Typescript 4.1 Beta Brings Template Literal — Types

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

: Combining a literal type with a template produces a single, specific string type. TypeScript 4.1 beta brings template literal types

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 TypeScript 4

: New as clauses allow developers to transform property names when creating new object types. For example, you can take an existing interface and generate a new one with "changed" suffixes for event handling. For example, you can take an existing interface

: 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