feat: avoid SharedArrayBuffer until required

Author: snyamathi

support/types.js

@@ -238,10 +238,21 @@ exports.isDataView = isDataView;
 function isSharedArrayBufferToString(value) {
  return ObjectToString(value) === '[object SharedArrayBuffer]';
 }
-isSharedArrayBufferToString.working = (
- typeof SharedArrayBuffer !== 'undefined' &&
- isSharedArrayBufferToString(new SharedArrayBuffer())
-);
+// Avoid invoking SharedArrayBuffer constructor until required, then memoize
+Object.defineProperty(isSharedArrayBufferToString, 'working', {
+ get: (function() {
+ var isWorking;
+ return function () {
+ if (isWorking === undefined) {
+ isWorking = (
+ typeof SharedArrayBuffer !== 'undefined' &&
+ isSharedArrayBufferToString(new SharedArrayBuffer())
+ )
+ }
+ return isWorking;
+ }
+ })()
+});
 function isSharedArrayBuffer(value) {
  if (typeof SharedArrayBuffer === 'undefined') {
  return false;