# core/selectors/page.selector.ts

> 12 lines of code and 2 definitions.

Tree: Bane's Lab Build Scripts
Language: typescript
Layer: application
Canonical: https://banes-lab.com/anatomy/build-scripts#file-build-scripts-core-selectors-page-selector-ts
Source text: https://banes-lab.com/source/build-scripts/core/selectors/page.selector.ts.txt

Listed in [core/selectors](https://banes-lab.com/api/source/build-scripts/core/selectors.md), after [core/selectors/markup.selector.ts](https://banes-lab.com/source/build-scripts/core/selectors/markup.selector.ts.md) and before [core/selectors/record.selector.ts](https://banes-lab.com/source/build-scripts/core/selectors/record.selector.ts.md).

## Definitions

- `definitionOf` (lexical_declaration, line 4, exported)
- `definition` (lexical_declaration, line 8, exported)

## Contained in

- [core/selectors](https://banes-lab.com/anatomy/build-scripts/folder-build-scripts-core-selectors.md)

## Uses

- [configuration/strings/page.strings.ts](https://banes-lab.com/source/build-scripts/configuration/strings/page.strings.ts.md)

## Linked from

- [configuration/strings](https://banes-lab.com/anatomy/build-scripts/folder-build-scripts-configuration-strings.md)

## Source

```typescript
import type { PageDefinition, PageRegistry } from "#types/page.types";
import { unregisteredPage } from "#configuration/strings/page.strings";

export const definitionOf = function definitionOf(
    loaded: { readonly registry: Pick<PageRegistry, "loadedPage"> },
    page: string,
): PageDefinition {
    const definition = loaded.registry.loadedPage(page);
    if (definition === undefined) {
        throw new Error(unregisteredPage(page));
    }
    return definition;
};
```