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Add tests
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‎tests/baselines/reference/tailRecursiveConditionalTypes.js

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//// [tailRecursiveConditionalTypes.ts]
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type Trim<S extends string> =
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S extends ` ${infer T}` ? Trim<T> :
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S extends `${infer T} ` ? Trim<T> :
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S;
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type T10 = Trim<' hello '>;
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type T11 = Trim<' hello '>;
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type GetChars<S> = GetCharsRec<S, never>;
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type GetCharsRec<S, Acc> =
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S extends `${infer Char}${infer Rest}` ? GetCharsRec<Rest, Char | Acc> : Acc;
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type T20 = GetChars<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>;
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type Reverse<T> = any[] extends T ? T : ReverseRec<T, []>;
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type ReverseRec<T, Acc extends unknown[]> =
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T extends [infer Head, ...infer Tail] ? ReverseRec<Tail, [Head, ...Acc]> : Acc;
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type T30 = Reverse<[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>;
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type T31 = Reverse<string[]>;
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type TupleOf<T, N extends number> = number extends N ? T[] : TupleOfRec<T, N, []>;
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type TupleOfRec<T, N extends number, Acc extends unknown[]> =
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Acc["length"] extends N ? Acc : TupleOfRec<T, N, [T, ...Acc]>;
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type T40 = TupleOf<any, 200>;
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type T41 = TupleOf<any, number>;
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//// [tailRecursiveConditionalTypes.js]
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"use strict";
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//// [tailRecursiveConditionalTypes.d.ts]
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declare type Trim<S extends string> = S extends ` ${infer T}` ? Trim<T> : S extends `${infer T} ` ? Trim<T> : S;
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declare type T10 = Trim<' hello '>;
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declare type T11 = Trim<' hello '>;
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declare type GetChars<S> = GetCharsRec<S, never>;
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declare type GetCharsRec<S, Acc> = S extends `${infer Char}${infer Rest}` ? GetCharsRec<Rest, Char | Acc> : Acc;
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declare type T20 = GetChars<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>;
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declare type Reverse<T> = any[] extends T ? T : ReverseRec<T, []>;
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declare type ReverseRec<T, Acc extends unknown[]> = T extends [infer Head, ...infer Tail] ? ReverseRec<Tail, [Head, ...Acc]> : Acc;
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declare type T30 = Reverse<[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>;
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declare type T31 = Reverse<string[]>;
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declare type TupleOf<T, N extends number> = number extends N ? T[] : TupleOfRec<T, N, []>;
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declare type TupleOfRec<T, N extends number, Acc extends unknown[]> = Acc["length"] extends N ? Acc : TupleOfRec<T, N, [T, ...Acc]>;
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declare type T40 = TupleOf<any, 200>;
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declare type T41 = TupleOf<any, number>;

