Data structures in TypeScript type system: A Map that maps types to types!

2023/07/17

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The article showcases the "type2type" library, which implements four classic data structures in the TypeScript type system: Stack, Queue, Set, and Map. These data structures are implemented using only types, without any JavaScript code. The library provides good unit test coverage, ensuring the reliability of the implementations.

Developers can easily install and use the "type2type" library in their TypeScript projects. For example, they can implement static parentheses validation in the TypeScript type system using the library. The article provides code examples and explains how to apply this validation outside the type system by declaring a function return type based on the generic.

The "type2type" library also introduces additional methods for the Stack and Queue data structures, allowing developers to manipulate the data in LIFO (Last-In, First-Out) and FIFO (First-In, First-Out) order, respectively. The Set data structure provides set operations and a select method to filter elements of a certain type. The Map data structure offers map operations and methods to extract keys and values as tuples.

Developers can leverage the "type2type" library to create type-safe data structures and enhance the type system capabilities in their TypeScript projects. The library was built in 2023 by Vladimir Klepov and is available under the MIT License.

For more information, including code examples and documentation, visit the GitHub repository: thoughtspile/type2type