
--- a/src/content-tags-drawer/ContentTagsDrawer.tsx
+++ b/src/content-tags-drawer/ContentTagsDrawer.tsx
@@ -12,7 +12,7 @@ import classNames from 'classnames';
 import messages from './messages';
 import ContentTagsCollapsible from './ContentTagsCollapsible';
 import Loading from '../generic/Loading';
-import useContentTagsDrawerContext from './ContentTagsDrawerHelper';
+import { useCreateContentTagsDrawerContext } from './ContentTagsDrawerHelper';
 import { ContentTagsDrawerContext, ContentTagsDrawerSheetContext } from './common/context';
 
 interface TaxonomyListProps {
@@ -246,7 +246,7 @@ const ContentTagsDrawer = ({
     throw new Error('Error: contentId cannot be null.');
   }
 
-  const context = useContentTagsDrawerContext(contentId, !readOnly);
+  const context = useCreateContentTagsDrawerContext(contentId, !readOnly);
   const { blockingSheet } = useContext(ContentTagsDrawerSheetContext);
 
   const {
diff --git a/src/content-tags-drawer/ContentTagsDrawerHelper.jsx b/src/content-tags-drawer/ContentTagsDrawerHelper.jsx
index 2c9bec15bb..49b4d28532 100644
--- a/src/content-tags-drawer/ContentTagsDrawerHelper.jsx
+++ b/src/content-tags-drawer/ContentTagsDrawerHelper.jsx
@@ -8,46 +8,21 @@ import { extractOrgFromContentId, languageExportId } from './utils';
 import messages from './messages';
 import { ContentTagsDrawerSheetContext } from './common/context';
 
-/** @typedef {import("./data/types.mjs").Tag} ContentTagData */
-/** @typedef {import("./data/types.mjs").StagedTagData} StagedTagData */
-/** @typedef {import("./data/types.mjs").TagsInTaxonomy} TagsInTaxonomy */
+/** @typedef {import("./data/types.js").Tag} ContentTagData */
+/** @typedef {import("./data/types.js").StagedTagData} StagedTagData */
+/** @typedef {import("./data/types.js").TagsInTaxonomy} TagsInTaxonomy */
+/** @typedef {import("./common/context").ContentTagsDrawerContextData} ContentTagsDrawerContextData */
 
 /**
- * Handles the context and all the underlying logic for the ContentTagsDrawer component
+ * Helper hook for *creating* a `ContentTagsDrawerContext`.
+ * Handles the context and all the underlying logic for the ContentTagsDrawer component.
+ *
+ * To *use* the context, just use `useContext(ContentTagsDrawerContext)`
  * @param {string} contentId
  * @param {boolean} canTagObject
- * @returns {{
- *     stagedContentTags: Record<number, StagedTagData[]>,
- *     addStagedContentTag: (taxonomyId: number, addedTag: StagedTagData) => void,
- *     removeStagedContentTag: (taxonomyId: number, tagValue: string) => void,
- *     removeGlobalStagedContentTag: (taxonomyId: number, tagValue: string) => void,
- *     addRemovedContentTag: (taxonomyId: number, tagValue: string) => void,
- *     deleteRemovedContentTag: (taxonomyId: number, tagValue: string) => void,
- *     setStagedTags: (taxonomyId: number, tagsList: StagedTagData[]) => void,
- *     globalStagedContentTags: Record<number, StagedTagData[]>,
- *     globalStagedRemovedContentTags: Record<number, string>,
- *     setGlobalStagedContentTags: Function,
- *     commitGlobalStagedTags: () => void,
- *     commitGlobalStagedTagsStatus: string,
- *     isContentDataLoaded: boolean,
- *     isContentTaxonomyTagsLoaded: boolean,
- *     isTaxonomyListLoaded: boolean,
- *     contentName: string,
- *     tagsByTaxonomy: TagsInTaxonomy[],
- *     isEditMode: boolean,
- *     toEditMode: () => void,
- *     toReadMode: () => void,
- *     collapsibleStates: Record<number, boolean>,
- *     openCollapsible: (taxonomyId: number) => void,
- *     closeCollapsible: (taxonomyId: number) => void,
- *     toastMessage: string | undefined,
