(#320) Update toShow matcher accordingly

Author: s1hofmann

lib/expect/jest.matcher.function.ts

@@ -1,22 +1,23 @@
-import { Point } from "../point.class";
-import { Region } from "../region.class";
-import { toBeAt } from "./matchers/toBeAt.function";
-import { toBeIn } from "./matchers/toBeIn.function";
-import { toShow } from "./matchers/toShow.function";
-import {Image} from "../image.class";
+import {Point} from "../point.class";
+import {Region} from "../region.class";
+import {toBeAt} from "./matchers/toBeAt.function";
+import {toBeIn} from "./matchers/toBeIn.function";
+import {toShow} from "./matchers/toShow.function";
+import {FirstArgumentType} from "../typings";
+import {ScreenClass} from "../screen.class";
 
 declare global {
-  namespace jest {
-    interface Matchers<R> {
-      toBeAt: (position: Point) => {};
-      toBeIn: (region: Region) => {};
-      toShow: (needle: string | Image, confidence?: number) => {};
+    namespace jest {
+        interface Matchers<R> {
+            toBeAt: (position: Point) => {};
+            toBeIn: (region: Region) => {};
+            toShow: (needle: FirstArgumentType<typeof ScreenClass.prototype.find>, confidence?: number) => {};
+        }
     }
-  }
 }
 
 export const jestMatchers = {
-  toBeAt,
-  toBeIn,
-  toShow,
+    toBeAt,
+    toBeIn,
+    toShow,
 };

lib/expect/matchers/toShow.function.ts

@@ -1,10 +1,10 @@
 import {LocationParameters} from "../../locationparameters.class";
 import {ScreenClass} from "../../screen.class";
-import {Image} from "../../image.class";
+import {FirstArgumentType} from "../../typings";
 
 export const toShow = async (
     received: ScreenClass,
-    needle: string | Image,
+    needle: FirstArgumentType<typeof ScreenClass.prototype.find>,
     confidence?: number,
 ) => {
     let locationParams;