Matt Forster 15b63bc89e
fix(types): correct typescript function headers (#10404)
Flow maybe types state;

> Maybe types accept the provided type as well as null or undefined. So ?number would mean number, null, or undefined.

So in this case, explicitly allow the type, null, or undefined in the
typescript definition.

Fixes #10403
2019-09-06 22:38:21 +02:00
..
2019-09-06 17:43:19 +02:00