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Add extra tests for recursive conditional types (#54030)
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‎tests/baselines/reference/recursiveConditionalTypes2.symbols

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=== tests/cases/compiler/recursiveConditionalTypes2.ts ===
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// repro from https://github.com/microsoft/TypeScript/issues/43877
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type UnionToIntersection<U> = (
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>UnionToIntersection : Symbol(UnionToIntersection, Decl(recursiveConditionalTypes2.ts, 0, 0))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 2, 25))
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U extends any ? (k: U) => unknown : never
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 2, 25))
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>k : Symbol(k, Decl(recursiveConditionalTypes2.ts, 3, 19))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 2, 25))
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) extends (k: infer I) => unknown
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>k : Symbol(k, Decl(recursiveConditionalTypes2.ts, 4, 11))
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>I : Symbol(I, Decl(recursiveConditionalTypes2.ts, 4, 19))
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? I
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>I : Symbol(I, Decl(recursiveConditionalTypes2.ts, 4, 19))
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: never;
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interface ClassSpec {
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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public?: object;
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>public : Symbol(ClassSpec.public, Decl(recursiveConditionalTypes2.ts, 8, 21))
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private?: object;
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>private : Symbol(ClassSpec.private, Decl(recursiveConditionalTypes2.ts, 9, 18))
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publicExtends?: Record<string, ClassSpec>;
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>publicExtends : Symbol(ClassSpec.publicExtends, Decl(recursiveConditionalTypes2.ts, 10, 19))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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privateExtends?: Record<string, ClassSpec>;
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>privateExtends : Symbol(ClassSpec.privateExtends, Decl(recursiveConditionalTypes2.ts, 11, 44))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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}
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type MaybeMergePrivateSuperSpec<T> = T extends Record<string, ClassSpec>
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>MaybeMergePrivateSuperSpec : Symbol(MaybeMergePrivateSuperSpec, Decl(recursiveConditionalTypes2.ts, 13, 1))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 15, 32))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 15, 32))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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? MergePrivateSuperSpec<T>
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>MergePrivateSuperSpec : Symbol(MergePrivateSuperSpec, Decl(recursiveConditionalTypes2.ts, 26, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 15, 32))
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: {};
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type MaybeMergePrivateSpecs<T extends ClassSpec, U> = U extends ClassSpec
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>MaybeMergePrivateSpecs : Symbol(MaybeMergePrivateSpecs, Decl(recursiveConditionalTypes2.ts, 17, 7))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 19, 28))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 19, 48))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 19, 48))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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? MergePrivateSpecs<U, T>
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>MergePrivateSpecs : Symbol(MergePrivateSpecs, Decl(recursiveConditionalTypes2.ts, 21, 6))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 19, 48))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 19, 28))
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: T;
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 19, 28))
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type MergePrivateSpecs<T extends ClassSpec, U extends ClassSpec> = {
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>MergePrivateSpecs : Symbol(MergePrivateSpecs, Decl(recursiveConditionalTypes2.ts, 21, 6))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 23, 23))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 23, 43))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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public: T["public"] & U["public"];
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>public : Symbol(public, Decl(recursiveConditionalTypes2.ts, 23, 68))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 23, 23))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 23, 43))
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private: T["private"] & U["private"];
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>private : Symbol(private, Decl(recursiveConditionalTypes2.ts, 24, 36))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 23, 23))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 23, 43))
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};
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type MergePrivateSuperSpec<T extends Record<string, ClassSpec>> =
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>MergePrivateSuperSpec : Symbol(MergePrivateSuperSpec, Decl(recursiveConditionalTypes2.ts, 26, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 28, 27))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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UnionToIntersection<
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>UnionToIntersection : Symbol(UnionToIntersection, Decl(recursiveConditionalTypes2.ts, 0, 0))
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{
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[P in keyof T]: SimplifyPrivateSpec<T[P]>;
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 31, 7))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 28, 27))
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>SimplifyPrivateSpec : Symbol(SimplifyPrivateSpec, Decl(recursiveConditionalTypes2.ts, 33, 4))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 28, 27))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 31, 7))
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}[keyof T]
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 28, 27))
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>;
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export type SimplifyPrivateSpec<T extends ClassSpec> = MaybeMergePrivateSpecs<
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>SimplifyPrivateSpec : Symbol(SimplifyPrivateSpec, Decl(recursiveConditionalTypes2.ts, 33, 4))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 35, 32))
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>ClassSpec : Symbol(ClassSpec, Decl(recursiveConditionalTypes2.ts, 6, 10))
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>MaybeMergePrivateSpecs : Symbol(MaybeMergePrivateSpecs, Decl(recursiveConditionalTypes2.ts, 17, 7))
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MaybeMergePrivateSpecs<T, MaybeMergePrivateSuperSpec<T["publicExtends"]>>,
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>MaybeMergePrivateSpecs : Symbol(MaybeMergePrivateSpecs, Decl(recursiveConditionalTypes2.ts, 17, 7))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 35, 32))
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>MaybeMergePrivateSuperSpec : Symbol(MaybeMergePrivateSuperSpec, Decl(recursiveConditionalTypes2.ts, 13, 1))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 35, 32))