- *     showToastAfterSave: () => void,
- *     closeToast: () => void,
- *     setCollapsibleToInitalState: () => void,
- *     otherTaxonomies: TagsInTaxonomy[],
- * }}
+ * @returns {ContentTagsDrawerContextData}
  */
-const useContentTagsDrawerContext = (contentId, canTagObject) => {
+export const useCreateContentTagsDrawerContext = (contentId, canTagObject) => {
   const intl = useIntl();
   const org = extractOrgFromContentId(contentId);
 
@@ -465,5 +440,3 @@ const useContentTagsDrawerContext = (contentId, canTagObject) => {
     otherTaxonomies,
   };
 };
-
-export default useContentTagsDrawerContext;
diff --git a/src/content-tags-drawer/TagOutlineIcon.jsx b/src/content-tags-drawer/TagOutlineIcon.tsx
similarity index 100%
rename from src/content-tags-drawer/TagOutlineIcon.jsx
rename to src/content-tags-drawer/TagOutlineIcon.tsx
diff --git a/src/content-tags-drawer/common/context.js b/src/content-tags-drawer/common/context.js
deleted file mode 100644
index a1379fff3e..0000000000
--- a/src/content-tags-drawer/common/context.js
+++ /dev/null
@@ -1,48 +0,0 @@
-// @ts-check
-import React from 'react';
-
-/** @typedef {import("../data/types.mjs").TagsInTaxonomy} TagsInTaxonomy */
-/** @typedef {import("../data/types.mjs").StagedTagData} StagedTagData */
-
-/* istanbul ignore next */
-export const ContentTagsDrawerContext = React.createContext({
-  stagedContentTags: /** @type{Record<number, StagedTagData[]>} */ ({}),
-  globalStagedContentTags: /** @type{Record<number, StagedTagData[]>} */ ({}),
-  globalStagedRemovedContentTags: /** @type{Record<number, string>} */ ({}),
-  addStagedContentTag: /** @type{(taxonomyId: number, addedTag: StagedTagData) => void} */ (() => {}),
-  removeStagedContentTag: /** @type{(taxonomyId: number, tagValue: string) => void} */ (() => {}),
-  removeGlobalStagedContentTag: /** @type{(taxonomyId: number, tagValue: string) => void} */ (() => {}),
-  addRemovedContentTag: /** @type{(taxonomyId: number, tagValue: string) => void} */ (() => {}),
-  deleteRemovedContentTag: /** @type{(taxonomyId: number, tagValue: string) => void} */ (() => {}),
-  setStagedTags: /** @type{(taxonomyId: number, tagsList: StagedTagData[]) => void} */ (() => {}),
-  setGlobalStagedContentTags: /** @type{Function} */ (() => {}),
-  commitGlobalStagedTags: /** @type{() => void} */ (() => {}),
-  commitGlobalStagedTagsStatus: /** @type{null|string} */ (null),
-  isContentDataLoaded: /** @type{boolean} */ (false),
-  isContentTaxonomyTagsLoaded: /** @type{boolean} */ (false),
-  isTaxonomyListLoaded: /** @type{boolean} */ (false),
-  contentName: /** @type{string} */ (''),
-  tagsByTaxonomy: /** @type{TagsInTaxonomy[]} */ ([]),
-  isEditMode: /** @type{boolean} */ (false),
-  toEditMode: /** @type{() => void} */ (() => {}),
-  toReadMode: /** @type{() => void} */ (() => {}),
-  collapsibleStates: /** @type{Record<number, boolean>} */ ({}),
-  openCollapsible: /** @type{(taxonomyId: number) => void} */ (() => {}),
-  closeCollapsible: /** @type{(taxonomyId: number) => void} */ (() => {}),
-  toastMessage: /** @type{string|undefined} */ (undefined),
-  showToastAfterSave: /** @type{() => void} */ (() => {}),
-  closeToast: /** @type{() => void} */ (() => {}),
-  setCollapsibleToInitalState: /** @type{() => void} */ (() => {}),
-  otherTaxonomies: /** @type{TagsInTaxonomy[]} */ ([]),
-});
-
-// This context has not been added to ContentTagsDrawerContext because it has been
-// created one level higher to control the behavior of the Sheet that contatins the Drawer.
-// This logic is not used in legacy edx-platform screens. But it can be separated if we keep
-// the contexts separate.
