# Constants

Import these from `@grafloria/engine`.

## Constants

### `AUTO_LAYOUT_NAME`

The registered name of the auto-selecting layout.

```ts
const AUTO_LAYOUT_NAME: "auto"
```

### `BAKEOFF_NODE_LIMIT`

Above this many nodes the bake-off itself is the pathology: it runs EVERY
candidate engine on the full graph, so its runtime is the SUM of the field —
including whichever engine happens to hang at that scale (measured: 16s+ at
300 nodes, unbounded at 2,000). Past this limit the graph is classified
structurally and ONE engine is picked directly; the choice is still
deterministic and still explained in the selection report.

```ts
const BAKEOFF_NODE_LIMIT: 200
```

### `DEFAULT_LAYOUT_NAME`

The layout `engine.layout()` runs when the caller names none.

This is `'auto'`, not a fixed algorithm. A zero-config caller
gets a bake-off (see layout-auto-select.ts) rather than whichever algorithm
happened to be hard-coded, and can read back WHY it chose what it chose. Naming
it here rather than inline in DiagramEngine keeps the decision in one place —
a card that wants a different default (a Sugiyama, say) changes this constant
and nothing else.

```ts
const DEFAULT_LAYOUT_NAME: "auto"
```

### `DEFAULT_LAYOUT_SEED`

The seed used when a caller asks for a layout without naming one.

A FIXED default (not a time-derived one) is the whole point: an author who
never thinks about seeds still gets the same picture every time they open
their diagram. Randomness is opt-in, by passing a different seed.

```ts
const DEFAULT_LAYOUT_SEED: 24301
```

### `DEFAULT_NODE_HEIGHT`

```ts
const DEFAULT_NODE_HEIGHT: 50
```

### `DEFAULT_NODE_WIDTH`

Dagre's fallbacks, reused so every layout agrees on what an unsized node is.

```ts
const DEFAULT_NODE_WIDTH: 150
```

### `layoutService`

Singleton instance of LayoutService

Can be used across the application for convenience.

```ts
const layoutService: LayoutService
```