Changelog • shinysnap

shinysnap (development version)

The README, changelog, vignettes, AGENTS.md, and DESIGN.md now use plainer language, shorter sentences, and clearer explanations (#8).

CRAN release: 2026-09-28

snap_take() saves the inputs currently on the page, the reactiveValues registered with snap_track(), and any values added by snap_on_save() hooks. It leaves out inputs whose UI has been removed, action buttons, passwords, and values that Shiny marks as unserializable. It also respects setBookmarkExclude() and the selection rules in snap_enable(), snap_exclude(), and snap_include().
Snapshots are lists of class shinysnap. Use snap_inputs(), snap_values(), and snap_meta() to inspect them, and snap_diff() to compare them.

Snapshots use JSON, with enough digits to preserve numeric values and extra type information for values such as dates and matrices. A consistent layout makes changes easy to review in version control. snap_serialize() and snap_unserialize() convert snapshots to and from JSON text; snap_write() and snap_read() write and read files.
snap_write(format = "zip") creates a bundle that includes uploaded files. With unsupported = "rds", it can also store R objects that the JSON format does not support. Bundles are checked before extraction. Reading embedded R objects or .rds files requires trust = TRUE.
snap_download_button(), snap_download_handler(), snap_file_input(), and snap_file_restore() add controls for downloading and uploading snapshot files.

snap_restore() restores a snapshot in the current session. It restores tracked values, runs snap_on_restore() hooks, and sends the input values to the browser. Each input receives its value as soon as it is on the page. Shiny’s restoreInput() supplies saved values to dynamic inputs as they are created. Starting another restore cancels the first.
The restore report lists every input as applied, constructed, reapplied, missing, failed, mismatched, or skipped. snap_on_restored() runs code when the restore finishes, and snap_is_restoring() tells you whether a restore is in progress.
snap_restorer() registers a function that converts a saved value into the message an input expects. You can register it for a binding name or an input id. shinysnap includes restorers for shiny, bslib, and shinyMatrix. Use window.shinysnap.registerAdapter() to convert messages in JavaScript.