27 lines
971 B
TypeScript
27 lines
971 B
TypeScript
import { Expect } from './assert'
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import { Type } from '@sinclair/typebox'
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{
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// -------------------------------------------------------------------------
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// Issue: type T = number extends not number ? true : false // true
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// type T = number extends unknown ? true : false // true
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//
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// TypeScript does not support type negation. The best TypeBox can do is
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// treat "not" as "unknown". From this standpoint, the extends assignability
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// check needs to return true for the following case to keep TypeBox aligned
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// with TypeScript static inference.
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// -------------------------------------------------------------------------
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const A = Type.Number()
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const B = Type.Not(Type.Number())
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const T = Type.Extends(A, B, Type.Literal(true), Type.Literal(false))
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Expect(T).ToStatic<true>()
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}
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{
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const T = Type.Not(Type.Number())
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Expect(T).ToStatic<unknown>()
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}
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{
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const T = Type.Not(Type.Not(Type.Number()))
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Expect(T).ToStatic<number>()
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}
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