# core/persistence/icons.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-icons-persistence-ts
Source text: https://banes-lab.com/source/build-scripts/core/persistence/icons.persistence.ts.txt

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

## Definitions

- `writeFontSubset` (lexical_declaration, line 10, exported)
- `subset` (lexical_declaration, line 15, exported)

## Contained in

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

## Used by

- [core/coordinators/icons.coordinator.ts](https://banes-lab.com/source/build-scripts/core/coordinators/icons.coordinator.ts.md)

## Linked from

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

## Source

```typescript
import { FONT_FORMAT, SUBSET_FILE } from "#configuration/constants/icons.constants";
import { mkdirSync, readFileSync } from "node:fs";
import { absolutePath } from "@ssot/paths";
import { fontSource } from "#core/resolvers/icons.resolver";
import { glyphTextOf } from "#core/formatters/icons.formatter";
import { join } from "node:path";
import subsetFont from "subset-font";
import { writeVerbatim } from "@govlab/canonical-write";

export const writeFontSubset = async function writeFontSubset(
    names: readonly string[],
    folder = absolutePath("app.iconFont"),
): Promise<void> {
    mkdirSync(folder, { recursive: true });
    const subset = await subsetFont(readFileSync(fontSource()), glyphTextOf(names), { targetFormat: FONT_FORMAT });
    writeVerbatim(join(folder, SUBSET_FILE), subset);
};
```