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NonExtendableKeys
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This commit is contained in:
Julien Valverdé
2024-02-19 21:19:25 +01:00
parent 9f36ce85be
commit eee35e7d59
2 changed files with 21 additions and 9 deletions
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4
src/tests.ts
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@@ -2,7 +2,7 @@ import { TraitClass } from "./Trait"
import { trait } from "./TraitBuilder" import { trait } from "./TraitBuilder"
import { Implements, ImplementsStatic, TraitExpressionClass } from "./TraitExpression" import { Implements, ImplementsStatic, TraitExpressionClass } from "./TraitExpression"
import { expression } from "./TraitExpressionBuilder" import { expression } from "./TraitExpressionBuilder"
import { Extendable } from "./util" import { Extendable, NonExtendableKeys } from "./util"
const PrintsHelloOnNew = trait const PrintsHelloOnNew = trait
@@ -84,7 +84,7 @@ class User extends exp.extends implements Implements<typeof exp> {
console.log(new User()) console.log(new User())
type T = Extendable<[ type T = NonExtendableKeys<[
{ prout: string }, { prout: string },
{ prout: "gneugneu" }, { prout: "gneugneu" },
]> ]>

26
src/util/extend.ts
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@@ -24,7 +24,7 @@ export type Extend<T extends readonly object[]> = (
T extends [ T extends [
infer Super, infer Super,
infer Self, infer Self,
...infer Rest extends object[] ...infer Rest extends object[],
] ]
? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>> ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
? Extend<[ ? Extend<[
@@ -39,13 +39,13 @@ export type Extend<T extends readonly object[]> = (
export type Extendable<T extends readonly object[]> = ( export type Extendable<T extends readonly object[]> = (
T extends [ T extends [
infer Super extends object, infer Super,
infer Self extends object, infer Self,
...infer Rest extends object[], ...infer Rest extends object[],
] ]
? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>> ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
? Extendable<[ ? Extendable<[
Super & Self, Omit<Super, CommonKeys<Self, Super>> & Self,
...Rest, ...Rest,
]> ]>
: false : false
@@ -53,7 +53,19 @@ export type Extendable<T extends readonly object[]> = (
) )
export type NonExtendableKeys<T extends readonly object[]> = ( export type NonExtendableKeys<T extends readonly object[]> = (
Extendable<T> extends false T extends [
? {} infer Super extends object,
: never infer Self extends object,
...infer Rest extends object[],
]
? {
[K in keyof Super & keyof Self]: Self[K] extends Super[K]
? never
: K
}[keyof Super & keyof Self]
| NonExtendableKeys<[
Super & Self,
...Rest,
]>
: void
) )