Typescript 4.1 Beta Brings Template Literal Types Now

This "paper" explores the introduction and application of template literal types, a feature introduced in the TypeScript 4.1 beta that expanded the language's ability to manipulate strings within the type system. Overview of Template Literal Types

: If a union of types is used within the template, TypeScript generates every possible combination of those strings. TypeScript 4.1 beta brings template literal types

: Combining a literal type with a template produces a single, specific string type. This "paper" explores the introduction and application of

These utilities allow developers to transform string types for specific needs, such as ensuring event names are consistently uppercase or converting between camelCase and PascalCase. Practical Applications These utilities allow developers to transform string types

: When combined with conditional types and the infer keyword, template literal types can act as a simple parser, breaking down complex strings into their constituent parts for deep type inspection. Conclusion Documentation - Template Literal Types - TypeScript

TypeScript 4.1 also introduced to support these new capabilities: Uppercase Lowercase Capitalize Uncapitalize