# core/persistence/tab.persistence.ts

> 16 lines of code and 2 definitions.

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

Listed in [core/persistence](https://banes-lab.com/api/source/build-scripts/core/persistence.md), after [core/persistence/route.persistence.ts](https://banes-lab.com/source/build-scripts/core/persistence/route.persistence.ts.md) and before [core/persistence/text.persistence.ts](https://banes-lab.com/source/build-scripts/core/persistence/text.persistence.ts.md).

## Definitions

- `buildTabs` (lexical_declaration, line 9, exported)
- `pages` (lexical_declaration, line 14, exported)

## Contained in

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

## Uses

- [core/formatters/tab.formatter.ts](https://banes-lab.com/source/build-scripts/core/formatters/tab.formatter.ts.md)

## Linked from

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

## Source

```typescript
import { SITE_PAGES } from "#configuration/constants/learning.constants";
import type { TabRouter } from "#types/tab.types";
import type { TabsFor } from "#types/learning.types";
import { absolutePath } from "@ssot/paths";
import { pageTabsOf } from "#core/converters/tab.converter";
import { renderTabs } from "#core/formatters/tab.formatter";
import { writeCanonicalText } from "@govlab/canonical-write";

export const buildTabs = async function buildTabs(
    router: TabRouter,
    tabsFor: TabsFor,
    file = absolutePath("app.tabs"),
): Promise<number> {
    const pages = SITE_PAGES.map((page) => pageTabsOf(router, page, tabsFor));
    await writeCanonicalText(file, renderTabs(pages));
    return pages.reduce((total, page) => total + page.tabs.length, 0);
};
```