Merge pull request #6 from NoamGaash/fix/strict-types

fix: make types strictier

Author: NoamGaash

src/matchers/arrays.ts

@@ -1,7 +1,7 @@
-import { Matchers } from "../types";
+import { ExpectMatcherState } from "playwright/test";
 
-export const matchers: Matchers = {
-  toHaveDuplications(received: Array<unknown>) {
+export const matchers = {
+  toHaveDuplications(this: ExpectMatcherState, received: Array<unknown>) {
     const dups = received.toSorted().filter((item, index, arr) => item === arr[index - 1]);
     const uniqueDups = [...new Set(dups)];
     const pass = uniqueDups.length > 0;

src/types.d.ts

@@ -0,0 +1,20 @@
+import { test } from "@playwright/test";
+import { expect } from "../src";
+import { describe } from "node:test";
+
+test.describe("types", () => {
+  describe("valid", () => {
+    test("toHaveDuplications", async () => {
+      expect([1, 2, 2, 3]).toHaveDuplications();
+    });
+  });
+  
+  describe("invalid", () => {
+    // @ts-expect-error - invalid receiver type
+    expect("sdfsfsd").toHaveDuplication();
+    // @ts-expect-error - invalid matcher
+    void expect("sdfsfsd").thisAssertionDoesNotExist;
+    // @ts-expect-error - invalid argument type
+    expect([1, 2, 3]).toHaveDuplications(123);
+  });
+});