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whippy-edition/app/javascript/mastodon/polyfills/base_polyfills.ts

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2023-05-09 21:55:35 +09:00
import 'core-js/features/object/assign';
import 'core-js/features/object/values';
import 'core-js/features/symbol';
import 'core-js/features/promise/finally';
import { decode as decodeBase64 } from '../utils/base64';
if (!Object.hasOwn(HTMLCanvasElement.prototype, 'toBlob')) {
const BASE64_MARKER = ';base64,';
Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
value: function (
this: HTMLCanvasElement,
callback: BlobCallback,
type = 'image/png',
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quality: unknown,
) {
const dataURL: string = this.toDataURL(type, quality);
let data;
if (dataURL.includes(BASE64_MARKER)) {
const [, base64] = dataURL.split(BASE64_MARKER);
data = decodeBase64(base64);
} else {
[, data] = dataURL.split(',');
}
callback(new Blob([data], { type }));
},
});
}