This is the Windows app named type-fest whose latest release can be downloaded as v5.0.1sourcecode.tar.gz. It can be run online in the free hosting provider OnWorks for workstations.
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SCREENSHOTS:
type-fest
DESCRIPTION:
type-fest is a TypeScript utility types library that offers a curated, battle-tested suite of type definitions and type transformations that aren’t included in the TypeScript standard library. It provides types like Except, Merge, LiteralUnion, Writable, Promisable, PartialDeep, JsonObject, and many others that solve everyday typing needs in complex TypeScript codebases. Developers pull in just the types they need, which makes code more expressive and safer without reinventing tricky type logic. Because many of the types in type-fest are things “that should have been built-in,” it’s widely adopted across TypeScript projects that need more advanced static typing capabilities. The package is modular, well documented, and regularly maintained to stay compatible with evolving TypeScript versions and features. It plays a central role in type-heavy codebases (frameworks, utilities, libraries) by reducing repetition and giving reliable tools for type-level programming.
Features
- Deep types for making nested objects optional or required (e.g. PartialDeep, RequiredDeep)
- Utility types for merging / overriding properties (Merge, MergeDeep, OverrideProperties)
- Types to enforce key constraints: RequireAtLeastOne, RequireExactlyOne, MergeExclusive etc.
- Types for readability and manipulation: turning readonly fields into mutable (Writable, WritableDeep), converting property names (like CamelCasedProperties, etc.), trimming strings, dealing with unions etc.
- JSON-related types: JsonValue, JsonObject, JsonArray etc. for better typing of JSON data
- Conditional / utility types: Extracting nested paths, handling index signatures, checking assignability, etc.
Programming Language
TypeScript
Categories
This is an application that can also be fetched from https://sourceforge.net/projects/type-fest.mirror/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.