Multiple brush targets in TS

[vargemp]

Description

Seems like there is an option to add multiple targets to brush chart
Source file

However, TS types don't include this, just single value
types, line 152

PR

Steps to Reproduce

1. Write chart options
2. Try to add mutiple brush chart targets
3. Be sad

Expected Behavior

"targets?: string[]" option should be there.

Actual Behavior

Only "target?: string" option is there.

Screenshots

Reproduction Link

There is no point for demo