one more #1161 workaround, for the pure version export context case

Author: zloirock

packages/core-js-pure/override/internals/export.js

@@ -70,7 +70,7 @@ module.exports = function (options, source) {
 
     if (USE_NATIVE && typeof targetProperty == typeof sourceProperty) continue;
 
-    // bind timers to global for call from export context
+    // bind methods to global for calling from export context
     if (options.bind && USE_NATIVE) resultProperty = bind(sourceProperty, global);
     // wrap global constructors for prevent changs in this version
     else if (options.wrap && USE_NATIVE) resultProperty = wrapConstructor(sourceProperty);

packages/core-js/modules/web.atob.js

@@ -35,7 +35,7 @@ var WRONG_ARITY = !NO_SPACES_IGNORE && !NO_ENCODING_CHECK && $atob.length !== 1;
 
 // `atob` method
 // https://html.spec.whatwg.org/multipage/webappapis.html#dom-atob
-$({ global: true, enumerable: true, forced: NO_SPACES_IGNORE || NO_ENCODING_CHECK || NO_ARG_RECEIVING_CHECK || WRONG_ARITY }, {
+$({ global: true, bind: true, enumerable: true, forced: NO_SPACES_IGNORE || NO_ENCODING_CHECK || NO_ARG_RECEIVING_CHECK || WRONG_ARITY }, {
   atob: function atob(data) {
     validateArgumentsLength(arguments.length, 1);
     // `webpack` dev server bug on IE global methods - use call(fn, global, ...)

packages/core-js/modules/web.btoa.js

@@ -24,7 +24,7 @@ var WRONG_ARITY = !!$btoa && $btoa.length !== 1;
 
 // `btoa` method
 // https://html.spec.whatwg.org/multipage/webappapis.html#dom-btoa
-$({ global: true, enumerable: true, forced: NO_ARG_RECEIVING_CHECK || WRONG_ARG_CONVERSION || WRONG_ARITY }, {
+$({ global: true, bind: true, enumerable: true, forced: NO_ARG_RECEIVING_CHECK || WRONG_ARG_CONVERSION || WRONG_ARITY }, {
   btoa: function btoa(data) {
     validateArgumentsLength(arguments.length, 1);
     // `webpack` dev server bug on IE global methods - use call(fn, global, ...)