Add RegExp as a valid type for the target option accepted by toHaveStyleRule (#2457)

* add RegExp as typing for target

- With typescript in place, the typing that only allows string will not be able to receive a RegExp.
Being able to receive a RegExp will allow target options describe in [this issue](#1875)

* Create sweet-planes-begin.md

* Update packages/jest/types/index.d.ts

Co-authored-by: Mateusz Burzyński <[email protected]>

Author: JC Lee

.changeset/sweet-planes-begin.md

@@ -0,0 +1,5 @@
+---
+"@emotion/jest": patch
+---
+
+Add `RegExp` as a valid type for the `target` option accepted by `toHaveStyleRule`.

packages/jest/src/matchers.js

@@ -43,7 +43,7 @@ function toHaveStyleRule(
   received: *,
   property: *,
   value: *,
-  options?: { target?: string, media?: string } = {}
+  options?: { target?: string | RegExp, media?: string } = {}
 ) {
   const { target, media } = options
   const classNames = getClassNamesFromNodes([received])

packages/jest/types/index.d.ts

@@ -9,7 +9,7 @@ type SnapshotSerializerPlugin = Extract<
 >
 
 export interface StyleRuleOptions {
-  target?: string
+  target?: string | RegExp
   media?: string
 }