A comprehensive collection of more than 150 high-performance TypeScript type utilities focused on type safety and developer experience.
- Zero Runtime Overhead - Pure type definitions
- Type Safety - Advanced constraint utilities
- Modular Design - Import only what you need
- Rich Toolset - From basic to advanced type operations
- IntelliSense Optimized - Great IDE support
npm install devtypesRead the full devtypes Documentation for detailed usage instructions, examples, and API references.
importtype{Merge}from'devtypes/types/merge';importtype{RequireExactlyOne}from'devtypes/types/constraint';typeUserBase={id: number;name: string;email?: string};typeUserAuth={email: string;password: string};// Merge types (smart conflict resolution)typeUser=Merge<UserBase,UserAuth>;// { id: number; name: string; email: string; password: string }// Require exactly one fieldtypeLoginCredentials=RequireExactlyOne<{email?: string;phone?: string;username?: string;},'email'|'phone'|'username'>;importtype{DeepPartial,DeepRequired}from'devtypes/types/transform';interfaceConfig{server: {port: number;host: string;ssl?: {cert: string;key: string;};};database: {url: string;timeout?: number;};}// Make everything optionaltypePartialConfig=DeepPartial<Config>;// Make everything requiredtypeFullConfig=DeepRequired<Config>;| Module | Purpose |
|---|---|
| assert | Assertion utilities for compile-time checks |
| class | Class-specific utilities: methods, properties, constructors |
| condition | Conditional type utilities (If and Equals) |
| constraint | Property requirement constraints and validation |
| functional | Functional type utilities: curry, compose, promisify |
| guard | Type guard utilities for runtime type checking |
| list | List-like structures (arrays, sets, maps, records, iterables) |
| merge | (Deep) merging and intersection of types |
| object | Object type manipulation and property utilities |
| primitive | Primitive type utilities and literal handling |
| transform | (Deep) transformations for objects, arrays, and nested structures |
| tuple | Tuple-specific utilities and manipulations |
| union | Union type utilities: exclusion, extraction, conversion |
| util | Generic utility types: branding, boxing, casting, simplification |
Import from specific modules for best IDE performance:
// Good - direct importimporttype{Brand}from'devtypes/types/util';importtype{MethodNames}from'devtypes/types/class';// Avoid - star imports slow down IntelliSenseimporttype*asTypesfrom'devtypes';Contributions are welcome! Please feel free to submit a pull request.
Copyright 2025–2026 Paul Köhler (komed3).
Distributed under the MIT license.