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MaybeMergePrivateSuperSpec<T["privateExtends"]>
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>MaybeMergePrivateSuperSpec : Symbol(MaybeMergePrivateSuperSpec, Decl(recursiveConditionalTypes2.ts, 13, 1))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 35, 32))
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>;
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// repro from https://github.com/microsoft/TypeScript/issues/43877#issuecomment-866146516
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type Converted<T> = {
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>Converted : Symbol(Converted, Decl(recursiveConditionalTypes2.ts, 38, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 42, 15))
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[P in keyof T]: null extends T[P] ? T[P] : T[P];
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 43, 3))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 42, 15))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 42, 15))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 43, 3))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 42, 15))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 43, 3))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 42, 15))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 43, 3))
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};
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type DefaultsDeep<T, U extends T> = {
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>DefaultsDeep : Symbol(DefaultsDeep, Decl(recursiveConditionalTypes2.ts, 44, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 46, 20))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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[P in keyof T]-?: U[P] extends T[P]
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 46, 20))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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? null extends U[P]
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 46, 20))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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? Converted<DefaultsDeep<T[P], NonNullable<U[P]>>>
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>Converted : Symbol(Converted, Decl(recursiveConditionalTypes2.ts, 38, 2))
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>DefaultsDeep : Symbol(DefaultsDeep, Decl(recursiveConditionalTypes2.ts, 44, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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>NonNullable : Symbol(NonNullable, Decl(lib.es5.d.ts, --, --))
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>U : Symbol(U, Decl(recursiveConditionalTypes2.ts, 46, 20))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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: T[P]
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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: T[P];
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 46, 18))
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>P : Symbol(P, Decl(recursiveConditionalTypes2.ts, 47, 3))
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};
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interface _Array<T> {
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>_Array : Symbol(_Array, Decl(recursiveConditionalTypes2.ts, 52, 2))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 54, 17))
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find<S extends T>(predicate: (value: T) => boolean): void;
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>find : Symbol(_Array.find, Decl(recursiveConditionalTypes2.ts, 54, 21))
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>S : Symbol(S, Decl(recursiveConditionalTypes2.ts, 55, 7))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 54, 17))
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>predicate : Symbol(predicate, Decl(recursiveConditionalTypes2.ts, 55, 20))
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>value : Symbol(value, Decl(recursiveConditionalTypes2.ts, 55, 32))
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>T : Symbol(T, Decl(recursiveConditionalTypes2.ts, 54, 17))
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}
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const z: _Array<DefaultsDeep<{}, {}>> = [];
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>z : Symbol(z, Decl(recursiveConditionalTypes2.ts, 58, 5))
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>_Array : Symbol(_Array, Decl(recursiveConditionalTypes2.ts, 52, 2))
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>DefaultsDeep : Symbol(DefaultsDeep, Decl(recursiveConditionalTypes2.ts, 44, 2))
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z.find((_) => true);
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>z.find : Symbol(_Array.find, Decl(recursiveConditionalTypes2.ts, 54, 21))
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>z : Symbol(z, Decl(recursiveConditionalTypes2.ts, 58, 5))
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>find : Symbol(_Array.find, Decl(recursiveConditionalTypes2.ts, 54, 21))
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>_ : Symbol(_, Decl(recursiveConditionalTypes2.ts, 60, 8))
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‎tests/baselines/reference/recursiveConditionalTypes2.types

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=== tests/cases/compiler/recursiveConditionalTypes2.ts ===
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// repro from https://github.com/microsoft/TypeScript/issues/43877
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type UnionToIntersection<U> = (
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>UnionToIntersection : UnionToIntersection<U>
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U extends any ? (k: U) => unknown : never
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>k : U
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) extends (k: infer I) => unknown
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>k : I
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? I
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: never;
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interface ClassSpec {
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public?: object;
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>public : object | undefined
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private?: object;
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>private : object | undefined
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publicExtends?: Record<string, ClassSpec>;
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>publicExtends : Record<string, ClassSpec> | undefined
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privateExtends?: Record<string, ClassSpec>;
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>privateExtends : Record<string, ClassSpec> | undefined
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}
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type MaybeMergePrivateSuperSpec<T> = T extends Record<string, ClassSpec>
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>MaybeMergePrivateSuperSpec : MaybeMergePrivateSuperSpec<T>
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? MergePrivateSuperSpec<T>
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: {};
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type MaybeMergePrivateSpecs<T extends ClassSpec, U> = U extends ClassSpec
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>MaybeMergePrivateSpecs : MaybeMergePrivateSpecs<T, U>
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? MergePrivateSpecs<U, T>
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: T;
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type MergePrivateSpecs<T extends ClassSpec, U extends ClassSpec> = {
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>MergePrivateSpecs : MergePrivateSpecs<T, U>
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public: T["public"] & U["public"];
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>public : T["public"] & U["public"]
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private: T["private"] & U["private"];
