Can I get binary (KiB, MiB) units instead of decimal? How?

Question

RepoPilot · Accepted Answer

Yes, you can use binary units by setting the `binary` option to `true`.

The library defines separate unit arrays for binary formatting. When `binary: true` is set, the function uses `BIBYTE_UNITS` (for bytes) or `BIBIT_UNITS` (for bits) instead of the default decimal units [index.js:L1-L34].

Here's how to use it:

```js
import prettyBytes from 'pretty-bytes';

prettyBytes(1024, {binary: true});
//=> '1 KiB'
```

The key difference is:
- **Without `binary` option** (default): Uses SI prefix (base-10) → `1000 bytes = 1 kB`
- **With `binary: true`**: Uses binary prefix (base-2) → `1024 bytes = 1 KiB`

As shown in the examples, `prettyBytes(1000, {binary: true})` returns `'1000 B'` (still bytes since it's below 1 KiB), while `prettyBytes(1024, {binary: true})` returns `'1 KiB'` [readme.md:L86-L90].

The unit selection logic is in the main function [index.js:L139-L141], where it chooses between `BIBYTE_UNITS` or `BYTE_UNITS` based on your `binary` option setting.

FOLLOW_UPS:
- What's the difference between KiB and kB?
- How do I display bits instead of bytes?
- Can I combine binary with other formatting options?