[Feature]: WebP format global configuration

[kristaps-aksjonovs]

🚀 Feature Request

With the nice release of: https://playwright.dev/docs/release-notes#%EF%B8%8F-webp-screenshots

WebP format depends on await expect(page).toHaveScreenshot('homepage.webp'); extension being used in name. But it would be great if format could be defined in global configuration so that all screenshots use it.

Example

For example:

  expect: {
    toHaveScreenshot: {
      threshold: 0.1,
      maxDiffPixelRatio: 0.001,
      screenshotFormat: "webp",
    },
  },

Motivation

toHaveScreenshot() works also without providing the name. Seems inital implementation doesn't take that into consideration.

And to avoid hacks like:

pathTemplate: "./screenshots/{projectName}/{testName}{ext}",
->
pathTemplate: "./screenshots/{projectName}/{testName}.webp",