fix: ensure that NumberFormat.formatToParts is available (#5)

* chore: upgrade deps

* fix: ensure that NumberFormat.formatToParts is available

IE 11 and Edge < 18 support `Intl.NumberFormat`, but not the `Intl.NumberFormat.formatToParts` API.

* chore: rename master branch to main

CONTRIBUTING.md

@@ -21,11 +21,11 @@ If you feel another member of the community violated our CoC or you are experien
 ### Submitting a PR
 
 1. Find an existing issue to work on or follow `Submitting an issue` to create one that you're also going to fix. Make sure to notify that you're working on a fix for the issue you picked.
-2. Branch out from latest `master`.
+2. Branch out from latest `main`.
 3. Code, add, commit and push your changes in your branch.
 4. Make sure that tests and linter(s) pass locally for you.
 5. Submit a PR.
-6. Collaborate with the codeowners/reviewers to merge this in `master`.
+6. Collaborate with the codeowners/reviewers to merge this in `main`.
 
 ## Common commands
 

README.md

@@ -2,7 +2,7 @@
 
 # Intl.js
 
-[![Coverage](https://img.shields.io/codecov/c/github/sumup-oss/intl-js)](https://codecov.io/gh/sumup-oss/intl-js) [![License](https://img.shields.io/github/license/sumup-oss/intl-js)](https://github.com/sumup-oss/intl-js/blob/master/LICENSE)
+[![Coverage](https://img.shields.io/codecov/c/github/sumup-oss/intl-js)](https://codecov.io/gh/sumup-oss/intl-js) [![License](https://img.shields.io/github/license/sumup-oss/intl-js)](https://github.com/sumup-oss/intl-js/blob/main/LICENSE)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-v1.4%20adopted-ff69b4.svg)](CODE_OF_CONDUCT.md)
 
 Format 🔢 numbers and 💱currency values for any locale with the [ECMAScript Internationalization API](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl).
@@ -324,7 +324,7 @@ const isIntlSupported: boolean;
 
 #### `CURRENCIES`
 
-An object that maps a 2 char country code to its official 3 char currency code. [View all supported countries](https://github.com/sumup-oss/intl-js/blob/master/src/data/currencies.ts).
+An object that maps a 2 char country code to its official 3 char currency code. [View all supported countries](https://github.com/sumup-oss/intl-js/blob/main/src/data/currencies.ts).
 
 ```ts
 const CURRENCIES: { [country: string]: string };

package.json

@@ -43,14 +43,14 @@
     "intl-format-cache": "^4.2.27"
   },
   "devDependencies": {
-    "@sumup/foundry": "^2.2.0",
+    "@sumup/foundry": "^3.0.0",
     "@types/jest": "^25.2.0",
     "audit-ci": "^3.0.0",
     "jest": "^26.0.0",
     "jest-extended": "^0.11.4",
     "jest-junit": "^10.0.0",
     "license-checker": "^25.0.1",
-    "ts-jest": "^25.0.0",
+    "ts-jest": "^26.0.0",
     "typescript": "^3.7.5"
   }
 }

src/base.ts

@@ -44,7 +44,10 @@ export function formatToPartsFactory<T extends Args>(
     locales?: Locale | Locale[],
     ...args: T
   ): Intl.NumberFormatPart[] => {
-    if (!isIntlSupported) {
+    if (
+      !isIntlSupported ||
+      typeof Intl.NumberFormat.prototype.formatToParts === 'undefined'
+    ) {
       return [{ type: 'integer', value: value.toString() }];
     }
 

src/data/currencies.ts

@@ -17,7 +17,7 @@ import { Currency } from '../types';
 
 /**
  * An object that maps a 2 char country code to its official 3 char currency code.
- * [View all supported countries](https://github.com/sumup-oss/intl-js/blob/master/src/data/currencies.ts).
+ * [View all supported countries](https://github.com/sumup-oss/intl-js/blob/main/src/data/currencies.ts).
  */
 export const CURRENCIES: { [country: string]: Currency } = {
   // Andorra