fix(core): add bootstrap.js to handle special conditions (IE11)

- RegExp sticky flag support
- fix missing Symbol.toStringTag on typed array prototype

Author: FranckFreiburger

build/webpack.config.js

@@ -93,6 +93,7 @@ const configure = ({name, vueTarget, libraryTargetModule}) => (env = {}, { mode
 		},
 
 		entry: [
+			Path.resolve(__dirname, '../src/bootstrap.js'),
 			Path.resolve(__dirname, '../src/index.ts'),
 		],
 

src/bootstrap.js

@@ -0,0 +1,67 @@
+// 1/
+
+// add sticky flag support
+const original_RegExp = global.RegExp;
+
+class PolyfilledRegExp extends global.RegExp {
+  constructor(regex, flags = '') {
+    if (flags.indexOf("y") === -1) {
+      return new original_RegExp(regex, flags);
+    }
+    super(regex, flags.replace("y", "g"));
+    Object.defineProperty(this, "sticky", { value: true, readonly: true });
+  }
+
+  test(str) {
+    return !!this.exec(str);
+  }
+
+  exec(str) {
+    const lastIndex = this.lastIndex;
+    const result = super.exec(str);
+    if (!result || result.index !== lastIndex) {
+      this.lastIndex = 0;
+      return null;
+    }
+    return result;
+  }
+}
+
+//RegExp = PolyfilledRegExp;
+global.RegExp = function(regex, flags = '') {
+
+  return new PolyfilledRegExp(regex, flags);
+}
+
+
+// 2/
+//
+// because :
+// - IE11 has typed array
+// - IE11 has no toStringTag symbol on typed array
+// - polyfills is "usage-pure" (no global scope pollution)
+// -> fix missing Symbol.toStringTag on typed array prototype (used by util > is-typed-array)
+//      var arr = new global[typedArray]();
+//      if (!(Symbol.toStringTag in arr)) {
+//        ...
+//
+
+for ( let name of [
+	'Int8Array',
+	'Uint8Array',
+	'Uint8ClampedArray',
+	'Int16Array',
+	'Uint16Array',
+	'Int32Array',
+	'Uint32Array',
+	'Float32Array',
+	'Float64Array',
+	'BigInt64Array',
+	'BigUint64Array'
+] ) {
+
+  if ( global[name] )
+    global[name].prototype[Symbol.toStringTag] = name;
+}
+
+