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Add OPFSWriteAheadVFS documentation#400

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mintlify/opfs-writeahead-vfs-1776678728
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Add OPFSWriteAheadVFS documentation#400
mintlify[bot] wants to merge 1 commit intomainfrom
mintlify/opfs-writeahead-vfs-1776678728

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@mintlify mintlify Bot commented Apr 20, 2026

Summary

  • Documents the new OPFSWriteAheadVFS virtual file system option for the Web SDK, which uses OPFS with a write-ahead log to support concurrent reads
  • Adds configuration example showing how to set VFS type and additionalReaders option
  • Updates the VFS compatibility matrix with a new "Concurrent Reads" column

What shipped

The @powersync/web SDK added WASQLiteVFS.OPFSWriteAheadVFS, a new VFS backed by OPFS with write-ahead logging. It is the only VFS that supports opening multiple SQLite connections, enabling one writer and configurable additional read-only connections for parallel query execution.

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