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Discard types that reduce to never before discriminating by discriminable items
#62275
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122 changes: 122 additions & 0 deletions
122
tests/baselines/reference/contextuallyTypedByDiscriminableUnion2.symbols
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| //// [tests/cases/compiler/contextuallyTypedByDiscriminableUnion2.ts] //// | ||
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| === contextuallyTypedByDiscriminableUnion2.ts === | ||
| // https://github.com/microsoft/TypeScript/issues/62256 | ||
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| type Identifiable = { id: string }; | ||
| >Identifiable : Symbol(Identifiable, Decl(contextuallyTypedByDiscriminableUnion2.ts, 0, 0)) | ||
| >id : Symbol(id, Decl(contextuallyTypedByDiscriminableUnion2.ts, 2, 21)) | ||
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| interface EnableA { | ||
| >EnableA : Symbol(EnableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 2, 35)) | ||
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| readonly enableA: true; | ||
| >enableA : Symbol(EnableA.enableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 4, 19)) | ||
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| // this introduces a conflicting property with some of the other members of MyComponentProps | ||
| // making relevant final union members reduced nevers | ||
| readonly enableB: true; | ||
| >enableB : Symbol(EnableA.enableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 5, 25)) | ||
| } | ||
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| interface DisableA { | ||
| >DisableA : Symbol(DisableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 9, 1)) | ||
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| readonly enableA?: false; | ||
| >enableA : Symbol(DisableA.enableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 11, 20)) | ||
| } | ||
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| interface EnableB { | ||
| >EnableB : Symbol(EnableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 13, 1)) | ||
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| readonly enableB?: true; | ||
| >enableB : Symbol(EnableB.enableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 15, 19)) | ||
| } | ||
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| interface DisableB { | ||
| >DisableB : Symbol(DisableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 17, 1)) | ||
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| readonly enableB: false; | ||
| >enableB : Symbol(DisableB.enableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 19, 20)) | ||
| } | ||
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| export interface EnableD<I extends Identifiable> { | ||
| >EnableD : Symbol(EnableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 21, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 23, 25)) | ||
| >Identifiable : Symbol(Identifiable, Decl(contextuallyTypedByDiscriminableUnion2.ts, 0, 0)) | ||
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| readonly enableD: true; | ||
| >enableD : Symbol(EnableD.enableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 23, 50)) | ||
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| readonly value: I["id"] | null; | ||
| >value : Symbol(EnableD.value, Decl(contextuallyTypedByDiscriminableUnion2.ts, 24, 25)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 23, 25)) | ||
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| readonly setItem: (item: I | null) => void; | ||
| >setItem : Symbol(EnableD.setItem, Decl(contextuallyTypedByDiscriminableUnion2.ts, 25, 33)) | ||
| >item : Symbol(item, Decl(contextuallyTypedByDiscriminableUnion2.ts, 26, 21)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 23, 25)) | ||
| } | ||
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| export interface DisableD<I extends Identifiable> { | ||
| >DisableD : Symbol(DisableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 27, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 29, 26)) | ||
| >Identifiable : Symbol(Identifiable, Decl(contextuallyTypedByDiscriminableUnion2.ts, 0, 0)) | ||
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| readonly enableD: false; | ||
| >enableD : Symbol(DisableD.enableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 29, 51)) | ||
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| readonly value: I["id"]; | ||
| >value : Symbol(DisableD.value, Decl(contextuallyTypedByDiscriminableUnion2.ts, 30, 26)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 29, 26)) | ||
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| readonly setItem: (item: I) => void; | ||
| >setItem : Symbol(DisableD.setItem, Decl(contextuallyTypedByDiscriminableUnion2.ts, 31, 26)) | ||
| >item : Symbol(item, Decl(contextuallyTypedByDiscriminableUnion2.ts, 32, 21)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 29, 26)) | ||
| } | ||
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| type MyComponentProps<I extends Identifiable> = (EnableA | DisableA) & | ||
| >MyComponentProps : Symbol(MyComponentProps, Decl(contextuallyTypedByDiscriminableUnion2.ts, 33, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 35, 22)) | ||
| >Identifiable : Symbol(Identifiable, Decl(contextuallyTypedByDiscriminableUnion2.ts, 0, 0)) | ||
| >EnableA : Symbol(EnableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 2, 35)) | ||
| >DisableA : Symbol(DisableA, Decl(contextuallyTypedByDiscriminableUnion2.ts, 9, 1)) | ||
