catstodon/app/javascript/mastodon/base_polyfills.js

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import 'intl';
import 'intl/locale-data/jsonp/en';
import 'es6-symbol/implement';
import includes from 'array-includes';
import assign from 'object-assign';
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import values from 'object.values';
import { decode as decodeBase64 } from './utils/base64';
import promiseFinally from 'promise.prototype.finally';
if (!Array.prototype.includes) {
includes.shim();
}
if (!Object.assign) {
Object.assign = assign;
}
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if (!Object.values) {
values.shim();
}
promiseFinally.shim();
if (!HTMLCanvasElement.prototype.toBlob) {
const BASE64_MARKER = ';base64,';
Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
value(callback, type = 'image/png', quality) {
const dataURL = this.toDataURL(type, quality);
let data;
if (dataURL.indexOf(BASE64_MARKER) >= 0) {
const [, base64] = dataURL.split(BASE64_MARKER);
data = decodeBase64(base64);
} else {
[, data] = dataURL.split(',');
}
callback(new Blob([data], { type }));
},
});
}