Glossary

Action. A named function of a page, component or store, whose body does things: action add() { … }. Chapter 8.

App shell. The app { } declaration: what every page renders inside, with a Router where the page goes. Chapter 6.

Block. The { … } after an element: its style, handlers, slot fills and children, in that order. Chapter 7.

Built-in. An element the language provides, such as Button or Card, known to the compiler through the registry. Components.

Case. One value of an enum, written with a dot: .primary, .failed("x"). Chapter 13.

Chunk. A page's own script and stylesheet, written separately and loaded when its route first shows (build.split).

Component. An element you declare, with typed props, events, slots and parts: component UserCard(…) { … }. Chapter 11.

Declaration. A top-level statement of a file: page, component, store, theme, app, type, enum, api, external, const, data, image, animation or test. Chapter 5.

Derived. A value computed from state, recomputed when what it read changes: derived total = ….

Design token. A named value a theme sets and every built-in reads, written $name in a style. Chapter 41.

Effect. Code that runs when a page shows and again when a state it read changes, with a cleanup { } for what it set up.

Flag. A word after a dot that sets a Bool prop or picks an enum case: Button("Save").primary.lg. Chapter 7.

Handler. on click { … } — code run when an event happens. Chapter 9.

Hydration. The script taking over a pre-rendered page in place, without drawing it again. Chapter 26.

Imperative block. The body of an action, handler or effect: statements that do things. Its opposite is a render block.

Part. A sub-element called under its owner's name: Card.Header, Panel.Footer. Chapter 11.

Persist. A state kept in the browser's storage across visits. Chapter 12.

Positional argument. The one value an element takes without a name — a button's label, a heading's text.

Registry. The compiler's table of every built-in's props, cases, flags, events, slots and parts; the checker, the linters, the editor and the reference all read it. wf registry --json prints it.

Render block. The body of a page, component or element: what to show, and the state behind it.

Resource. A request a page makes and a match shows: resource rows = …. Chapter 17.

Runtime. The JavaScript at the head of app.js that compiled pages call, reachable as window.WF. Chapter 42.

Scope. What owns the effects, timers and connections created inside it — a page, a branch, a list item — and disposes of them when it leaves.

Signal. A reactive value: what state is. Whatever reads it follows it.

Slot. A place in a component its caller fills: the default slot (children), a named slot, or a scoped slot that hands values to its fill. Chapter 11.

Static paint. The HTML the build pre-renders for a page, from everything it can know at build time. Chapter 26.

Store. Shared state with actions, built the first time something reads it. Chapter 12.

Theme. A theme declaration: the design tokens it changes. Chapter 15.

.wfx. A source file whose blocks are written by indentation instead of braces. Chapter 5.