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type-plus

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type-plus

Provides additional types for `typescript`.

  • 1.28.0
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type-plus

unstable NPM version NPM downloads

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Visual Studio Code Wallaby.js

Provides additional types and type adjusted utilities for typescript

API

Identity type

  • Id<T>: generic Id type
  • createId<T>(type: T, value: string): Id<T>: create id
  • createIdCreator<T>(type: T): (value: string) => Id<T>: create an id creator

Constant Types

  • JSONTypes: all JSON compatible types.
  • KeyTypes: type of all keys.
  • PrimitiveTypes: all primitive types, including Function, symbol, and bigint

Object Key functions

  • filterKey(): type adjusted filter by key.
  • findKey(): type adjusted find by key.
  • forEachKey(): type adjusted for each by key.
  • HasKey<T, K>: predicate type checking T has key K.
  • hasKey(): function of HasKey.
  • KeysWithDiffTypes<A, B>: gets the keys common in A and B but with differnt value type.
  • mapKey(): type adjusted map by key.
  • reduceKey(): type adjusted reduce by key.
  • someKey(): type adjusted some by key.

Array function

  • literalArray(...entries): return an array those items are restricted to the provided literals.

Promise function

  • isPromise<R>(subject: any): isPromise() type guard.
  • PromiseValue<P>: Gets the type within the Promise.
  • mapSeries(): Similar to bluebird.mapSeries() but works with async/await.

Nominal Type

  • Flavor<FlavorT, T>: a flavored nominal type.
  • Brand<BrandT, T>: a branded nominal type.
  • createBrandCreator<BrandT, T>(): creates a brand creator to create branded nominal type.

Type manipulation

  • ANotB<A, B>: get object with properties in A and not in B, including properties with differnt value type.
  • BNotA<A, B>: flip of ANotB
  • Except<T, K>: Deprecated. Same as Omit<T, K>.
  • ExcludePropType<T, U>: excludes type U from properties in T.
  • Omit<T, K>: From T, pick a set of properties whose keys are not in the union K. This is the opposite of Pick<T, K>.
  • PartialExcept<T, U>: Deprecated. Same as PartialOmit<T, U>.
  • PartialOmit<T, U>: makes the properties not specified in U becomes optional.
  • PartialPick<T, U>: makes the properties specified in U becomes optional.
  • RecursivePartial<T>: make type T optional recursively.
  • RecursiveRequired<T>: make type T required recursively.
  • RequiredPick<T, U>: makes the properties specified in U becomes required.
  • RequiredExcept<T, U>: makes the properties not specified in U becomes required.
  • RecursiveIntersect<T, U>: intersect type U onto T recursively.
  • ValueOf<T>: type of the value of the properties of T.
  • PropType: ...no helper type for this. Just do YourType['propName'].

Type Predicates

Type predicates are type alias that returns true or false. They can be used to compose complex types.

  • HasKey<T, K>: predicate type checking T has key K.
  • IsDisjoint<A, B>: is A and B is a disjoint set.
  • IsSame<A, B>: is A and B has the same properties and types.
  • Not<T>: not operator for type.

Type assertion

  • assignability<T>(): creates a assignability function. To use it, do the following:
assertType.isTrue(assignability<YourType>()(subject)) // or
assertType.isFalse(assignability<YourType>()(subject))
  • assertType<T>(subject): assert subject satisfies type T.
  • assertType.isXXX(value): ensure typeof value is XXX
  • assertType.noXXX(value): ensure typeof value does not contain XXX. i.e. cannot assign XXX to value.
  • typeAssert.* (deprecated) replaced by assertType.
  • typeAssertion<T>(): creates a type assertion function of type T
type Foo = { a: number }
const assertIsFoo = typeAssertion<Foo>()
function createFoo() {
  return assertIsFoo({ a: 1, b: 2 })
}

Utility Functions

  • facade(subject, ...props): create a facade of subject.
  • getField(subject, key, defaultValue): get a field from a subject. Works against nullable and optional subject.
  • hasKey(): function of HasKey.
  • pick(obj, ...props): pick properties from obj.
  • required(...): merge options and removing Partial<T>. From unpartial
  • requiredDeep(...): merge options deeply and removing Partial<T>. From unpartial
  • tryAssign<S, T>(from: S, to: T): try assign from to to. Return type never if not possible.
  • typeOverrideIncompatible<T>(): override only the incompatiable portion between two types.
type A =  {
  foo: boolean,
  bar: string,
  baz: string
}

const overrider = typeOverrideIncompatible<A>()
const source = {
  foo: 1,
  bar: 'bar',
  baz: 'baz'
}

// only the `foo` property is available to override.
overrider(source, { foo: !!source.foo })

Attribution

Some of the code in this library are created by other people in the TypeScript community. I merely adding them in and may be making some adjustments. When ever possible, I add attribution to the person who created those code in the file.

Contribute

# after fork and clone
npm install

# begin making changes
git checkout -b <branch>
npm run watch

# after making change(s)
git commit -m "<commit message>"
git push

# create PR

FAQs

Package last updated on 17 Aug 2019

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