What units (KB, MB, GB...) does this support?

The pretty-bytes library supports multiple sets of units depending on the options you use:

Standard Byte Units (SI Prefix, base-10): B, kB, MB, GB, TB, PB, EB, ZB, YB — defined in [index.js:L1-L9]

Binary Byte Units (Binary Prefix, base-2): B, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB — defined in [index.js:L11-L19]

Bit Units (SI Prefix): b, kbit, Mbit, Gbit, Tbit, Pbit, Ebit, Zbit, Ybit — defined in [index.js:L21-L29]

Binary Bit Units (Binary Prefix): b, kibit, Mibit, Gibit, Tibit, Pibit, Eibit, Zibit, Yibit — defined in [index.js:L31-L39]

Which unit set is used depends on the options passed to the function:

• Default: SI Prefix bytes (B, kB, MB, etc.)
• With {binary: true}: Binary Prefix bytes (B, KiB, MiB, etc.) — useful for memory amounts
• With {bits: true}: SI Prefix bits (b, kbit, Mbit, etc.)
• With {bits: true, binary: true}: Binary Prefix bits (b, kibit, Mibit, etc.)

FOLLOW_UPS:

• How does the library choose which unit to display?
• What's the difference between SI and binary prefixes?
• Can you customize the unit labels?