assign error to method definition node if a return type is empty (#35309)

Author: a-tarasyuk

src/compiler/checker.ts

@@ -26102,7 +26102,7 @@ namespace ts {
                 error(getEffectiveReturnTypeNode(func), Diagnostics.A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value);
             }
             else if (type && strictNullChecks && !isTypeAssignableTo(undefinedType, type)) {
-                error(getEffectiveReturnTypeNode(func), Diagnostics.Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined);
+                error(getEffectiveReturnTypeNode(func) || func, Diagnostics.Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined);
             }
             else if (compilerOptions.noImplicitReturns) {
                 if (!type) {

tests/baselines/reference/getterControlFlowStrictNull.errors.txt

@@ -1,8 +1,9 @@
 tests/cases/compiler/getterControlFlowStrictNull.ts(2,9): error TS2366: Function lacks ending return statement and return type does not include 'undefined'.
 tests/cases/compiler/getterControlFlowStrictNull.ts(11,14): error TS2366: Function lacks ending return statement and return type does not include 'undefined'.
+tests/cases/compiler/getterControlFlowStrictNull.ts(20,9): error TS2366: Function lacks ending return statement and return type does not include 'undefined'.
 
 
-==== tests/cases/compiler/getterControlFlowStrictNull.ts (2 errors) ====
+==== tests/cases/compiler/getterControlFlowStrictNull.ts (3 errors) ====
     class A {
        a(): string | null {
             ~~~~~~~~~~~~~
@@ -24,4 +25,18 @@ tests/cases/compiler/getterControlFlowStrictNull.ts(11,14): error TS2366: Functi
 
             // it should error here because it returns undefined
         }
+    }
+    class C {
+        get a() {
+            ~
+!!! error TS2366: Function lacks ending return statement and return type does not include 'undefined'.
+            if (Math.random() > 0.5) {
+                return 0;
+            }
+    
+            // it should error here because it returns undefined
+        }
+    
+        set a(value: number) {
+        }
     }

tests/baselines/reference/getterControlFlowStrictNull.js

@@ -16,6 +16,18 @@ class B {
 
         // it should error here because it returns undefined
     }
+}
+class C {
+    get a() {
+        if (Math.random() > 0.5) {
+            return 0;
+        }
+
+        // it should error here because it returns undefined
+    }
+
+    set a(value: number) {
+    }
 }
 
 //// [getterControlFlowStrictNull.js]
@@ -45,3 +57,20 @@ var B = /** @class */ (function () {
     });
     return B;
 }());
+var C = /** @class */ (function () {
+    function C() {
+    }
+    Object.defineProperty(C.prototype, "a", {
+        get: function () {
+            if (Math.random() > 0.5) {
+                return 0;
+            }
+            // it should error here because it returns undefined
+        },
+        set: function (value) {
+        },
+        enumerable: true,
+        configurable: true
+    });
+    return C;
+}());

tests/baselines/reference/getterControlFlowStrictNull.symbols

@@ -33,3 +33,25 @@ class B {
         // it should error here because it returns undefined
     }
 }
+class C {
+>C : Symbol(C, Decl(getterControlFlowStrictNull.ts, 17, 1))
+
+    get a() {
+>a : Symbol(C.a, Decl(getterControlFlowStrictNull.ts, 18, 9), Decl(getterControlFlowStrictNull.ts, 25, 5))
+
+        if (Math.random() > 0.5) {
+>Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+
+            return 0;
+        }
+
+        // it should error here because it returns undefined
+    }
+
+    set a(value: number) {
+>a : Symbol(C.a, Decl(getterControlFlowStrictNull.ts, 18, 9), Decl(getterControlFlowStrictNull.ts, 25, 5))
+>value : Symbol(value, Decl(getterControlFlowStrictNull.ts, 27, 10))
+    }
+}

tests/baselines/reference/getterControlFlowStrictNull.types

@@ -43,3 +43,29 @@ class B {
         // it should error here because it returns undefined
     }
 }
+class C {
+>C : C
+
+    get a() {
+>a : number
+
+        if (Math.random() > 0.5) {
+>Math.random() > 0.5 : boolean
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+>0.5 : 0.5
+
+            return 0;
+>0 : 0
+        }
+
+        // it should error here because it returns undefined
+    }
+
+    set a(value: number) {
+>a : number
+>value : number
+    }
+}

tests/cases/compiler/getterControlFlowStrictNull.ts

@@ -17,4 +17,16 @@ class B {
 
         // it should error here because it returns undefined
     }
+}
+class C {
+    get a() {
+        if (Math.random() > 0.5) {
+            return 0;
+        }
+
+        // it should error here because it returns undefined
+    }
+
+    set a(value: number) {
+    }
 }