A little magic: how the Playwright fixture API works

▤ Summary

This article explains how Playwright Test resolves fixture parameters for tests and why the framework requires object destructuring in the first argument. It walks through the internal logic behind parsing function signatures, using Function.prototype.toString() and regex-based extraction rather than AST parsing. It also shows how minification can rename parameters and break fixture detection unless the code preserves the expected structure. The piece focuses on developer experience and framework internals, making it useful for engineers who use or extend Playwright.

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