Interface: NodeDef

A container node: areas coexist (AND), tabs exclude (at most one shown), modals overlay.

THE DEEPEST-NODE RULE, said once here and repeated on each bucket below: Sync pages; observe the deeper place. sync() moves the walker and decides what is served; observeFocus() says which tab or area the reader is in. Declare containers, and report the deepest one on screen. Declaring a container without ever observing it gives you mount-tracking but not position: the containers are real nodes, and session.observeFocus('page.tab') is what puts the reader inside one. sync() cannot — actions are served from the PAGE, so a cursor on a tab would be served nothing.

Extended by

Properties

actions?

optional actions?: Record<string, ActionDef>

Defined in: src/tree/types.ts:301

The controls on this node.

areas?

optional areas?: Record<string, NodeDef>

Defined in: src/tree/types.ts:265

Sibling regions that coexist — a sidebar and a detail pane are both here.

Declaring a container without ever observing it gives you mount-tracking but not position — see the deepest-node rule on NodeDef.

does?

optional does?: string

Defined in: src/tree/types.ts:256

Optional authored description of the container itself.

instances?

optional instances?: (state) => string[]

Defined in: src/tree/types.ts:299

L2 existence source for a repeats container: the COMPLETE instance set, from projected state (order #57 exists while scrolled out of view). Without it, served instance lists fall back to the mounted window — honestly marked enumeration:'mounted-window'.

Parameters

state

Record<string, unknown>

Returns

string[]

modals?

optional modals?: Record<string, ModalDef>

Defined in: src/tree/types.ts:290

Overlays. A shown blocking modal masks sibling actions (blocks: false opts a popover out), and a modal is NEVER assumed active: closed until registered or shown.

Declaring a container without ever observing it gives you mount-tracking but not position — see the deepest-node rule on NodeDef. For a modal the order matters: show() opens it, and an observeFocus() naming a modal nobody opened resolves to the page, because a closed modal cannot hold anyone.

repeats?

optional repeats?: boolean

Defined in: src/tree/types.ts:292

Template container: instances carry runtime keys (order cards, product tiles).

tabs?

optional tabs?: Record<string, NodeDef>

Defined in: src/tree/types.ts:278

An exclusivity PRIOR: at most one of these is shown. Not a statechart — no transitions, no initial, no history.

Declaring a container without ever observing it gives you mount-tracking but not position — see the deepest-node rule on NodeDef. Tabs are where that bites hardest: the whole point of the bucket is that ONE of them is where the reader is, and nothing but evidence can say which — and a person clicking a tab fires nothing, so only an observation can carry it. session.show('page.tab') says which tab is VISIBLE; session.observeFocus('page.tab') says the reader is IN it.

when?

optional when?: WhereFilter<Record<string, unknown>>

Defined in: src/tree/types.ts:258

Container guard: every descendant action's guard is AND-narrowed by this.

NodeDef

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