discussion - feasibility to integrate `https://wicg.github.io/file-system-access/`

a serious limitation of downstream libraries like sql.js is inability to persist largish databases (e.g. 1gb) to local filesystem.

that might finally be overcome with newly proposed https://wicg.github.io/file-system-access (note spec's motivation appears mainly saving data in web-editors and ides).
they have an [experimental demo here](https://googlechromelabs.github.io/text-editor/)

feasibility question - what additional spec read/write features are needed to integrate emscripten with file-system-access?

spec's current read/write capabilities are (from what i gather):
#### read
- await FileSystemHandle.file() // method returns blob/file object

#### write
- await FileSystemWritableFileStream.write(data)
- await FileSystemWritableFileStream.write({ type: "write", data: data })
- await FileSystemWritableFileStream.write({ type: "write", position: position, data: data })
- await FileSystemWritableFileStream.write({ type: "seek", position: position })
- await FileSystemWritableFileStream.write({ type: "truncate", size: size })