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>private : T["private"] & U["private"]
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};
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type MergePrivateSuperSpec<T extends Record<string, ClassSpec>> =
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>MergePrivateSuperSpec : MergePrivateSuperSpec<T>
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UnionToIntersection<
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{
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[P in keyof T]: SimplifyPrivateSpec<T[P]>;
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}[keyof T]
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>;
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export type SimplifyPrivateSpec<T extends ClassSpec> = MaybeMergePrivateSpecs<
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>SimplifyPrivateSpec : SimplifyPrivateSpec<T>
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MaybeMergePrivateSpecs<T, MaybeMergePrivateSuperSpec<T["publicExtends"]>>,
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MaybeMergePrivateSuperSpec<T["privateExtends"]>
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>;
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// repro from https://github.com/microsoft/TypeScript/issues/43877#issuecomment-866146516
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type Converted<T> = {
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>Converted : Converted<T>
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[P in keyof T]: null extends T[P] ? T[P] : T[P];
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};
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type DefaultsDeep<T, U extends T> = {
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>DefaultsDeep : DefaultsDeep<T, U>
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[P in keyof T]-?: U[P] extends T[P]
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? null extends U[P]
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? Converted<DefaultsDeep<T[P], NonNullable<U[P]>>>
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: T[P]
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: T[P];
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};
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interface _Array<T> {
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find<S extends T>(predicate: (value: T) => boolean): void;
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>find : <S extends T>(predicate: (value: T) => boolean) => void
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>predicate : (value: T) => boolean
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>value : T
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}
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const z: _Array<DefaultsDeep<{}, {}>> = [];
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>z : _Array<DefaultsDeep<{}, {}>>
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>[] : never[]
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z.find((_) => true);
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>z.find((_) => true) : void
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>z.find : <S extends DefaultsDeep<{}, {}>>(predicate: (value: DefaultsDeep<{}, {}>) => boolean) => void
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>z : _Array<DefaultsDeep<{}, {}>>
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>find : <S extends DefaultsDeep<{}, {}>>(predicate: (value: DefaultsDeep<{}, {}>) => boolean) => void
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>(_) => true : (_: DefaultsDeep<{}, {}>) => true
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>_ : DefaultsDeep<{}, {}>
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>true : true
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‎tests/cases/compiler/recursiveConditionalTypes2.ts

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// @strict: true
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// @lib: esnext
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// @noEmit: true
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// repro from https://github.com/microsoft/TypeScript/issues/43877
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type UnionToIntersection<U> = (
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U extends any ? (k: U) => unknown : never
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) extends (k: infer I) => unknown
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? I
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: never;
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interface ClassSpec {
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public?: object;
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private?: object;
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publicExtends?: Record<string, ClassSpec>;
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privateExtends?: Record<string, ClassSpec>;
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}
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type MaybeMergePrivateSuperSpec<T> = T extends Record<string, ClassSpec>
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? MergePrivateSuperSpec<T>
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: {};
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type MaybeMergePrivateSpecs<T extends ClassSpec, U> = U extends ClassSpec
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? MergePrivateSpecs<U, T>
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: T;
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type MergePrivateSpecs<T extends ClassSpec, U extends ClassSpec> = {
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public: T["public"] & U["public"];
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private: T["private"] & U["private"];
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};
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type MergePrivateSuperSpec<T extends Record<string, ClassSpec>> =
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UnionToIntersection<
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{
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[P in keyof T]: SimplifyPrivateSpec<T[P]>;
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}[keyof T]
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>;
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export type SimplifyPrivateSpec<T extends ClassSpec> = MaybeMergePrivateSpecs<
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MaybeMergePrivateSpecs<T, MaybeMergePrivateSuperSpec<T["publicExtends"]>>,
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MaybeMergePrivateSuperSpec<T["privateExtends"]>
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>;
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// repro from https://github.com/microsoft/TypeScript/issues/43877#issuecomment-866146516
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type Converted<T> = {
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[P in keyof T]: null extends T[P] ? T[P] : T[P];
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};
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type DefaultsDeep<T, U extends T> = {
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[P in keyof T]-?: U[P] extends T[P]
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? null extends U[P]
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? Converted<DefaultsDeep<T[P], NonNullable<U[P]>>>
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: T[P]
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: T[P];
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};
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interface _Array<T> {
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find<S extends T>(predicate: (value: T) => boolean): void;
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}
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const z: _Array<DefaultsDeep<{}, {}>> = [];
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z.find((_) => true);

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