# `SceneSpec.rules`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `configurator-runtime.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`SceneSpec`](SceneSpec.md) · stable · since 2.0.0

```ts
rules?: readonly RuleSpec[];
```

[`apply()`](Writer.apply.md)'s own block of rules, applied in array order, before every rule made through
[`find().set`](PartActions.set.md) (those form a later block that [`apply()`](Writer.apply.md) never removes). This list replaces only
[`apply()`](Writer.apply.md)'s block; `[]` clears only that block. In [`state().look`](SessionState.look.md), both blocks appear, in
order.

**Default:** unchanged

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `rules` names no product |
| 2. A precedent | pass: [CSS cascade (ordered, persistent rules)](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_cascade/Cascade) (row `G8`) |
| 3. Two apps, or labs | pass: 9 apps (ledger: app-b362a81c85, app-e61a0b42ad, app-f3598fad77, app-fc306ec3dc; fleet cross-check: app-378d190f1b, app-4f16d2f6da, app-510d750508, app-ceb4eccc72, app-fb16dd1985) |
| 4. The cheaper fix first | decided per need in Appendix B: rows `G8`, `K18` at tier stable (a member only where no rule, data, asset or app code serves the need) |