-// TODO We can join both contexts when the Drawer is no longer used on edx-platform
-/* istanbul ignore next */
-export const ContentTagsDrawerSheetContext = React.createContext({
-  blockingSheet: /** @type{boolean} */ (false),
-  setBlockingSheet: /** @type{Function} */ (() => {}),
-});
diff --git a/src/content-tags-drawer/common/context.ts b/src/content-tags-drawer/common/context.ts
new file mode 100644
index 0000000000..6f4d76b76a
--- /dev/null
+++ b/src/content-tags-drawer/common/context.ts
@@ -0,0 +1,77 @@
+import React from 'react';
+
+import type { TagsInTaxonomy, StagedTagData } from '../data/types';
+
+export interface ContentTagsDrawerContextData {
+  stagedContentTags: Record<number, StagedTagData[]>;
+  globalStagedContentTags: Record<number, StagedTagData[]>;
+  globalStagedRemovedContentTags: Record<number, string>;
+  addStagedContentTag: (taxonomyId: number, addedTag: StagedTagData) => void;
+  removeStagedContentTag: (taxonomyId: number, tagValue: string) => void;
+  removeGlobalStagedContentTag: (taxonomyId: number, tagValue: string) => void;
+  addRemovedContentTag: (taxonomyId: number, tagValue: string) => void;
+  deleteRemovedContentTag: (taxonomyId: number, tagValue: string) => void;
+  setStagedTags: (taxonomyId: number, tagsList: StagedTagData[]) => void;
+  setGlobalStagedContentTags: Function;
+  commitGlobalStagedTags: () => void;
+  commitGlobalStagedTagsStatus: null | string;
+  isContentDataLoaded: boolean;
+  isContentTaxonomyTagsLoaded: boolean;
+  isTaxonomyListLoaded: boolean;
+  contentName: string;
+  tagsByTaxonomy: TagsInTaxonomy[];
+  isEditMode: boolean;
+  toEditMode: () => void;
+  toReadMode: () => void;
+  collapsibleStates: Record<number, boolean>;
+  openCollapsible: (taxonomyId: number) => void;
+  closeCollapsible: (taxonomyId: number) => void;
+  toastMessage: string | undefined;
+  showToastAfterSave: () => void;
+  closeToast: () => void;
+  setCollapsibleToInitalState: () => void;
+  otherTaxonomies: TagsInTaxonomy[];
+}
+
+/* istanbul ignore next */
+export const ContentTagsDrawerContext = React.createContext<ContentTagsDrawerContextData>({
+  stagedContentTags: {},
+  globalStagedContentTags: {},
+  globalStagedRemovedContentTags: {},
+  addStagedContentTag: () => {},
+  removeStagedContentTag: () => {},
+  removeGlobalStagedContentTag: () => {},
+  addRemovedContentTag: () => {},
+  deleteRemovedContentTag: () => {},
+  setStagedTags: () => {},
+  setGlobalStagedContentTags: () => {},
+  commitGlobalStagedTags: () => {},
+  commitGlobalStagedTagsStatus: null,
+  isContentDataLoaded: false,
+  isContentTaxonomyTagsLoaded: false,
+  isTaxonomyListLoaded: false,
+  contentName: '',
+  tagsByTaxonomy: [],
+  isEditMode: false,
+  toEditMode: () => {},
+  toReadMode: () => {},
+  collapsibleStates: {},
+  openCollapsible: () => {},
+  closeCollapsible: () => {},
+  toastMessage: undefined,
+  showToastAfterSave: () => {},
+  closeToast: () => {},
+  setCollapsibleToInitalState: () => {},
+  otherTaxonomies: [],
+});
+
+// This context has not been added to ContentTagsDrawerContext because it has been
+// created one level higher to control the behavior of the Sheet that contatins the Drawer.
+// This logic is not used in legacy edx-platform screens. But it can be separated if we keep
+// the contexts separate.
+// TODO We can join both contexts when the Drawer is no longer used on edx-platform
+/* istanbul ignore next */
+export const ContentTagsDrawerSheetContext = React.createContext({
+  blockingSheet: false,
+  setBlockingSheet: (() => {}) as (blockingSheet: boolean) => void,
+});
diff --git a/src/content-tags-drawer/data/api.js b/src/content-tags-drawer/data/api.js
index 94841f7c9b..e2534e9b89 100644
--- a/src/content-tags-drawer/data/api.js
+++ b/src/content-tags-drawer/data/api.js
@@ -38,7 +38,7 @@ export const getContentTaxonomyTagsCountApiUrl = (contentId) => new URL(`api/con
  * Get all tags that belong to taxonomy.
