fix: checkDependencies if no pkg was found

Author: mxschmitt

src/utils.test.ts

@@ -215,6 +215,24 @@ describe('readPackage', () => {
       { virtual: true },
     )
 
+    const playwright = await readPackage()
+    expect(playwright).toStrictEqual({ [FIREFOX]: FIREFOX })
+  })
+  it('should return playwright-firefox when it is defined and empty dependencies are persistent', async () => {
+    ;((fs.exists as unknown) as jest.Mock).mockImplementationOnce(
+      (_, cb: (exists: boolean) => void) => cb(true),
+    )
+    jest.mock(
+      path.join(__dirname, '..', 'package.json'),
+      () => ({
+        dependencies: {},
+        devDependencies: {
+          'playwright-firefox': '*',
+        },
+      }),
+      { virtual: true },
+    )
+
     const playwright = await readPackage()
     expect(playwright).toStrictEqual({ [FIREFOX]: FIREFOX })
   })

src/utils.ts

@@ -27,6 +27,9 @@ export const checkDependencies = (
   if (dependencies[`playwright-${WEBKIT}`]) {
     packages[WEBKIT] = WEBKIT
   }
+  if (Object.keys(packages).length === 0) {
+    return null
+  }
   return packages
 }