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As part of my efforts on ts-unify, I needed a way to represent ‘capturing’ and transforming values in a data structure from one form to another. This article elucidates those extraction semantics.

I’ve been playing with codemod transformations for TypeScript using jscodeshift (from Facebook) and ts-pattern. Working closely with these has made me want a declarative type-aware codemod engine for TypeScript, which I haven’t yet been able to find.