  * @param {number} taxonomyId The id of the taxonomy to fetch tags for
  * @param {{page?: number, searchTerm?: string, parentTag?: string}} options
- * @returns {Promise<import("../../taxonomy/tag-list/data/types.mjs").TagListData>}
+ * @returns {Promise<import("../../taxonomy/data/types.js").TagListData>}
  */
 export async function getTaxonomyTagsData(taxonomyId, options = {}) {
   const url = getTaxonomyTagsApiUrl(taxonomyId, options);
@@ -49,7 +49,7 @@ export async function getTaxonomyTagsData(taxonomyId, options = {}) {
 /**
  * Get the tags that are applied to the content object
  * @param {string} contentId The id of the content object to fetch the applied tags for
- * @returns {Promise<import("./types.mjs").ContentTaxonomyTagsData>}
+ * @returns {Promise<import("./types.js").ContentTaxonomyTagsData>}
  */
 export async function getContentTaxonomyTagsData(contentId) {
   const { data } = await getAuthenticatedHttpClient().get(getContentTaxonomyTagsApiUrl(contentId));
@@ -72,7 +72,7 @@ export async function getContentTaxonomyTagsCount(contentId) {
 /**
  * Fetch meta data (eg: display_name) about the content object (unit/compoenent)
  * @param {string} contentId The id of the content object (unit/component)
- * @returns {Promise<import("./types.mjs").ContentData | null>}
+ * @returns {Promise<import("./types.js").ContentData | null>}
  */
 export async function getContentData(contentId) {
   let url;
@@ -96,8 +96,8 @@ export async function getContentData(contentId) {
 /**
  * Update content object's applied tags
  * @param {string} contentId The id of the content object (unit/component)
- * @param {Promise<import("./types.mjs").UpdateTagsData[]>} tagsData The list of tags (values) to set on content object
- * @returns {Promise<import("./types.mjs").ContentTaxonomyTagsData>}
+ * @param {Promise<import("./types.js").UpdateTagsData[]>} tagsData The list of tags (values) to set on content object
+ * @returns {Promise<import("./types.js").ContentTaxonomyTagsData>}
  */
 export async function updateContentTaxonomyTags(contentId, tagsData) {
   const url = getContentTaxonomyTagsApiUrl(contentId);
diff --git a/src/content-tags-drawer/data/apiHooks.jsx b/src/content-tags-drawer/data/apiHooks.jsx
index 5b90a6da85..f7e5dd2c13 100644
--- a/src/content-tags-drawer/data/apiHooks.jsx
+++ b/src/content-tags-drawer/data/apiHooks.jsx
@@ -17,8 +17,8 @@ import {
 import { libraryQueryPredicate, xblockQueryKeys } from '../../library-authoring/data/apiHooks';
 import { getLibraryId } from '../../generic/key-utils';
 
-/** @typedef {import("../../taxonomy/tag-list/data/types.mjs").TagListData} TagListData */
-/** @typedef {import("../../taxonomy/tag-list/data/types.mjs").TagData} TagData */
+/** @typedef {import("../../taxonomy/data/types.js").TagListData} TagListData */
+/** @typedef {import("../../taxonomy/data/types.js").TagData} TagData */
 
 /**
  * Builds the query to get the taxonomy tags
@@ -133,7 +133,7 @@ export const useContentTaxonomyTagsUpdater = (contentId) => {
      *   any,
      *   any,
      *   {
-     *     tagsData: Promise<import("./types.mjs").UpdateTagsData[]>
+     *     tagsData: Promise<import("./types.js").UpdateTagsData[]>
      *   }
      * >}
      */
diff --git a/src/content-tags-drawer/data/types.mjs b/src/content-tags-drawer/data/types.mjs
deleted file mode 100644
index 42de8e3a23..0000000000
--- a/src/content-tags-drawer/data/types.mjs
+++ /dev/null
@@ -1,101 +0,0 @@
-// @ts-check
-
-/**
- * @typedef {Object} Tag A tag that has been applied to some content.
- * @property {string} value The value of the tag, also its ID. e.g. "Biology"
- * @property {string[]} lineage The values of the tag and its parent(s) in the hierarchy
- * @property {boolean} canChangeObjecttag
- * @property {boolean} canDeleteObjecttag
- */
-
-/**
- * @typedef {Object} ContentTaxonomyTagData A list of the tags from one taxonomy that are applied to a content object.
- * @property {string} name
- * @property {number} taxonomyId
- * @property {boolean} canTagObject
- * @property {Tag[]} tags
- * @property {string} exportId
- */
-
-/**
- * @typedef {Object} ContentTaxonomyTagsData A list of all the tags applied to some content object, grouped by taxonomy.
