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ts-toolbelt
Advanced tools
The ts-toolbelt package provides a comprehensive set of type utilities to improve TypeScript typing and enable type transformations, checks, and more complex operations. It enhances TypeScript's static typing capabilities and helps in building more robust type-safe applications.
Object Manipulation
Merge two types into one. This is useful for combining properties from multiple objects into a single type.
{ type Merged = Merge<{name: string}, {age: number}>; // Result: {name: string, age: number} }
Type Checking
Check if two types are equivalent. This utility helps in validating type structures for consistency.
{ type check = Equals<{a: string}, {a: string, b: number}>; // Result: false }
Conditional Types
Apply conditional logic to types. This feature allows for conditional type assignments based on certain conditions.
{ type Conditional = If<true, 'Yes', 'No'>; // Result: 'Yes' }
Provides a collection of utility types for TypeScript, similar to ts-toolbelt. While utility-types focuses more on transformations and mappings, ts-toolbelt offers a broader range of type operations including type checks and advanced manipulations.
A package that includes a variety of utility types for TypeScript. Type-fest is similar to ts-toolbelt but tends to be simpler and more focused on everyday use cases, whereas ts-toolbelt provides more comprehensive and complex utilities for advanced type manipulation.
๐ท Higher type safety for TypeScript
Explore the docs ยป
๐ฎ View Demo
ยท
๐ Report Bug
ยท
๐ฉ Request Feature
ts-toolbelt is a collection of types that makes TypeScript even safer. It's goal is to improve type correctness while adding a whole new set of features to TypeScript.
It uses the type system itself for TypeScript to compute more complex types. In other words, its API exposes types that trade CPU & RAM for higher type safety.
ts-toolbelt completes TypeScript with a collection of more than 150 tested types.
Here's some of the most useful features:
If you don't find the type you are looking for, you are welcome to open a feature request!
npm install typescript@^3.5.0 --save
npm install ts-toolbelt --save
import {A, B, C, F, I, N, O, S, T, U} from 'ts-toolbelt'
// Wonder what these letters mean? Check the docs below
// Merge two `object` together
type merge = O.Merge<{name: string}, {age?: number}>
The project is organized around TypeScript's main concepts:
A(ny) | C(lass) | I(teration) | O(bject) | T(uple) |
B(boolean) | F(unction) | N(umber) | S(tring) | U(nion) |
When you are going to combine types together
import {A, B, C, F, I, N, O, S, T, U} from 'ts-toolbelt'
When you are just using simple type operations
import {Any, Boolean, Class, Function, Iteration, Number, Object, String, Tuple, Union} from 'ts-toolbelt'
When you want to keep them in a single namespace
import tb from 'ts-toolbelt'
If you're interested to learn how the internals work, this tutorial will get you on track to start writing your own types.
Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated. There are many ways to contribute to the project:
git checkout -b pr/CoolFeature
git commit -m 'Added this CoolFeature'
git push origin pr/CoolFeature
Sponsored issues have higher priority over non-critical issues.
You can either request a new feature or a bug fix then fund it.
The money will be transparently split with an issue's assignees.
To run the lint
& type
tests, simply run:
npm test
Want to test your own types? Let's get started:
import {A, B, C, F, I, N, O, S, T, U, Test} from 'ts-toolbelt'
const {checks, check} = Test
checks([
check<N.Plus<'1', '30'>, '31', Test.Pass>(),
check<N.Plus<'5', '-3'>, '2', Test.Pass>(),
])
Place it in a file that won't be executed, it's just for TypeScript to test types
The project is maintained to adapt to the constant changes of TypeScript:
ts-toolbelt | typescript |
---|---|
1.0.x | 3.5.x |
# performance is checked manually with
npx tsc --noEmit --extendedDiagnostics
Many, many thanks to all the contributors and:
FAQs
TypeScript's largest utility library
The npm package ts-toolbelt receives a total of 1,367,469 weekly downloads. As such, ts-toolbelt popularity was classified as popular.
We found that ts-toolbelt demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.ย It has 1 open source maintainer collaborating on the project.
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