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| (EnableB | DisableB) & | ||
| >EnableB : Symbol(EnableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 13, 1)) | ||
| >DisableB : Symbol(DisableB, Decl(contextuallyTypedByDiscriminableUnion2.ts, 17, 1)) | ||
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| (DisableD<I> | EnableD<I>); | ||
| >DisableD : Symbol(DisableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 27, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 35, 22)) | ||
| >EnableD : Symbol(EnableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 21, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 35, 22)) | ||
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| const MyComponent = <I extends Identifiable>(props: MyComponentProps<I>) => {}; | ||
| >MyComponent : Symbol(MyComponent, Decl(contextuallyTypedByDiscriminableUnion2.ts, 39, 5)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 39, 21)) | ||
| >Identifiable : Symbol(Identifiable, Decl(contextuallyTypedByDiscriminableUnion2.ts, 0, 0)) | ||
| >props : Symbol(props, Decl(contextuallyTypedByDiscriminableUnion2.ts, 39, 45)) | ||
| >MyComponentProps : Symbol(MyComponentProps, Decl(contextuallyTypedByDiscriminableUnion2.ts, 33, 1)) | ||
| >I : Symbol(I, Decl(contextuallyTypedByDiscriminableUnion2.ts, 39, 21)) | ||
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| declare const item: string | null; | ||
| >item : Symbol(item, Decl(contextuallyTypedByDiscriminableUnion2.ts, 41, 13)) | ||
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| MyComponent({ | ||
| >MyComponent : Symbol(MyComponent, Decl(contextuallyTypedByDiscriminableUnion2.ts, 39, 5)) | ||
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| enableD: true, | ||
| >enableD : Symbol(enableD, Decl(contextuallyTypedByDiscriminableUnion2.ts, 43, 13)) | ||
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| value: item, | ||
| >value : Symbol(value, Decl(contextuallyTypedByDiscriminableUnion2.ts, 44, 16)) | ||
| >item : Symbol(item, Decl(contextuallyTypedByDiscriminableUnion2.ts, 41, 13)) | ||
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| setItem: (item) => {}, | ||
| >setItem : Symbol(setItem, Decl(contextuallyTypedByDiscriminableUnion2.ts, 45, 14)) | ||
| >item : Symbol(item, Decl(contextuallyTypedByDiscriminableUnion2.ts, 46, 12)) | ||
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| }); | ||
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136 changes: 136 additions & 0 deletions
136
tests/baselines/reference/contextuallyTypedByDiscriminableUnion2.types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| //// [tests/cases/compiler/contextuallyTypedByDiscriminableUnion2.ts] //// | ||
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| === contextuallyTypedByDiscriminableUnion2.ts === | ||
| // https://github.com/microsoft/TypeScript/issues/62256 | ||
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| type Identifiable = { id: string }; | ||
| >Identifiable : Identifiable | ||
| > : ^^^^^^^^^^^^ | ||
| >id : string | ||
| > : ^^^^^^ | ||
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| interface EnableA { | ||
| readonly enableA: true; | ||
| >enableA : true | ||
| > : ^^^^ | ||
| >true : true | ||
| > : ^^^^ | ||
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| // this introduces a conflicting property with some of the other members of MyComponentProps | ||
| // making relevant final union members reduced nevers | ||
| readonly enableB: true; | ||
| >enableB : true | ||
| > : ^^^^ | ||
| >true : true | ||
| > : ^^^^ | ||
| } | ||
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| interface DisableA { | ||
| readonly enableA?: false; | ||
| >enableA : false | undefined | ||
| > : ^^^^^^^^^^^^^^^^^ | ||
| >false : false | ||
| > : ^^^^^ | ||
| } | ||
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| interface EnableB { | ||
| readonly enableB?: true; | ||
| >enableB : true | undefined | ||
| > : ^^^^^^^^^^^^^^^^ | ||
| >true : true | ||
| > : ^^^^ | ||
| } | ||
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| interface DisableB { | ||
| readonly enableB: false; | ||
| >enableB : false | ||
| > : ^^^^^ | ||
| >false : false | ||
| > : ^^^^^ | ||
| } | ||
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| export interface EnableD<I extends Identifiable> { | ||
| readonly enableD: true; | ||
| >enableD : true | ||
| > : ^^^^ | ||
| >true : true | ||
| > : ^^^^ | ||
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| readonly value: I["id"] | null; | ||
| >value : I["id"] | null | ||
| > : ^^^^^^^^^^^^^^ | ||
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| readonly setItem: (item: I | null) => void; | ||
| >setItem : (item: I | null) => void | ||
| > : ^ ^^ ^^^^^ | ||
| >item : I | null | ||
| > : ^^^^^^^^ | ||
| } | ||
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| export interface DisableD<I extends Identifiable> { | ||
| readonly enableD: false; | ||
| >enableD : false | ||
| > : ^^^^^ | ||
| >false : false | ||
| > : ^^^^^ | ||
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| readonly value: I["id"]; | ||
| >value : I["id"] | ||
| > : ^^^^^^^ | ||
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| readonly setItem: (item: I) => void; | ||
| >setItem : (item: I) => void | ||
| > : ^ ^^ ^^^^^ | ||
| >item : I | ||
| > : ^ | ||
| } | ||
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| type MyComponentProps<I extends Identifiable> = (EnableA | DisableA) & | ||
