Kent C. Dodds 3/2/2021

How to write a Constrained Identity Function (CIF) in TypeScript

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This article explains the problem of maintaining type safety when defining an object of functions in TypeScript. Using a calculator component as an example, it details the limitations of basic type annotations and introduces the Constrained Identity Function (CIF) pattern as a solution to enforce consistent function types and enable better type inference for object keys.

How to write a Constrained Identity Function (CIF) in TypeScript

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