| 1 | export function polyfillNeeded(self) {
|
| 2 | if (self.__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL) {
|
| 3 | console.log('__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL=true is set, will force install polyfill');
|
| 4 | return true;
|
| 5 | }
|
| 6 |
|
| 7 | // Note that the "unfetch" minimal fetch polyfill defines fetch() without
|
| 8 | // defining window.Request, and this polyfill need to work on top of unfetch
|
| 9 | // so the below feature detection needs the !self.AbortController part.
|
| 10 | // The Request.prototype check is also needed because Safari versions 11.1.2
|
| 11 | // up to and including 12.1.x has a window.AbortController present but still
|
| 12 | // does NOT correctly implement abortable fetch:
|
| 13 | // https://bugs.webkit.org/show_bug.cgi?id=174980#c2
|
| 14 | return (
|
| 15 | (typeof self.Request === 'function' && !self.Request.prototype.hasOwnProperty('signal')) || !self.AbortController
|
| 16 | );
|
| 17 | }
|