discourse/app/assets/javascripts/browser-detect.js

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if (!window.WeakMap || !window.Promise || typeof globalThis === "undefined") {
window.unsupportedBrowser = true;
} else {
// Some implementations of `WeakMap.prototype.has` do not accept false
// values and Ember's `isClassicDecorator` sometimes does that (it only
// checks for `null` and `undefined`).
try {
new WeakMap().has(0);
} catch (err) {
window.unsupportedBrowser = true;
}
}