[API reference](https://evolu.dev/docs/api-reference) › [@evolu/sqlite-wasm](https://evolu.dev/docs/api-reference/sqlite-wasm) › sahPoolPersistentFileTypes

```ts
const sahPoolPersistentFileTypes: number;
```

Defined in: [packages/sqlite-wasm/src/SahPool.ts:1299](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/SahPool.ts#L1299)

The file types that persist across sessions: SQLITE_OPEN_MAIN_DB,
SQLITE_OPEN_MAIN_JOURNAL, SQLITE_OPEN_SUPER_JOURNAL and SQLITE_OPEN_WAL,
combined. A slot with another type is freed at setup.