Answer

Declaring Custom Matchers in Playwright

To declare a custom matcher with a specified receiver argument type in Playwright using TypeScript, you'll need to follow a few steps.

Step 1: Create a Global Declaration File

First, create a global.d.ts file in your repository if it doesn't already exist. Make sure this file is included in your tsconfig.json via the include or compilerOptions.typeRoots option.

export {};

Step 2: Declare a Namespace

Next, declare a namespace called PlaywrightTest within the global namespace.

declare global {
  namespace PlaywrightTest {
    // Custom matchers go here
  }
}

Step 3: Define an Interface

Inside the PlaywrightTest namespace, define an interface called Matchers<R, T> to extend Playwright's existing matchers.

declare global {
  namespace PlaywrightTest {
    interface Matchers<R, T> {
      // Custom matcher declarations go here
    }
  }
}

Step 4: Declare Your Custom Matcher

Finally, within this interface, declare your custom matcher by specifying its name and arguments along with their types.

declare global {
  namespace PlaywrightTest {
    interface Matchers<R, T> {
      myCustomMatcher(arg1: string): R;
      // Add more custom matchers if needed
    }
  }
}

By following these steps, you can specify the type of receiver argument for each custom matcher in Playwright using TypeScript. If you need more information or have any questions, feel free to ask.