Function decode

github-actions/browserstack/set-browserstack-env.js:15414–15424

(ioQueue, encoding)

        switch (type) {
          case "DataURL": {
            let dataURL = "data:";
            const parsed = parseMIMEType(mimeType || "application/octet-stream");
            if (parsed !== "failure") {
              dataURL += serializeAMimeType(parsed);
            }
            dataURL += ";base64,";
            const decoder = new StringDecoder2("latin1");
            for (const chunk of bytes) {
              dataURL += btoa(decoder.write(chunk));
            }
            dataURL += btoa(decoder.end());
            return dataURL;
          }
          case "Text": {