automerge-repo-storage-browserfs

An Automerge Repo Storage adapter for using a Directory of the browser's File System API as storage.

it uses the same speedy optimized filesystem layout as Automerge's own nodefs adapter, and is tested against the same storage adapter tests as the adapters that come with automerge-repo in Chromium and Firefox.

usage

pnpm add automerge-repo-storage-browser-file-system

import {BrowserWebSocketClientAdapter} from "@automerge/automerge-repo-network-websocket"
import BrowserFileSystemAdapter from "automerge-repo-storage-browser-file-system"
import {Repo} from "@automerge/automerge-repo"

export default async function startAutomerge() {
	const repo = new Repo({
		storage: new BrowserFileSystemAdapter("automerge"), // or pass a FileSystemDirectoryHandle
		network: [new BrowserWebSocketClientAdapter("wss://sync.automerge.org")],
	})
	return repo
}

for general info on automerge repo, see the fabulous automerge website

browser differences

• In Chromium the directory can provided by the showDirectoryPicker or the Origin private file system's navigator.storage.getDirectory().
• In Firefox only the origin private file system is available.
• In Safari, the main thread cannot write to even the OPFS. If you'd like to submit a Pull Request that uses a Web Worker to perform the rights in safari, i would like to read it.

weaknesses and drawbacks

because of a missing API in Safari's implementation of the Origin private file system, this storage mechanism does not currently work in Safari. there appears to be no indication that they will ever add support for it, but who knows.

perhaps you would find it enjoyable to submit a pull request that uses a WebWorker to do the writing in Safari?