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CodeceptJS pixelmatch helper

This package is inspired by codeceptjs-resemblehelper.

Integrates visual regression tests in CodeceptJS using the pixelmatch library. It works with all current CodeceptJS drivers: Playwright, Webdriver, Puppeteer, Appium, TestCafe.

Two screenshots are compared for differences, using a custom tolerance. When both images are equal enough, the test passes. When there are too many differences, the test fails.

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