[No QA] [TS migration] Migrate 'IntlPolyfill' lib to TypeScript

src/libs/IntlPolyfill/index.native.js → src/libs/IntlPolyfill/index.native.ts

@@ -1,15 +1,18 @@
 import polyfillNumberFormat from './polyfillNumberFormat';
 import polyfillListFormat from './polyfillListFormat';
+import IntlPolyfill from './types';
 
 /**
  * Polyfill the Intl API, always performed for native devices.
  */
-export default function polyfill() {
+const intlPolyfill: IntlPolyfill = () => {
     // Native devices require extra polyfills
     require('@formatjs/intl-getcanonicallocales/polyfill');
     require('@formatjs/intl-locale/polyfill');
     require('@formatjs/intl-pluralrules/polyfill');
     require('@formatjs/intl-datetimeformat');
     polyfillNumberFormat();
     polyfillListFormat();
-}
+};
+
+export default intlPolyfill;

src/libs/IntlPolyfill/index.js → src/libs/IntlPolyfill/index.ts

@@ -1,11 +1,13 @@
 import polyfillNumberFormat from './polyfillNumberFormat';
+import IntlPolyfill from './types';
 
 /**
  * Polyfill the Intl API if the ICU version is old.
  * This ensures that the currency data is consistent across platforms and browsers.
  */
-export default function intlPolyfill() {
+const intlPolyfill: IntlPolyfill = () => {
     // Just need to polyfill Intl.NumberFormat for web based platforms
     polyfillNumberFormat();
     require('@formatjs/intl-datetimeformat');
-}
+};
+export default intlPolyfill;

src/libs/IntlPolyfill/polyfillNumberFormat.js → src/libs/IntlPolyfill/polyfillNumberFormat.ts

@@ -3,15 +3,14 @@ import CONST from '../../CONST';
 /**
  * Check if the locale data is as expected on the device.
  * Ensures that the currency data is consistent across devices.
- * @returns {Boolean}
  */
-function hasOldCurrencyData() {
+function hasOldCurrencyData(): boolean {
     return (
         new Intl.NumberFormat(CONST.LOCALES.DEFAULT, {
             style: CONST.POLYFILL_TEST.STYLE,
             currency: CONST.POLYFILL_TEST.CURRENCY,
             currencyDisplay: CONST.POLYFILL_TEST.FORMAT,
-        }).format(CONST.POLYFILL_TEST.SAMPLE_INPUT) !== CONST.POLYFILL_TEST.EXPECTED_OUTPUT
+        }).format(Number(CONST.POLYFILL_TEST.SAMPLE_INPUT)) !== CONST.POLYFILL_TEST.EXPECTED_OUTPUT
     );
 }
 

src/libs/IntlPolyfill/types.ts

@@ -0,0 +1,3 @@
+type IntlPolyfill = () => void;
+
+export default IntlPolyfill;