TIP If you don't find the type you are looking for, you are welcome to open a feature request!

🏁 Getting Started

Prerequisites

Lowest TypeScript support starts at v3.5

npm install typescript@^3.6.0 --save-dev

For best results, add this to your tsconfig.json

{
  "compilerOptions": {
    // highly recommended (required by few utilities)
    "strictNullChecks": true,

    // this is optional, but enable whenever possible
    "strict": true,
  }
}

Installation

npm install ts-toolbelt --save

Hello World

import {Object} from 'ts-toolbelt'
// Check the docs below for more

// Merge two `object` together
type merge = Object.MergeUp<{name: string}, {age?: number}>
// {name: string, age?: number}

// Make a field of an `object` optional
type optional = Object.Optional<{id: number, name: string}, 'name'}>
// {id: number, name?: string}

TIP You can also grab the demo over here.

You can level-up, and re-code this library from scratch.

📖 Documentation ⤢

The project is organized around TypeScript's main concepts:

TIP How to choose categories? Match your type with the above categories.

The documentation is complete but needs more examples. So feel free to ask for examples, and I will update the docs.

Imports

There are many ways to import the types into your project:

• Explicit

  import {Any, Boolean, Class, Function, Iteration, List, Number, Object, String, Union} from 'ts-toolbelt'

• Compact

  import {A, B, C, F, I, L, N, O, S, U} from 'ts-toolbelt'

• Portable

  import tb from 'ts-toolbelt'

You can also import our non-official API from the community:

import {Community} from 'ts-toolbelt'

TIP The community API is for our community to publish useful types that don't see fit in the standard API.

Internal Docs

If you're interested to learn how the internals work, this tutorial will get you on track to start writing your own types.

Archives ⤢

Access older docs at https://pirix-gh.github.io/ts-toolbelt/version/

EXAMPLE https://pirix-gh.github.io/ts-toolbelt/4.2.1/

🧠 Good to Know ⤢

In this wiki, you will find some extra resources for your learning, and understanding.

Are you missing something? Participate to the open-wiki by posting your questions.

📣 Announcements ⤢

Stay up to date with the latest announcements with this regular digest of important changes.

🎁 Contributing

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:

Community

• Help the community with answers on Gitter
• Reporting bugs or requesting new features

Codebase

• Improving existing documentation
• Adding new types to the collection
• Getting involved with things to do

Pull Requests

1. Read the tutorial

2. Fork the project

3. Clone your fork

4. Create a pr/feature branch

   git checkout -b pr/CoolFeature

5. Commit your changes

   You must follow the conventional commit to be able to commit

   git commit -m 'feat(name): Added this CoolFeature'

6. Run the tests

7. Push your changes

   npm run release -- --no-tags

8. Open a pull request

💉 Running tests

For this project

To run the lint & type tests, simply run:

npm test

For your project

Want to test your own types? Let's get started:

import {Number, Test} from 'ts-toolbelt'

const {checks, check} = Test

checks([
    check<Number.Plus<'1', '30'>, '31', Test.Pass>(),
    check<Number.Plus<'5', '-3'>, '2',  Test.Pass>(),
])

TIP Place it in a file that won't be executed, it's just for TypeScript to test types.

Continuous Integration

The releases are done with Travis CI in stages & whenever a branch or PR is pushed:

• Tests are run with npm test
• Tests against DefinitelyTyped
• Releases to npm@[branch-name]

If you wrote tests & would like your project to be tested too, please open an issue.

🔧 Compatibility

The project is maintained to adapt to the constant changes of TypeScript:

Major version numbers will upgrade whenever TypeScript had breaking changes (it happened that TS had breaking changes on minor versions). Otherwise, the release versions will naturally follow the semantic versioning.

💼 For enterprise

Available as part of the Tidelift Subscription.

The maintainers of ts-toolbelt and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.

👏 Sponsoring issues

Sponsored issues have higher priority over non-critical issues.

You can either request a new feature or a bug fix, and then fund it.

The money will be transparently split with an issue's assignees.

🔮 What's next

• Automated performance tests

  # performance is checked manually with 
  npx tsc --noEmit --extendedDiagnostics

• Need to write more examples

🙏 Acknowledgements

Many, many thanks to all the contributors and:

• André Staltz
• Joe Calzaretta
• Matt McCutchen
• Monroe Ekilah
• Nathan S.-Sanders
• Regev Brody
• Titian C.-Dragomir

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• utility-types - Collection of utility types, complementing TypeScript built-in mapped types and aliases