Add regression test

tests/baselines/reference/mappedTypeNestedGenericInstantiation.js

@@ -0,0 +1,19 @@
+//// [mappedTypeNestedGenericInstantiation.ts]
+// Repro from #13346
+
+interface Chainable<T> {
+  value(): T;
+  mapValues<U>(func: (v: T[keyof T]) => U): Chainable<{[k in keyof T]: U}>;
+}
+
+declare function chain<T>(t: T): Chainable<T>;
+
+const square = (x: number) => x * x;
+
+const v = chain({a: 1, b: 2}).mapValues(square).value();
+
+
+//// [mappedTypeNestedGenericInstantiation.js]
+// Repro from #13346
+var square = function (x) { return x * x; };
+var v = chain({ a: 1, b: 2 }).mapValues(square).value();

tests/baselines/reference/mappedTypeNestedGenericInstantiation.symbols

@@ -0,0 +1,50 @@
+=== tests/cases/compiler/mappedTypeNestedGenericInstantiation.ts ===
+// Repro from #13346
+
+interface Chainable<T> {
+>Chainable : Symbol(Chainable, Decl(mappedTypeNestedGenericInstantiation.ts, 0, 0))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 20))
+
+  value(): T;
+>value : Symbol(Chainable.value, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 24))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 20))
+
+  mapValues<U>(func: (v: T[keyof T]) => U): Chainable<{[k in keyof T]: U}>;
+>mapValues : Symbol(Chainable.mapValues, Decl(mappedTypeNestedGenericInstantiation.ts, 3, 13))
+>U : Symbol(U, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 12))
+>func : Symbol(func, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 15))
+>v : Symbol(v, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 22))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 20))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 20))
+>U : Symbol(U, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 12))
+>Chainable : Symbol(Chainable, Decl(mappedTypeNestedGenericInstantiation.ts, 0, 0))
+>k : Symbol(k, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 56))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 20))
+>U : Symbol(U, Decl(mappedTypeNestedGenericInstantiation.ts, 4, 12))
+}
+
+declare function chain<T>(t: T): Chainable<T>;
+>chain : Symbol(chain, Decl(mappedTypeNestedGenericInstantiation.ts, 5, 1))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 7, 23))
+>t : Symbol(t, Decl(mappedTypeNestedGenericInstantiation.ts, 7, 26))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 7, 23))
+>Chainable : Symbol(Chainable, Decl(mappedTypeNestedGenericInstantiation.ts, 0, 0))
+>T : Symbol(T, Decl(mappedTypeNestedGenericInstantiation.ts, 7, 23))
+
+const square = (x: number) => x * x;
+>square : Symbol(square, Decl(mappedTypeNestedGenericInstantiation.ts, 9, 5))
+>x : Symbol(x, Decl(mappedTypeNestedGenericInstantiation.ts, 9, 16))
+>x : Symbol(x, Decl(mappedTypeNestedGenericInstantiation.ts, 9, 16))
+>x : Symbol(x, Decl(mappedTypeNestedGenericInstantiation.ts, 9, 16))
+
+const v = chain({a: 1, b: 2}).mapValues(square).value();
+>v : Symbol(v, Decl(mappedTypeNestedGenericInstantiation.ts, 11, 5))
+>chain({a: 1, b: 2}).mapValues(square).value : Symbol(Chainable.value, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 24))
+>chain({a: 1, b: 2}).mapValues : Symbol(Chainable.mapValues, Decl(mappedTypeNestedGenericInstantiation.ts, 3, 13))
+>chain : Symbol(chain, Decl(mappedTypeNestedGenericInstantiation.ts, 5, 1))
+>a : Symbol(a, Decl(mappedTypeNestedGenericInstantiation.ts, 11, 17))
+>b : Symbol(b, Decl(mappedTypeNestedGenericInstantiation.ts, 11, 22))
+>mapValues : Symbol(Chainable.mapValues, Decl(mappedTypeNestedGenericInstantiation.ts, 3, 13))
+>square : Symbol(square, Decl(mappedTypeNestedGenericInstantiation.ts, 9, 5))
+>value : Symbol(Chainable.value, Decl(mappedTypeNestedGenericInstantiation.ts, 2, 24))
+

tests/baselines/reference/mappedTypeNestedGenericInstantiation.types

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+=== tests/cases/compiler/mappedTypeNestedGenericInstantiation.ts ===
+// Repro from #13346
+
+interface Chainable<T> {
+>Chainable : Chainable<T>
+>T : T
+
+  value(): T;
+>value : () => T
+>T : T
+
+  mapValues<U>(func: (v: T[keyof T]) => U): Chainable<{[k in keyof T]: U}>;
+>mapValues : <U>(func: (v: T[keyof T]) => U) => Chainable<{ [k in keyof T]: U; }>
+>U : U
+>func : (v: T[keyof T]) => U
+>v : T[keyof T]
+>T : T
+>T : T
+>U : U
+>Chainable : Chainable<T>
+>k : k
+>T : T
+>U : U
+}
+
+declare function chain<T>(t: T): Chainable<T>;
+>chain : <T>(t: T) => Chainable<T>
+>T : T
+>t : T
+>T : T
+>Chainable : Chainable<T>
+>T : T
+
+const square = (x: number) => x * x;
+>square : (x: number) => number
+>(x: number) => x * x : (x: number) => number
+>x : number
+>x * x : number
+>x : number
+>x : number
+
+const v = chain({a: 1, b: 2}).mapValues(square).value();
+>v : { a: number; b: number; }
+>chain({a: 1, b: 2}).mapValues(square).value() : { a: number; b: number; }
+>chain({a: 1, b: 2}).mapValues(square).value : () => { a: number; b: number; }
+>chain({a: 1, b: 2}).mapValues(square) : Chainable<{ a: number; b: number; }>
+>chain({a: 1, b: 2}).mapValues : <U>(func: (v: number) => U) => Chainable<{ a: U; b: U; }>
+>chain({a: 1, b: 2}) : Chainable<{ a: number; b: number; }>
+>chain : <T>(t: T) => Chainable<T>
+>{a: 1, b: 2} : { a: number; b: number; }
+>a : number
+>1 : 1
+>b : number
+>2 : 2
+>mapValues : <U>(func: (v: number) => U) => Chainable<{ a: U; b: U; }>
+>square : (x: number) => number
+>value : () => { a: number; b: number; }
+

tests/cases/compiler/mappedTypeNestedGenericInstantiation.ts

@@ -0,0 +1,12 @@
+// Repro from #13346
+
+interface Chainable<T> {
+  value(): T;
+  mapValues<U>(func: (v: T[keyof T]) => U): Chainable<{[k in keyof T]: U}>;
+}
+
+declare function chain<T>(t: T): Chainable<T>;
+
+const square = (x: number) => x * x;
+
+const v = chain({a: 1, b: 2}).mapValues(square).value();