docs: function MemoryAdapter(initialFiles) {
      if (!(this instanceof MemoryAdapter)) {
          return new MemoryAdapter(initialFiles);
      }
  
      this.entries = new Map();
  
      // load initial file buffers
      if (typeof initialFiles === "object" && initialFiles) {
          Object.keys(initialFiles).forEach((fileName) => {
              const buf = Buffer.from(initialFiles[fileName]);
              this.entries.set(fileName, buf);
          });
      }
  }