The project bundle is the external export/import artifact used by sync, local .webstudio/data.json, project import, transferred asset files, and prebuild. This package owns the assembled bundle schemas, transfer RPC payloads, and bundle compatibility/version helpers.

Domain models such as pages, assets, and serialized builds remain owned by their domain packages and are composed here through schema-only entrypoints. Do not copy those schemas into this package.

Terminology

Project bundle is the authoritative external project artifact. It is used by sync, .webstudio/data.json, project import, transferred asset files, and prebuild.

Data envelope is a serialized single-key object whose key is a versioned Webstudio marker, for example { "@webstudio/instance/v0.1": data }. The envelope identifies the payload version and lets consumers detect malformed Webstudio-owned data before falling back to other formats.

Transfer data is the domain payload inside a data envelope. Examples include InstanceTransferData, InstancesTransferData, and PageTransferData. Transfer data is portable and detached from a project; insertion/import remaps ids and merges it into authoritative project state. Runtime-owned transfer formats live in @webstudio-is/project-build/transfer.

Clipboard data is a UI transport concern. Builder copy/paste may serialize transfer data into a data envelope and place it on the browser clipboard, but runtime and protocol code should name the reusable format as data envelope or transfer data, not clipboard.