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[api-minor] Only support browsers/environments that have *basic* support for Promise natively

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Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#Browser_compatibility and https://caniuse.com/#feat=promises, all even remotely modern browsers already support *basic* `Promise` functionality natively.

The only reason for keeping the `Promise` polyfill (at all) is to be able to support recent additions to the specification, such as e.g. `finally` and `allSettled`.
Note that this patch will, on its own, remove support for IE 11/Edge (non-Chromium based) in both the general PDF.js library and the default viewer.
This commit is contained in:
Jonas Jenwald 2020-09-06 13:33:31 +02:00
parent 4caa14b4dc
commit 449c7763d5
3 changed files with 6 additions and 5 deletions
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6
src/shared/compatibility.js
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@ -242,14 +242,16 @@ if (
require("core-js/es/typed-array/slice");
})();
// Support: IE, Safari<11, Chrome<63
// Provides support for *recent* additions to the Promise specification,
// however basic Promise support is assumed to be available natively.
// Support: Firefox<71, Safari<13, Chrome<76
(function checkPromise() {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
// The current image decoders are synchronous, hence `Promise` shouldn't
// need to be polyfilled for the IMAGE_DECODERS build target.
return;
}
if (globalThis.Promise && globalThis.Promise.allSettled) {
if (globalThis.Promise.allSettled) {
return;
}
globalThis.Promise = require("core-js/es/promise/index.js");