# sizeOf

`import { sizeOf } from "destack:reflect";`

Return the target-specific size of `T`.

```ds title="sizeOf"
export declare function sizeOf<T: Concrete>(): usize
```

[language/library/src/reflect/type.ds:74](https://github.com/destack-sh/destack/blob/main/language/library/src/reflect/type.ds#L74)