- * @property {ContentTaxonomyTagData[]} taxonomies
- */
-
-/**
- * @typedef {Object} ContentActions
- * @property {boolean} deleteable
- * @property {boolean} draggable
- * @property {boolean} childAddable
- * @property {boolean} duplicable
- */
-
-/**
- * @typedef {Object} XBlockData
- * @property {string} id
- * @property {string} displayName
- * @property {string} category
- * @property {boolean} hasChildren
- * @property {string} editedOn
- * @property {boolean} published
- * @property {string} publishedOn
- * @property {string} studioUrl
- * @property {boolean} releasedToStudents
- * @property {string|null} releaseDate
- * @property {string} visibilityState
- * @property {boolean} hasExplicitStaffLock
- * @property {string} start
- * @property {boolean} graded
- * @property {string} dueDate
- * @property {string} due
- * @property {string|null} relativeWeeksDue
- * @property {string|null} format
- * @property {boolean} hasChanges
- * @property {ContentActions} actions
- * @property {string} explanatoryMessage
- * @property {string} showCorrectness
- * @property {boolean} discussionEnabled
- * @property {boolean} ancestorHasStaffLock
- * @property {boolean} staffOnlyMessage
- * @property {boolean} hasPartitionGroupComponents
- */
-
-/**
- * @typedef {Object} TagsInTaxonomy
- * @property {boolean} allOrgs
- * @property {boolean} allowFreeText
- * @property {boolean} allowMultiple
- * @property {boolean} canChangeTaxonomy
- * @property {boolean} canDeleteTaxonomy
- * @property {boolean} canTagObject
- * @property {Tag[]} contentTags
- * @property {string} description
- * @property {boolean} enabled
- * @property {string} exportId
- * @property {number} id
- * @property {string} name
- * @property {boolean} systemDefined
- * @property {number} tagsCount
- * @property {boolean} visibleToAuthors
- */
-
-/**
-  * @typedef {Object} CourseData
-  * @property {string} courseDisplayNameWithDefault
-  */
-
-/**
- * @typedef {XBlockData | CourseData} ContentData
- */
-
-/**
- * @typedef {Object} UpdateTagsData
- * @property {number} taxonomy
- * @property {string[]} tags
- */
-
-/**
- * @typedef {Object} StagedTagData
- * @property {string} value
- * @property {string} label
- */
\ No newline at end of file
diff --git a/src/content-tags-drawer/data/types.ts b/src/content-tags-drawer/data/types.ts
new file mode 100644
index 0000000000..127be3dc9b
--- /dev/null
+++ b/src/content-tags-drawer/data/types.ts
@@ -0,0 +1,81 @@
+import type { TaxonomyData } from '../../taxonomy/data/types';
+
+/** A tag that has been applied to some content. */
+export interface Tag {
+  /** The value of the tag, also its ID. e.g. "Biology" */
+  value: string;
+  /** The values of the tag and its parent(s) in the hierarchy */
+  lineage: string[];
+  canChangeObjecttag: boolean;
+  canDeleteObjecttag: boolean;
+}
+
+/** A list of the tags from one taxonomy that are applied to a content object. */
+export interface ContentTaxonomyTagData {
+  name: string;
+  taxonomyId: number;
+  canTagObject: boolean;
+  tags: Tag[];
+  exportId: string;
+}
+
+/** A list of all the tags applied to some content object, grouped by taxonomy. */
+export interface ContentTaxonomyTagsData {
+  taxonomies: ContentTaxonomyTagData[];
+}
+
+export interface ContentActions {
+  deleteable: boolean;
+  draggable: boolean;
+  childAddable: boolean;
+  duplicable: boolean;
+}
+
+export interface XBlockData {
+  id: string;
+  displayName: string;
+  category: string;
+  hasChildren: boolean;
+  editedOn: string;
+  published: boolean;
+  publishedOn: string;
+  studioUrl: string;
+  releasedToStudents: boolean;
+  releaseDate: string | null;
+  visibilityState: string;
+  hasExplicitStaffLock: boolean;
+  start: string;
+  graded: boolean;
+  dueDate: string;
+  due: string;
+  relativeWeeksDue: string | null;
+  format: string | null;
+  hasChanges: boolean;
+  actions: ContentActions;
+  explanatoryMessage: string;
+  showCorrectness: string;
+  discussionEnabled: boolean;
+  ancestorHasStaffLock: boolean;
+  staffOnlyMessage: boolean;
+  hasPartitionGroupComponents: boolean;
+}
+
+export interface TagsInTaxonomy extends TaxonomyData {
+  contentTags: Tag[];
+}
+
+export interface CourseData {
+  courseDisplayNameWithDefault: string;
+}
+
+export type ContentData = XBlockData | CourseData;
+
+export interface UpdateTagsData {
+  taxonomy: number;
+  tags: string[];
+}
+
+export interface StagedTagData {
+  value: string;
+  label: string;
+}
diff --git a/src/content-tags-drawer/messages.js b/src/content-tags-drawer/messages.ts
similarity index 100%
rename from src/content-tags-drawer/messages.js
rename to src/content-tags-drawer/messages.ts
diff --git a/src/content-tags-drawer/utils.js b/src/content-tags-drawer/utils.js
deleted file mode 100644
index 81849805b9..0000000000
--- a/src/content-tags-drawer/utils.js
+++ /dev/null
@@ -1,2 +0,0 @@
-export const extractOrgFromContentId = (contentId) => contentId.split('+')[0].split(':')[1];
-export const languageExportId = 'languages-v1';
diff --git a/src/content-tags-drawer/utils.ts b/src/content-tags-drawer/utils.ts
new file mode 100644
index 0000000000..ff1d71321a
--- /dev/null
+++ b/src/content-tags-drawer/utils.ts
@@ -0,0 +1,2 @@
+export const extractOrgFromContentId = (contentId: string): string => contentId.split('+')[0].split(':')[1];
+export const languageExportId = 'languages-v1';
diff --git a/src/taxonomy/common/context.js b/src/taxonomy/common/context.js
deleted file mode 100644
index a1179efb29..0000000000
--- a/src/taxonomy/common/context.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// @ts-check
-import React from 'react';
-
-/**
- * @typedef AlertProps
- * @type {Object}
- * @property {React.ReactNode} title - title of the alert.
