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Prevent the .not modifier from being chained #20

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merged 1 commit into from Nov 29, 2022
Merged

Prevent the .not modifier from being chained #20

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2 changes: 1 addition & 1 deletion src/index.ts
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Expand Up @@ -143,7 +143,7 @@ export interface ExpectTypeOf<Actual, B extends boolean> {
? never
: ExpectTypeOf<T, B>
: never
not: ExpectTypeOf<Actual, Not<B>>
not: Omit<ExpectTypeOf<Actual, Not<B>>, 'not'>
}
const fn: any = () => true

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5 changes: 5 additions & 0 deletions test/types.test.ts
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Expand Up @@ -70,6 +70,11 @@ test(`never types don't sneak by`, () => {
expectTypeOf<never>().toMatchTypeOf<{foo: string}>()
})

test('not cannot be chained', () => {
// @ts-expect-error
expectTypeOf<number>().not.not.toBeNumber()
})

test('constructor params', () => {
// The built-in ConstructorParameters type helper fails to pick up no-argument overloads.
// This test checks that's still the case to avoid unnecessarily maintaining a workaround,
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