diff --git a/packages/netlify-cms-core/src/actions/collections.js b/packages/netlify-cms-core/src/actions/collections.js
deleted file mode 100644
index 53cd4ab0..00000000
--- a/packages/netlify-cms-core/src/actions/collections.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import history from 'Routing/history';
-import { getCollectionUrl, getNewEntryUrl } from 'Lib/urlHelper';
-
-export function searchCollections(query, collection) {
-  if (collection) {
-    history.push(`/collections/${collection}/search/${query}`);
-  } else {
-    history.push(`/search/${query}`);
-  }
-}
-
-export function showCollection(collectionName) {
-  history.push(getCollectionUrl(collectionName));
-}
-
-export function createNewEntry(collectionName) {
-  history.push(getNewEntryUrl(collectionName));
-}
diff --git a/packages/netlify-cms-core/src/actions/collections.ts b/packages/netlify-cms-core/src/actions/collections.ts
new file mode 100644
index 00000000..25c51c93
--- /dev/null
+++ b/packages/netlify-cms-core/src/actions/collections.ts
@@ -0,0 +1,18 @@
+import history from '../routing/history';
+import { getCollectionUrl, getNewEntryUrl } from '../lib/urlHelper';
+
+export function searchCollections(query: string, collection: string) {
+  if (collection) {
+    history.push(`/collections/${collection}/search/${query}`);
+  } else {
+    history.push(`/search/${query}`);
+  }
+}
+
+export function showCollection(collectionName: string) {
+  history.push(getCollectionUrl(collectionName));
+}
+
+export function createNewEntry(collectionName: string) {
+  history.push(getNewEntryUrl(collectionName));
+}
diff --git a/packages/netlify-cms-core/src/lib/urlHelper.ts b/packages/netlify-cms-core/src/lib/urlHelper.ts
index f17d3529..9137a964 100644
--- a/packages/netlify-cms-core/src/lib/urlHelper.ts
+++ b/packages/netlify-cms-core/src/lib/urlHelper.ts
@@ -4,15 +4,15 @@ import sanitizeFilename from 'sanitize-filename';
 import { isString, escapeRegExp, flow, partialRight } from 'lodash';
 import { SlugConfig } from '../types/redux';
 
-function getUrl(urlString: string, direct: boolean) {
+function getUrl(urlString: string, direct?: boolean) {
   return `${direct ? '/#' : ''}${urlString}`;
 }
 
-export function getCollectionUrl(collectionName: string, direct: boolean) {
+export function getCollectionUrl(collectionName: string, direct?: boolean) {
   return getUrl(`/collections/${collectionName}`, direct);
 }
 
-export function getNewEntryUrl(collectionName: string, direct: boolean) {
+export function getNewEntryUrl(collectionName: string, direct?: boolean) {
   return getUrl(`/collections/${collectionName}/new`, direct);
 }
 
diff --git a/packages/netlify-cms-core/src/routing/__tests__/history.spec.js b/packages/netlify-cms-core/src/routing/__tests__/history.spec.ts
similarity index 68%
rename from packages/netlify-cms-core/src/routing/__tests__/history.spec.js
rename to packages/netlify-cms-core/src/routing/__tests__/history.spec.ts
index eb18786e..6622edb8 100644
--- a/packages/netlify-cms-core/src/routing/__tests__/history.spec.js
+++ b/packages/netlify-cms-core/src/routing/__tests__/history.spec.ts
@@ -1,20 +1,23 @@
+import { createHashHistory, History } from 'history';
+import { mocked } from 'ts-jest/utils';
+
 jest.mock('history');
 
-describe('history', () => {
-  const { createHashHistory } = require('history');
-  const history = { push: jest.fn(), replace: jest.fn() };
-  createHashHistory.mockReturnValue(history);
+const history = ({ push: jest.fn(), replace: jest.fn() } as unknown) as History;
+const mockedCreateHashHistory = mocked(createHashHistory);
+mockedCreateHashHistory.mockReturnValue(history);
 
+describe('history', () => {
   beforeEach(() => {
     jest.clearAllMocks();
   });
 
   describe('navigateToCollection', () => {
     it('should push route', () => {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
       const { navigateToCollection } = require('../history');
 
       navigateToCollection('posts');
-
       expect(history.push).toHaveBeenCalledTimes(1);
       expect(history.push).toHaveBeenCalledWith('/collections/posts');
     });
@@ -22,10 +25,10 @@ describe('history', () => {
 
   describe('navigateToNewEntry', () => {
     it('should replace route', () => {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
       const { navigateToNewEntry } = require('../history');
 
       navigateToNewEntry('posts');
-
       expect(history.replace).toHaveBeenCalledTimes(1);
       expect(history.replace).toHaveBeenCalledWith('/collections/posts/new');
     });
@@ -33,10 +36,10 @@ describe('history', () => {
 
   describe('navigateToEntry', () => {
     it('should replace route', () => {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
       const { navigateToEntry } = require('../history');
 
       navigateToEntry('posts', 'index');
-
       expect(history.replace).toHaveBeenCalledTimes(1);
       expect(history.replace).toHaveBeenCalledWith('/collections/posts/entries/index');
     });
diff --git a/packages/netlify-cms-core/src/routing/history.js b/packages/netlify-cms-core/src/routing/history.ts
similarity index 58%
rename from packages/netlify-cms-core/src/routing/history.js
rename to packages/netlify-cms-core/src/routing/history.ts
index abc13658..9a2b5db5 100644
--- a/packages/netlify-cms-core/src/routing/history.js
+++ b/packages/netlify-cms-core/src/routing/history.ts
@@ -2,11 +2,11 @@ import { createHashHistory } from 'history';
 
 const history = createHashHistory();
 
-export const navigateToCollection = collectionName =>
+export const navigateToCollection = (collectionName: string) =>
   history.push(`/collections/${collectionName}`);
-export const navigateToNewEntry = collectionName =>
+export const navigateToNewEntry = (collectionName: string) =>
   history.replace(`/collections/${collectionName}/new`);
-export const navigateToEntry = (collectionName, slug) =>
+export const navigateToEntry = (collectionName: string, slug: string) =>
   history.replace(`/collections/${collectionName}/entries/${slug}`);
 
 export default history;