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various typescript helper functions and utility types

playwright [custom selector engines](https://playwright.dev/docs/extensibility#custom-selector-engines) for [sapui5](https://ui5.sap.com/)

a playwright [custom selector engine](https://playwright.dev/docs/extensibility#custom-selector-engines) for xpath 3.1 using [fontoxpath](https://github.com/FontoXML/fontoxpath)

a typescript utility type that evaluates a json schema into a type at compiletime. unlike other JSON schema to type converters, this one doesn't use any code generation! :o

a fork of pyright with various type checking improvements, pylance features and more.