Function fireAProgressEvent

github-actions/browserstack/set-browserstack-env.js:15360–15366

(e, reader)

              if (!done && types.isUint8Array(value)) {
                bytes.push(value);
                if ((fr[kLastProgressEventFired] === void 0 || Date.now() - fr[kLastProgressEventFired] >= 50) && !fr[kAborted]) {
                  fr[kLastProgressEventFired] = Date.now();
                  queueMicrotask(() => {
                    fireAProgressEvent("progress", fr);
                  });
                }
                chunkPromise = reader.read();
              } else if (done) {
                queueMicrotask(() => {
                  fr[kState] = "done";