‎tests/baselines/reference/tailRecursiveConditionalTypes.symbols

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=== tests/cases/compiler/tailRecursiveConditionalTypes.ts ===
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type Trim<S extends string> =
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>Trim : Symbol(Trim, Decl(tailRecursiveConditionalTypes.ts, 0, 0))
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 0, 10))
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S extends ` ${infer T}` ? Trim<T> :
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 0, 10))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 1, 23))
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>Trim : Symbol(Trim, Decl(tailRecursiveConditionalTypes.ts, 0, 0))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 1, 23))
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S extends `${infer T} ` ? Trim<T> :
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 0, 10))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 2, 22))
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>Trim : Symbol(Trim, Decl(tailRecursiveConditionalTypes.ts, 0, 0))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 2, 22))
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S;
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 0, 10))
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type T10 = Trim<' hello '>;
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>T10 : Symbol(T10, Decl(tailRecursiveConditionalTypes.ts, 3, 6))
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>Trim : Symbol(Trim, Decl(tailRecursiveConditionalTypes.ts, 0, 0))
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type T11 = Trim<' hello '>;
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>T11 : Symbol(T11, Decl(tailRecursiveConditionalTypes.ts, 5, 170))
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>Trim : Symbol(Trim, Decl(tailRecursiveConditionalTypes.ts, 0, 0))
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type GetChars<S> = GetCharsRec<S, never>;
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>GetChars : Symbol(GetChars, Decl(tailRecursiveConditionalTypes.ts, 6, 170))
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 8, 14))
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>GetCharsRec : Symbol(GetCharsRec, Decl(tailRecursiveConditionalTypes.ts, 8, 41))
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 8, 14))
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type GetCharsRec<S, Acc> =
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>GetCharsRec : Symbol(GetCharsRec, Decl(tailRecursiveConditionalTypes.ts, 8, 41))
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 9, 17))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 9, 19))
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S extends `${infer Char}${infer Rest}` ? GetCharsRec<Rest, Char | Acc> : Acc;
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>S : Symbol(S, Decl(tailRecursiveConditionalTypes.ts, 9, 17))
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>Char : Symbol(Char, Decl(tailRecursiveConditionalTypes.ts, 10, 22))
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>Rest : Symbol(Rest, Decl(tailRecursiveConditionalTypes.ts, 10, 35))
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>GetCharsRec : Symbol(GetCharsRec, Decl(tailRecursiveConditionalTypes.ts, 8, 41))
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>Rest : Symbol(Rest, Decl(tailRecursiveConditionalTypes.ts, 10, 35))
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>Char : Symbol(Char, Decl(tailRecursiveConditionalTypes.ts, 10, 22))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 9, 19))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 9, 19))
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type T20 = GetChars<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>;
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>T20 : Symbol(T20, Decl(tailRecursiveConditionalTypes.ts, 10, 81))
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>GetChars : Symbol(GetChars, Decl(tailRecursiveConditionalTypes.ts, 6, 170))
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type Reverse<T> = any[] extends T ? T : ReverseRec<T, []>;
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>Reverse : Symbol(Reverse, Decl(tailRecursiveConditionalTypes.ts, 12, 86))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 14, 13))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 14, 13))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 14, 13))
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>ReverseRec : Symbol(ReverseRec, Decl(tailRecursiveConditionalTypes.ts, 14, 58))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 14, 13))
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type ReverseRec<T, Acc extends unknown[]> =
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>ReverseRec : Symbol(ReverseRec, Decl(tailRecursiveConditionalTypes.ts, 14, 58))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 15, 16))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 15, 18))
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T extends [infer Head, ...infer Tail] ? ReverseRec<Tail, [Head, ...Acc]> : Acc;
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 15, 16))
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>Head : Symbol(Head, Decl(tailRecursiveConditionalTypes.ts, 16, 20))
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>Tail : Symbol(Tail, Decl(tailRecursiveConditionalTypes.ts, 16, 35))
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>ReverseRec : Symbol(ReverseRec, Decl(tailRecursiveConditionalTypes.ts, 14, 58))
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>Tail : Symbol(Tail, Decl(tailRecursiveConditionalTypes.ts, 16, 35))
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>Head : Symbol(Head, Decl(tailRecursiveConditionalTypes.ts, 16, 20))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 15, 18))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 15, 18))
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type T30 = Reverse<[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>;
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>T30 : Symbol(T30, Decl(tailRecursiveConditionalTypes.ts, 16, 83))
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>Reverse : Symbol(Reverse, Decl(tailRecursiveConditionalTypes.ts, 12, 86))
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type T31 = Reverse<string[]>;
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>T31 : Symbol(T31, Decl(tailRecursiveConditionalTypes.ts, 18, 171))
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>Reverse : Symbol(Reverse, Decl(tailRecursiveConditionalTypes.ts, 12, 86))
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type TupleOf<T, N extends number> = number extends N ? T[] : TupleOfRec<T, N, []>;
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>TupleOf : Symbol(TupleOf, Decl(tailRecursiveConditionalTypes.ts, 19, 29))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 21, 13))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 21, 15))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 21, 15))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 21, 13))
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>TupleOfRec : Symbol(TupleOfRec, Decl(tailRecursiveConditionalTypes.ts, 21, 82))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 21, 13))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 21, 15))
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type TupleOfRec<T, N extends number, Acc extends unknown[]> =
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>TupleOfRec : Symbol(TupleOfRec, Decl(tailRecursiveConditionalTypes.ts, 21, 82))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 22, 16))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 22, 18))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 22, 36))
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Acc["length"] extends N ? Acc : TupleOfRec<T, N, [T, ...Acc]>;
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 22, 36))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 22, 18))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 22, 36))
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>TupleOfRec : Symbol(TupleOfRec, Decl(tailRecursiveConditionalTypes.ts, 21, 82))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 22, 16))
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>N : Symbol(N, Decl(tailRecursiveConditionalTypes.ts, 22, 18))
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>T : Symbol(T, Decl(tailRecursiveConditionalTypes.ts, 22, 16))
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>Acc : Symbol(Acc, Decl(tailRecursiveConditionalTypes.ts, 22, 36))
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type T40 = TupleOf<any, 200>;
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>T40 : Symbol(T40, Decl(tailRecursiveConditionalTypes.ts, 23, 66))
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>TupleOf : Symbol(TupleOf, Decl(tailRecursiveConditionalTypes.ts, 19, 29))
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type T41 = TupleOf<any, number>;
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>T41 : Symbol(T41, Decl(tailRecursiveConditionalTypes.ts, 25, 29))
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>TupleOf : Symbol(TupleOf, Decl(tailRecursiveConditionalTypes.ts, 19, 29))
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‎tests/baselines/reference/tailRecursiveConditionalTypes.types

