Migrated to Typescript a file which is imported in JS files

package-lock.json

@@ -2265,6 +2265,15 @@
       "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
       "dev": true
     },
+    "@types/moment": {
+      "version": "2.13.0",
+      "resolved": "https://registry.npmjs.org/@types/moment/-/moment-2.13.0.tgz",
+      "integrity": "sha1-YE69GJvDvDShVIaJQE5hoqSqyJY=",
+      "dev": true,
+      "requires": {
+        "moment": "*"
+      }
+    },
     "@types/node": {
       "version": "12.7.11",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.11.tgz",

package.json

@@ -75,6 +75,7 @@
     "@svgr/webpack": "^4.3.3",
     "@types/enzyme": "^3.10.5",
     "@types/jest": "^26.0.10",
+    "@types/moment": "^2.13.0",
     "@types/ramda": "^0.27.14",
     "@types/react": "^16.9.46",
     "@types/react-dom": "^16.9.8",

src/utils/helpers/date.js

@@ -1,3 +0,0 @@
-export const formatDate = (format = 'YYYY-MM-DD') => (date) => date && date.format ? date.format(format) : date;
-
-export const formatIsoDate = (date) => date && date.format ? date.format() : date;

src/utils/helpers/date.ts

@@ -0,0 +1,13 @@
+import * as moment from 'moment';
+
+type MomentOrString = moment.Moment | string;
+type NullableDate = MomentOrString | null;
+
+const isMomentObject = (date: moment.Moment | string): date is moment.Moment => typeof (date as moment.Moment).format === 'function';
+
+const formatDateFromFormat = (date?: NullableDate, format?: string): NullableDate | undefined =>
+  !date || !isMomentObject(date) ? date : date.format(format);
+
+export const formatDate = (format = 'YYYY-MM-DD') => (date?: NullableDate) => formatDateFromFormat(date, format);
+
+export const formatIsoDate = (date: NullableDate) => formatDateFromFormat(date, undefined);

test/utils/helpers/date.test.js

@@ -0,0 +1,30 @@
+import moment from 'moment';
+import { formatDate, formatIsoDate } from '../../../src/utils/helpers/date';
+
+describe('date', () => {
+  describe('formatDate', () => {
+    it.each([
+      [ moment('2020-03-05 10:00:10'), 'DD/MM/YYYY', '05/03/2020' ],
+      [ moment('2020-03-05 10:00:10'), 'YYYY-MM', '2020-03' ],
+      [ moment('2020-03-05 10:00:10'), undefined, '2020-03-05' ],
+      [ '2020-03-05 10:00:10', 'DD-MM-YYYY', '2020-03-05 10:00:10' ],
+      [ '2020-03-05 10:00:10', undefined, '2020-03-05 10:00:10' ],
+      [ undefined, undefined, undefined ],
+      [ null, undefined, null ],
+    ])('formats date as expected', (date, format, expected) => {
+      expect(formatDate(format)(date)).toEqual(expected);
+    });
+  });
+
+  describe('formatIsoDate', () => {
+    it.each([
+      [ moment('2020-03-05 10:00:10'), moment('2020-03-05 10:00:10').format() ],
+      [ '2020-03-05 10:00:10', '2020-03-05 10:00:10' ],
+      [ 'foo', 'foo' ],
+      [ undefined, undefined ],
+      [ null, null ],
+    ])('formats date as expected', (date, expected) => {
+      expect(formatIsoDate(date)).toEqual(expected);
+    });
+  });
+});