---
title: "DerivedTheme"
description: "Everything derivation produces from one brand colour."
url: "https://opsinjs.pensievelabs.org/reference/api/DerivedTheme"
source: "https://opsinjs.pensievelabs.org/reference/api/DerivedTheme.md"
section: "Reference"
kind: "reference"
---

> Elements written as `<PascalCase … />` below are opsinjs documentation
> components. Their attributes are the content: the values they render are
> generated from `tokens/*.json` and `registry/catalogue.ts` and are
> published separately at https://opsinjs.pensievelabs.org/r/index.json and under the Reference
> section.
> Nothing is missing from this page. The data simply does not live in
> the prose.

{/* GENERATED - do not edit. Source: the declaration named in the table below.
    Script: scripts/build-reference.mts. Change the doc comment on the symbol. */}

<PageTemplate kind="reference" />

## How this is generated [#how-this-is-generated]

Source: `lib/color/derive.ts`. Script: `scripts/build-reference.mts`. Command:
`pnpm run generate`.

Everything below is copied from the symbol, so a page is improved by improving
its doc comment. The [API index](./index.mdx) says why there is a page per
symbol and what these pages still do not carry.

{/* opsinjs:generated:begin - everything below is replaced by scripts/build-reference.mts */}

## DerivedTheme [#derivedtheme]

Everything derivation produces from one brand colour. Both ramps, every role in light and dark, the contrast checks, the warnings, and whether it is sound.

| Kind      | Declared in           |
| --------- | --------------------- |
| interface | `lib/color/derive.ts` |

```ts
export interface DerivedTheme {
  brand: Oklch
  seed: Oklch
  brandRamp: Ramp
  neutralRamp: Ramp
  roles: Record<RoleName, RolePair>
  checks: ContrastCheck[]
  warnings: DeriveWarning[]
  sound: boolean
}
```

{/* opsinjs:generated:end */}