Local History and Safe Write Restoration Consistency Gap

Direct answer

Restoring a prior Local History revision in WebStorm replaces the current file content outright. It does not merge with, validate against, or overwrite Safe Write backup data, because Safe Write is a write-time atomicity mechanism rather than a persistent revision store. When a Safe Write backup is recovered after an unexpected IDE exit, it typically contains only the last attempted save and omits unsaved edits that Local History may have captured. IDE version variation affects Local History retention limits and storage format, so the overlap between revisions visible across both mechanisms is inconsistent and coincidental.

Established behavior vs. practical uncertainty

The following points reflect well-established IDE architecture and documented behavior:

• Local History restoration is a full-content replacement of the working file.
• Safe Write creates a temporary file in the OS temp directory during save and renames it on success; it does not maintain a browsable archive.
• A recovered Safe Write temp file reflects the last explicit save, while Local History can capture more recent IDE-tracked edits.
• Local History retention is global and not per-project; clearing caches or changing IDE versions can prune history.
• Neither mechanism documents cross-format consistency checks; they operate at different layers without a shared revision index.

Practical uncertainty remains around exact temp-file naming conventions, OS cleanup timing, and version-specific pruning thresholds. Treat Safe Write remnants as transient and potentially corrupted if the crash occurred mid-write.

Verification steps for this case

To confirm the consistency gap in your environment:

1. Open Settings/Preferences | Appearance & Behavior | System Settings | Local History to confirm retention limits and storage path.
2. After a crash, inspect the IDE system directory for Local History data and the OS temp directory for Safe Write remnants.
3. Compare modification timestamps and content between the newest Local History revision and any recovered Safe Write temp file.
4. Reproduce in a test project: enable Safe Write, edit, force-close the IDE, then compare Local History revisions against temp file content.

One detail that changes the recommendation

Which exact WebStorm version and build are you using? Version-specific Local History storage format and retention rules determine whether older revisions remain visible after an upgrade or cache clear, which changes the recovery path.