The Record type in TypeScript is a powerful tool for modeling objects whose set of keys and their value type are well defined. Instead of using loose index signatures, Record allows declaring typed maps where the type of the keys and the type of the values are specified, for example string keys and number values. This improves type safety and reduces errors from misspelled property names.
Common use cases include representing catalogs, translations by locale, per-module configuration, and associations between identifiers and data. Record works very well with useful TypeScript operators such as keyof, generics, Partial, and Pick to build complex and reusable types.
Combining Record with key unions and const assertions yields a robust type system that clearly expresses the relationships between keys and values. For runtime cases, it is recommended to complement typing with validations and unit tests, and to document the allowed keys to facilitate maintenance.
Best practices include defining keys as literal types or unions, avoiding excessive use of any, and using Record to model predictable dictionaries instead of open objects. It is also effective to use Record to type API responses when the shape of the response is a collection indexed by identifier.
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