Glen Whitney
cc1e66c054
Adds a new subdirectory `interfaces` where standard interfaces are defined. Additional interfaces for a given operation can be added with an `AliasOf` type operator. Provides type operators that give the return type, full function type, and the type of a dependency on, a given operator. Resolves #6. Co-authored-by: Glen Whitney <glen@studioinfinity.org> Co-authored-by: Jos de Jong <wjosdejong@gmail.com> Reviewed-on: #8
25 lines
724 B
TypeScript
25 lines
724 B
TypeScript
import type { Signature } from '../interfaces/type.js'
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export const number_type = {
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before: ['Complex'],
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test: (n: unknown): n is number => typeof n === 'number',
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from: { string: (s: string) => +s }
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}
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declare module "../interfaces/type" {
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interface AssociatedTypes<T> {
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numbers: {
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type: number
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zero: 0
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one: 1
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nan: typeof NaN
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real: number
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}
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}
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}
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// I don't like the redundancy of repeating 'zero'; any way to eliminate that?
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export const zero: Signature<'zero', number> = (a) => 0
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export const one: Signature<'one', number> = (a) => 1
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export const nan: Signature<'nan', number> = (a) => NaN
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export const re: Signature<'re', number> = (a) => a
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