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subtractiontype.ts
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Subtraction types for TypeScript: e.g. Sub<'a' | 'b', 'a'> and Dissoc<{a: number, b: number}, 'a'>
Readme
Subtraction types for TypeScript: e.g. Sub<'a' | 'b', 'a'>
and Dissoc<{a: number, b: number}, 'a'>
.
npm install --save-dev subtractiontype.ts
// with modules
import {Sub, Dissoc} from 'subtractiontype.ts'
// without modules (yes, it says 'import', but it still doesn't count as a module and you
// don't have to repeat the type parameters like you would with `type = `)
///<reference path="node_modules/subtractiontype.ts/index.d.ts"/>
import Sub = nla.Sub
import Dissoc = nla.Dissoc
// string literal unions:
type A = Sub<'X' | 'Y' | 'Z', 'X' | 'Z'> // 'Y'
type B = Sub<'X' | 'Y', 'A'> // 'X' | 'Y'
// object types:
type C = Dissoc<{a: number, b: string}, 'a' | 'c'> // {b: string}
// if you want to subtract two object types, use `keyof`:
type D = Dissoc<{a: number, b: string}, keyof {a: number}> // {b: string}
MIT
FAQs
Subtraction types for TypeScript: e.g. Sub<'a' | 'b', 'a'> and Dissoc<{a: number, b: number}, 'a'>
The npm package subtractiontype.ts receives a total of 12 weekly downloads. As such, subtractiontype.ts popularity was classified as not popular.
We found that subtractiontype.ts demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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