- * @property {React.ReactNode} description - description of the alert.
- */
-export const TaxonomyContext = React.createContext({
-  toastMessage: /** @type{null|string} */ (null),
-  setToastMessage: /** @type{null|React.Dispatch<React.SetStateAction<null|string>>} */ (null),
-  alertProps: /** @type{null|AlertProps} */ (null),
-  setAlertProps: /** @type{null|React.Dispatch<React.SetStateAction<null|AlertProps>>} */ (null),
-});
diff --git a/src/taxonomy/common/context.ts b/src/taxonomy/common/context.ts
new file mode 100644
index 0000000000..502d3e070d
--- /dev/null
+++ b/src/taxonomy/common/context.ts
@@ -0,0 +1,22 @@
+import React from 'react';
+
+export interface AlertProps {
+  /** title of the alert */
+  title: React.ReactNode;
+  /** description of the alert */
+  description: React.ReactNode;
+}
+
+export interface TaxonomyContextData {
+  toastMessage: null | string;
+  setToastMessage: null | React.Dispatch<React.SetStateAction<null | string>>;
+  alertProps: null | AlertProps;
+  setAlertProps: null | React.Dispatch<React.SetStateAction<null | AlertProps>>;
+}
+
+export const TaxonomyContext = React.createContext<TaxonomyContextData>({
+  toastMessage: null,
+  setToastMessage: null,
+  alertProps: null,
+  setAlertProps: null,
+});
diff --git a/src/taxonomy/data/api.js b/src/taxonomy/data/api.js
index 65c7bd1779..a36cf6d513 100644
--- a/src/taxonomy/data/api.js
+++ b/src/taxonomy/data/api.js
@@ -88,7 +88,7 @@ export const apiUrls = {
 /**
  * Get list of taxonomies.
  * @param {string} [org] Filter the list to only show taxonomies assigned to this org
- * @returns {Promise<import("./types.mjs").TaxonomyListData>}
+ * @returns {Promise<import("./types.js").TaxonomyListData>}
  */
 export async function getTaxonomyListData(org) {
   const { data } = await getAuthenticatedHttpClient().get(apiUrls.taxonomyList(org));
@@ -107,7 +107,7 @@ export async function deleteTaxonomy(taxonomyId) {
 /**
  * Get metadata about a Taxonomy
  * @param {number} taxonomyId The ID of the taxonomy to get
- * @returns {Promise<import("./types.mjs").TaxonomyData>}
+ * @returns {Promise<import("./types.js").TaxonomyData>}
  */
 export async function getTaxonomy(taxonomyId) {
   const { data } = await getAuthenticatedHttpClient().get(apiUrls.taxonomy(taxonomyId));
diff --git a/src/taxonomy/data/apiHooks.js b/src/taxonomy/data/apiHooks.js
index c734ad022d..8b2037d390 100644
--- a/src/taxonomy/data/apiHooks.js
+++ b/src/taxonomy/data/apiHooks.js
@@ -109,7 +109,7 @@ export const useImportNewTaxonomy = () => {
   return useMutation({
     /**
     * @type {import("@tanstack/react-query").MutateFunction<
-    *   import("./types.mjs").TaxonomyData,
+    *   import("./types.js").TaxonomyData,
     *   any,
     *   {
     *     name: string,
@@ -147,7 +147,7 @@ export const useImportTags = () => {
   return useMutation({
     /**
     * @type {import("@tanstack/react-query").MutateFunction<
-    *   import("./types.mjs").TaxonomyData,
+    *   import("./types.js").TaxonomyData,
     *   any,
     *   {
     *     taxonomyId: number,
@@ -202,3 +202,35 @@ export const useImportPlan = (taxonomyId, file) => useQuery({
   },
   retry: false, // If there's an error, it's probably a real problem with the file. Don't try again several times!
 });
+
+/**
+ * @param {number} taxonomyId
+ * @param {import('./types.js').QueryOptions} options
+ * @returns {import('@tanstack/react-query').UseQueryResult<import('./types.js').TagListData>}
+ */
+export const useTagListData = (taxonomyId, options) => {
+  const { pageIndex, pageSize } = options;
+  return useQuery({
+    queryKey: taxonomyQueryKeys.taxonomyTagListPage(taxonomyId, pageIndex, pageSize),
+    queryFn: async () => {
+      const { data } = await getAuthenticatedHttpClient().get(apiUrls.tagList(taxonomyId, pageIndex, pageSize));
+      return camelCaseObject(data);
+    },
+  });
+};
+
+/**
+ * Temporary hook to load *all* the subtags of a given tag in a taxonomy.