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=== tests/cases/compiler/tailRecursiveConditionalTypes.ts ===
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type Trim<S extends string> =
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>Trim : Trim<S>
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S extends ` ${infer T}` ? Trim<T> :
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S extends `${infer T} ` ? Trim<T> :
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S;
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type T10 = Trim<' hello '>;
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>T10 : "hello"
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type T11 = Trim<' hello '>;
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>T11 : "hello"
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type GetChars<S> = GetCharsRec<S, never>;
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>GetChars : GetChars<S>
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type GetCharsRec<S, Acc> =
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>GetCharsRec : GetCharsRec<S, Acc>
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S extends `${infer Char}${infer Rest}` ? GetCharsRec<Rest, Char | Acc> : Acc;
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type T20 = GetChars<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>;
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>T20 : "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" | "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z" | "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
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type Reverse<T> = any[] extends T ? T : ReverseRec<T, []>;
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>Reverse : Reverse<T>
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type ReverseRec<T, Acc extends unknown[]> =
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>ReverseRec : ReverseRec<T, Acc>
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T extends [infer Head, ...infer Tail] ? ReverseRec<Tail, [Head, ...Acc]> : Acc;
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type T30 = Reverse<[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>;
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>T30 : [9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
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type T31 = Reverse<string[]>;
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>T31 : string[]
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type TupleOf<T, N extends number> = number extends N ? T[] : TupleOfRec<T, N, []>;
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>TupleOf : TupleOf<T, N>
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type TupleOfRec<T, N extends number, Acc extends unknown[]> =
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>TupleOfRec : TupleOfRec<T, N, Acc>
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Acc["length"] extends N ? Acc : TupleOfRec<T, N, [T, ...Acc]>;
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type T40 = TupleOf<any, 200>;
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>T40 : [any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any, any]
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type T41 = TupleOf<any, number>;
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>T41 : any[]
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‎tests/cases/compiler/tailRecursiveConditionalTypes.ts

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// @strict: true
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// @declaration: true
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type Trim<S extends string> =
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S extends ` ${infer T}` ? Trim<T> :
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S extends `${infer T} ` ? Trim<T> :
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S;
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type T10 = Trim<' hello '>;
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type T11 = Trim<' hello '>;
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type GetChars<S> = GetCharsRec<S, never>;
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type GetCharsRec<S, Acc> =
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S extends `${infer Char}${infer Rest}` ? GetCharsRec<Rest, Char | Acc> : Acc;
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type T20 = GetChars<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>;
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type Reverse<T> = any[] extends T ? T : ReverseRec<T, []>;
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type ReverseRec<T, Acc extends unknown[]> =
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T extends [infer Head, ...infer Tail] ? ReverseRec<Tail, [Head, ...Acc]> : Acc;
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type T30 = Reverse<[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>;
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type T31 = Reverse<string[]>;
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type TupleOf<T, N extends number> = number extends N ? T[] : TupleOfRec<T, N, []>;
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type TupleOfRec<T, N extends number, Acc extends unknown[]> =
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Acc["length"] extends N ? Acc : TupleOfRec<T, N, [T, ...Acc]>;
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type T40 = TupleOf<any, 200>;
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type T41 = TupleOf<any, number>;

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