Aaron Parecki

"For example, we want input behavior for RTL languages such as Arabic and Hebrew to meet users' expectations. We also want to be able to support editor contents with a mixture of LTR and RTL text.

To that end, Draft uses a bidi algorithm to determine appropriate text alignment and direction on a per-block basis.

Text is rendered with an LTR or RTL direction automatically as the user types. You should not need to do anything to set direction yourself."