A library file is cached by its length and modification time. File systems keep the time in coarse ticks, so a same-length rewrite right after a read can keep the stamp, and library.updates then reports no change. A stamp now proves the file unchanged only once its modification time lies at least two seconds before the read; otherwise the file is read again.
A .fig import now links the layers of an instance to the layers of the
component they came from by the ids the file stores, instead of leaving it to
the engine to guess from names and places. Renamed slots and layers, siblings
that share a name and swapped mains keep their source link and the override
they carry.
Components that live only on the file's hidden internal pages (cached copies of
library components) are kept in the hidden library store when a visible layer
uses them, so their instances stay instances. The read-only guard for library
copies now compares the copies themselves rather than the dirty set, which an
import leaves full until the first edit.
Rebasing an instance (after detaching an outer instance or restoring a main)
follows the source chain inside the right enclosing instance, so contextual
links survive it. The last change of a GUID wins and a removed change deletes
it. Ordinary file JSON never reads the private provenance.
Importing such a file into an open document, or pasting its layers into another one, copies the cached components along (import) or leaves them behind as a missing main (paste), so no link points at a layer of the target.
- Publish (`library.publish {description?, include?, exclude?}`, Libraries > Publish library…):
the file's components, component sets and styles (by default all but names starting with `.` or
`_`, or what the last publish offered) and every component and style they use go into a snapshot
with a manifest (library id, version, per-asset version stamps). An asset keeps the version it
last changed in; publishing without changes is refused.
- .figcraft: `library/manifest.json`, `library/document.json` (the snapshot) and
`library/images/<sha256>` for images only the library still uses. Older files and readers are
unaffected (extra members); a damaged library is skipped and reported when the author's file
opens. Files using a library read only these members (size-limited), never unpublished edits.
- Version history: the library entries are written and read alongside the versions (a library
survives saving with versions and reopening); restoring a version keeps what the file published.
- Enable: `library.add {path}` / `library.remove {id}` / `library.list {assets?}`; the document
keeps its enabled libraries (id, name, path, last seen version) in its data. The session caches
each library file and reads it again when it changes on disk; in the browser these commands
return a clear error (no file system).
- Use: `library.place {library, component, x?, y?}` / `library.import` copy the component (with
the components and styles it uses) into a hidden library store (a page-like root outside the
page list) as read-only main components and place an instance; instances behave like any other
(overrides, properties, variants, swap, reset, detach). `library.applyStyle` copies a style in as
a linked remote style. Editing the copies or library styles is refused; Go to main component
names the library. Importing a file's pages brings its library copies along (shared with copies
the document already has).
- Updates: `library.updates` and `library.acceptUpdates {ids?}` re-import changed copies in place
(layer ids kept, so instance overrides survive, also when layers are added); unused copies are
dropped when a library is removed or updated.
- Assets panel: each enabled library's components (thumbnails, search, click or drag to place,
shared with the local tile code) and styles (click to apply, paint swatches), collapsible per
library; "Library updates available" banner with Update; a libraries view (book button,
Libraries menu) to publish this file (choose assets, description) and add or remove library
files. Local styles in the panels list only this file's styles.
- Tests: manifest round trip and versions, add/place/update keeping overrides (incl. a structural
update), variants/swap/undo, library styles and importing pages, missing/corrupt/truncated/
oversized/never-published files; format tests for damaged and oversized members.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
bflatastic