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I think you want an `AssetArchive`
```let assetArchive = new AssetArchive({
    "a": new FileArchive('./a'),
    "b": new FileArchive("./b"),
});```


Thanks Fraser, this is for building a lambda layer from two folders so I ended up building 2 lambda layers because you can’t have `"."` as a key twice…

But I also might give this a try:

```new AssetArchive({
  '.': new FileArchive('./a'),
  'x': new FileArchive('./b/x'),
  'y': new FileArchive('./b/y'),
})```