Error: Diplayed value in UI can be `null`

[hinogi]

Reproduction example

null

Prerequisites

Setting a value to null programmatically.

user-event/src/document/UI.ts

Line 24 in 63ac399

return typeof value === 'object' && UIValue in value

Expected behavior

Nothing happens

Actual behavior

TypeError: right hand side of 'in' should be an object, got null
Since EcmaScript returns object on typeof null this function is not safe

user-event/src/document/UI.ts

Line 24 in 63ac399

return typeof value === 'object' && UIValue in value

User-event version

14.6.1

Environment

No response

Additional context

No response