+ * Doesn't handle pagination or anything. This is meant to be replaced by
+ * something more sophisticated later, as we improve the "taxonomy details" page.
+ * @param {number} taxonomyId
+ * @param {string} parentTagValue
+ * @returns {import('@tanstack/react-query').UseQueryResult<import('./types.js').TagListData>}
+ */
+export const useSubTags = (taxonomyId, parentTagValue) => useQuery({
+  queryKey: taxonomyQueryKeys.taxonomyTagSubtagsList(taxonomyId, parentTagValue),
+  queryFn: async () => {
+    const response = await getAuthenticatedHttpClient().get(apiUrls.allSubtagsOf(taxonomyId, parentTagValue));
+    return camelCaseObject(response.data);
+  },
+});
diff --git a/src/taxonomy/data/types.mjs b/src/taxonomy/data/types.mjs
deleted file mode 100644
index 4d649404de..0000000000
--- a/src/taxonomy/data/types.mjs
+++ /dev/null
@@ -1,32 +0,0 @@
-// @ts-check
-
-/**
- * @typedef {Object} TaxonomyData Metadata about a taxonomy
- * @property {number} id
- * @property {string} name
- * @property {string} description
- * @property {string} exportId
- * @property {boolean} enabled
- * @property {boolean} allowMultiple
- * @property {boolean} allowFreeText
- * @property {boolean} systemDefined
- * @property {boolean} visibleToAuthors
- * @property {number} tagsCount
- * @property {string[]} orgs
- * @property {boolean} allOrgs
- * @property {boolean} canChangeTaxonomy
- * @property {boolean} canDeleteTaxonomy
- * @property {boolean} canTagObject
- */
-
-/**
- * @typedef {Object} TaxonomyListData The list of taxonomies
- * @property {string} next
- * @property {string} previous
- * @property {number} count
- * @property {number} numPages
- * @property {number} currentPage
- * @property {number} start
- * @property {boolean} canAddTaxonomy
- * @property {TaxonomyData[]} results
- */
diff --git a/src/taxonomy/data/types.ts b/src/taxonomy/data/types.ts
new file mode 100644
index 0000000000..dbc7186031
--- /dev/null
+++ b/src/taxonomy/data/types.ts
@@ -0,0 +1,60 @@
+/** Metadata about a taxonomy */
+export interface TaxonomyData {
+  id: number;
+  name: string;
+  description: string;
+  exportId: string;
+  enabled: boolean;
+  allowMultiple: boolean;
+  allowFreeText: boolean;
+  systemDefined: boolean;
+  visibleToAuthors: boolean;
+  tagsCount: number;
+  orgs: string[];
+  allOrgs: boolean;
+  canChangeTaxonomy: boolean;
+  canDeleteTaxonomy: boolean;
+  canTagObject: boolean;
+}
+
+/** The list of taxonomies */
+export interface TaxonomyListData {
+  next: string;
+  previous: string;
+  count: number;
+  numPages: number;
+  currentPage: number;
+  start: number;
+  canAddTaxonomy: boolean;
+  results: TaxonomyData[];
+}
+
+export interface QueryOptions {
+  pageIndex: number;
+  pageSize: number;
+}
+
+export interface TagData {
+  childCount: number;
+  descendantCount: number;
+  depth: number;
+  externalId: string;
+  id: number;
+  parentValue: string | null;
+  subTagsUrl: string | null;
+  /** Unique ID for this tag, also its display text */
+  value: string;
+  usageCount?: number;
+  /** Database ID. Don't rely on this, as it is not present for free-text tags. */
+  _id?: string;
+}
+
+export interface TagListData {
+  count: number;
+  currentPage: number;
+  next: string;
+  numPages: number;
+  previous: string;
+  results: TagData[];
+  start: number;
+}
diff --git a/src/taxonomy/tag-list/TagListTable.jsx b/src/taxonomy/tag-list/TagListTable.jsx
index 486543aebc..013fcb6530 100644
--- a/src/taxonomy/tag-list/TagListTable.jsx
+++ b/src/taxonomy/tag-list/TagListTable.jsx
@@ -7,7 +7,7 @@ import Proptypes from 'prop-types';
 
 import { LoadingSpinner } from '../../generic/Loading';
 import messages from './messages';
-import { useTagListData, useSubTags } from './data/apiHooks';
+import { useTagListData, useSubTags } from '../data/apiHooks';
 
 const SubTagsExpanded = ({ taxonomyId, parentTagValue }) => {
   const subTagsData = useSubTags(taxonomyId, parentTagValue);
diff --git a/src/taxonomy/tag-list/data/apiHooks.js b/src/taxonomy/tag-list/data/apiHooks.js
deleted file mode 100644
index 60043f4e8b..0000000000
--- a/src/taxonomy/tag-list/data/apiHooks.js
+++ /dev/null
@@ -1,41 +0,0 @@
-// @ts-check
-
-// TODO: this file needs to be merged into src/taxonomy/data/apiHooks.js
-
-import { useQuery } from '@tanstack/react-query';
-import { camelCaseObject } from '@edx/frontend-platform';
-import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
-import { apiUrls } from '../../data/api';
-import { taxonomyQueryKeys } from '../../data/apiHooks';
-
-/**
- * @param {number} taxonomyId
- * @param {import('./types.mjs').QueryOptions} options
- * @returns {import('@tanstack/react-query').UseQueryResult<import('./types.mjs').TagListData>}
- */
-export const useTagListData = (taxonomyId, options) => {
-  const { pageIndex, pageSize } = options;
-  return useQuery({
-    queryKey: taxonomyQueryKeys.taxonomyTagListPage(taxonomyId, pageIndex, pageSize),
-    queryFn: async () => {
-      const { data } = await getAuthenticatedHttpClient().get(apiUrls.tagList(taxonomyId, pageIndex, pageSize));
-      return camelCaseObject(data);
-    },
-  });
-};
-
-/**
- * Temporary hook to load *all* the subtags of a given tag in a taxonomy.
