Method processEvent

github-actions/browserstack/set-browserstack-env.js:18874–18891

* @param {EventSourceStreamEvent} event

(event)

         * @param {Buffer} chunk
         * @param {string} _encoding
         * @param {Function} callback
         * @returns {void}
         */
        _transform(chunk, _encoding, callback) {
          if (chunk.length === 0) {
            callback();
            return;
          }
          this.chunks.push(chunk);
          if (this.checkBOM) {
            if (this.handleBOM()) {
              callback();
              return;
            }
          }
          while (this.hasCurrentByte()) {
            const byte = this.currentByte();
            if (this.eventEndCheck) {
              if (this.crlfCheck) {
                if (byte === LF) {
                  this.crlfCheck = false;