| >MyComponentProps : (EnableA & EnableB & DisableD<I>) | (EnableA & EnableB & EnableD<I>) | (DisableA & EnableB & DisableD<I>) | (DisableA & EnableB & EnableD<I>) | (DisableA & DisableB & DisableD<I>) | (DisableA & DisableB & EnableD<I>) | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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| (EnableB | DisableB) & | ||
| (DisableD<I> | EnableD<I>); | ||
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| const MyComponent = <I extends Identifiable>(props: MyComponentProps<I>) => {}; | ||
| >MyComponent : <I extends Identifiable>(props: MyComponentProps<I>) => void | ||
| > : ^ ^^^^^^^^^ ^^ ^^ ^^^^^^^^^ | ||
| ><I extends Identifiable>(props: MyComponentProps<I>) => {} : <I extends Identifiable>(props: MyComponentProps<I>) => void | ||
| > : ^ ^^^^^^^^^ ^^ ^^ ^^^^^^^^^ | ||
| >props : (EnableA & EnableB & DisableD<I>) | (EnableA & EnableB & EnableD<I>) | (DisableA & EnableB & DisableD<I>) | (DisableA & EnableB & EnableD<I>) | (DisableA & DisableB & DisableD<I>) | (DisableA & DisableB & EnableD<I>) | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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| declare const item: string | null; | ||
| >item : string | null | ||
| > : ^^^^^^^^^^^^^ | ||
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| MyComponent({ | ||
| >MyComponent({ enableD: true, value: item, setItem: (item) => {},}) : void | ||
| > : ^^^^ | ||
| >MyComponent : <I extends Identifiable>(props: MyComponentProps<I>) => void | ||
| > : ^ ^^^^^^^^^ ^^ ^^ ^^^^^^^^^ | ||
| >{ enableD: true, value: item, setItem: (item) => {},} : { enableD: true; value: string | null; setItem: (item: Identifiable | null) => void; } | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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| enableD: true, | ||
| >enableD : true | ||
| > : ^^^^ | ||
| >true : true | ||
| > : ^^^^ | ||
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| value: item, | ||
| >value : string | null | ||
| > : ^^^^^^^^^^^^^ | ||
| >item : string | null | ||
| > : ^^^^^^^^^^^^^ | ||
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| setItem: (item) => {}, | ||
| >setItem : (item: Identifiable | null) => void | ||
| > : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >(item) => {} : (item: Identifiable | null) => void | ||
| > : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >item : Identifiable | null | ||
| > : ^^^^^^^^^^^^^^^^^^^ | ||
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| }); | ||
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51 changes: 51 additions & 0 deletions
51
tests/cases/compiler/contextuallyTypedByDiscriminableUnion2.ts
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| Original file line number | Diff line number | Diff line change | ||||
|---|---|---|---|---|---|---|
| @@ -0,0 +1,51 @@ | ||||||
| // @strict: true | ||||||
| // @noEmit: true | ||||||
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| // https://github.com/microsoft/TypeScript/issues/62256 | ||||||
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| type Identifiable = { id: string }; | ||||||
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| interface EnableA { | ||||||
| readonly enableA: true; | ||||||
| // this introduces a conflicting property with some of the other members of MyComponentProps | ||||||
| // making relevant final union members reduced nevers | ||||||
|
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This comment contains unclear language. 'reduced nevers' should be 'reduce to never' for grammatical correctness and clarity.
Suggested change
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| readonly enableB: true; | ||||||
| } | ||||||
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| interface DisableA { | ||||||
| readonly enableA?: false; | ||||||
| } | ||||||
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| interface EnableB { | ||||||
| readonly enableB?: true; | ||||||
| } | ||||||
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| interface DisableB { | ||||||
| readonly enableB: false; | ||||||
| } | ||||||
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| export interface EnableD<I extends Identifiable> { | ||||||
| readonly enableD: true; | ||||||
| readonly value: I["id"] | null; | ||||||
| readonly setItem: (item: I | null) => void; | ||||||
| } | ||||||
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| export interface DisableD<I extends Identifiable> { | ||||||
| readonly enableD: false; | ||||||
| readonly value: I["id"]; | ||||||
| readonly setItem: (item: I) => void; | ||||||
| } | ||||||
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| type MyComponentProps<I extends Identifiable> = (EnableA | DisableA) & | ||||||
| (EnableB | DisableB) & | ||||||
| (DisableD<I> | EnableD<I>); | ||||||
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| const MyComponent = <I extends Identifiable>(props: MyComponentProps<I>) => {}; | ||||||
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| declare const item: string | null; | ||||||
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| MyComponent({ | ||||||
| enableD: true, | ||||||
| value: item, | ||||||
| setItem: (item) => {}, | ||||||
| }); | ||||||
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The comment should be more specific about which members have conflicting properties and how this leads to never types. Consider explaining the specific conflict between EnableA requiring enableB: true and DisableB requiring enableB: false.
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