fix(ios): update to core-js 3

This is to fix a bug where the toStringTag property of a TypedArray was not able to be accessed and led to a crash on startup on iOS 9

Fixes TIMOB-27484

build/lib/builder.js

@@ -10,7 +10,6 @@ const commonjs = require('rollup-plugin-commonjs');
 
 const git = require('./git');
 const utils = require('./utils');
-const copyPackageAndDependencies = utils.copyPackageAndDependencies;
 const Packager = require('./packager');
 
 const ROOT_DIR = path.join(__dirname, '..', '..');
@@ -39,8 +38,8 @@ function determineBabelOptions(babelOptions) {
 		...babelOptions,
 		useBuiltIns: 'entry',
 		// DO NOT include web polyfills!
-		exclude: [ 'web.dom.iterable', 'web.immediate', 'web.timers' ],
-		corejs: 2
+		exclude: [ 'web.dom-collections.iterator', 'web.dom-collections.for-each', 'web.immediate', 'web.timers' ],
+		corejs: 3
 	};
 
 	return {
@@ -113,13 +112,6 @@ class Builder {
 		console.log(`Creating temporary 'common' directory...`); // eslint-disable-line quotes
 		await fs.copy(path.join(ROOT_DIR, 'common'), TMP_COMMON_PLAFORM_DIR);
 
-		// copy over polyfill and its dependencies
-		console.log('Copying polyfills...');
-		const modulesDir = path.join(TMP_COMMON_PLAFORM_DIR, 'Resources/node_modules');
-		// make sure our 'node_modules' directory exists
-		await fs.ensureDir(modulesDir);
-		copyPackageAndDependencies('@babel/polyfill', modulesDir);
-
 		// create a bundle
 		console.log('Transpile and run rollup...');
 		const bundle = await rollup({

common/Resources/ti.main.js

@@ -23,7 +23,9 @@ try {
 }
 
 // Load JS language polyfills
-import '@babel/polyfill';
+import 'core-js/stable';
+// Load polyfill for async/await usage
+import 'regenerator-runtime/runtime';
 // import all of our polyfills/extensions
 import './ti.internal/extensions';
 

package.json

@@ -124,7 +124,7 @@
     "commander": "^3.0.1",
     "commitizen": "^4.0.3",
     "conventional-changelog-cli": "^2.0.25",
-    "core-js": "^2.6.5",
+    "core-js": "^3.3.2",
     "cz-conventional-changelog": "^3.0.2",
     "danger": "^9.2.4",
     "dateformat": "^3.0.3",