- * Doesn't handle pagination or anything. This is meant to be replaced by
- * something more sophisticated later, as we improve the "taxonomy details" page.
- * @param {number} taxonomyId
- * @param {string} parentTagValue
- * @returns {import('@tanstack/react-query').UseQueryResult<import('./types.mjs').TagListData>}
- */
-export const useSubTags = (taxonomyId, parentTagValue) => useQuery({
-  queryKey: taxonomyQueryKeys.taxonomyTagSubtagsList(taxonomyId, parentTagValue),
-  queryFn: async () => {
-    const response = await getAuthenticatedHttpClient().get(apiUrls.allSubtagsOf(taxonomyId, parentTagValue));
-    return camelCaseObject(response.data);
-  },
-});
diff --git a/src/taxonomy/tag-list/data/types.mjs b/src/taxonomy/tag-list/data/types.mjs
deleted file mode 100644
index 8998e609ef..0000000000
--- a/src/taxonomy/tag-list/data/types.mjs
+++ /dev/null
@@ -1,36 +0,0 @@
-// @ts-check
-
-// TODO: this file needs to be merged into src/taxonomy/data/types.mjs
-// We are creating a mess with so many different /data/[api|types].js files in subfolders.
-// There is only one tagging/taxonomy API, and it should be implemented via a single types.mjs and api.js file.
-
-/**
- * @typedef {Object} QueryOptions
- * @property {number} pageIndex
- * @property {number} pageSize
- */
-
-/**
- * @typedef {Object} TagData
- * @property {number} childCount
- * @property {number} descendantCount
- * @property {number} depth
- * @property {string} externalId
- * @property {number} id
- * @property {string | null} parentValue
- * @property {string | null} subTagsUrl
- * @property {string} value Unique ID for this tag, also its display text
- * @property {number?} usageCount
- * @property {string?} _id Database ID. Don't rely on this, as it is not present for free-text tags.
- */
-
-/**
- * @typedef {Object} TagListData
- * @property {number} count
- * @property {number} currentPage
- * @property {string} next
- * @property {number} numPages
- * @property {string} previous
- * @property {TagData[]} results
- * @property {number} start
- */
diff --git a/src/taxonomy/tag-list/index.js b/src/taxonomy/tag-list/index.ts
similarity index 100%
rename from src/taxonomy/tag-list/index.js
rename to src/taxonomy/tag-list/index.ts
diff --git a/src/taxonomy/tag-list/messages.js b/src/taxonomy/tag-list/messages.ts
similarity index 100%
rename from src/taxonomy/tag-list/messages.js
rename to src/taxonomy/tag-list/messages.ts
diff --git a/src/taxonomy/taxonomy-menu/TaxonomyMenu.jsx b/src/taxonomy/taxonomy-menu/TaxonomyMenu.jsx
index 576cf5d8ff..fce069a95d 100644
--- a/src/taxonomy/taxonomy-menu/TaxonomyMenu.jsx
+++ b/src/taxonomy/taxonomy-menu/TaxonomyMenu.jsx
@@ -21,7 +21,7 @@ import { ImportTagsWizard } from '../import-tags';
 import { ManageOrgsModal } from '../manage-orgs';
 import messages from './messages';
 
-/** @typedef {import('../data/types.mjs').TaxonomyData} TaxonomyData */
+/** @typedef {import('../data/types.js').TaxonomyData} TaxonomyData */
 // Note: to make mocking easier for tests, the types below only specify the subset of TaxonomyData that we actually use.
 
 /**