add test case and fix regression

src/compiler/checker.ts

@@ -1211,8 +1211,8 @@ namespace ts {
                                     : false;
                             }
                             if (meaning & SymbolFlags.Value && result.flags & SymbolFlags.Variable) {
-                                // parameter initializer will lookup as normal variable scope when targeting es2015+
-                                if (compilerOptions.target && compilerOptions.target >= ScriptTarget.ES2015 && isParameter(lastLocation) && result.valueDeclaration !== lastLocation) {
+                                // expression inside parameter will lookup as normal variable scope when targeting es2015+
+                                if (compilerOptions.target && compilerOptions.target >= ScriptTarget.ES2015 && isParameter(lastLocation) && !isParameterPropertyDeclaration(lastLocation) && result.valueDeclaration !== lastLocation) {
                                     useResult = false;
                                 }
                                 else if (result.flags & SymbolFlags.FunctionScopedVariable) {

tests/baselines/reference/parameterInitializersForwardReferencing1.errors.txt

@@ -51,4 +51,8 @@ tests/cases/conformance/functions/parameterInitializersForwardReferencing1.ts(29
 !!! related TS2728 tests/cases/conformance/functions/parameterInitializersForwardReferencing1.ts:30:9: 'foo' is declared here.
         let foo: number = 2;
     }
+
+    class Foo {
+        constructor(public x = 12, public y = x) {}
+    }
 

tests/baselines/reference/parameterInitializersForwardReferencing1.js

@@ -30,6 +30,10 @@ function f6 (async = async) {
 function f7({[foo]: bar}: any[]) {
     let foo: number = 2;
 }
+
+class Foo {
+    constructor(public x = 12, public y = x) {}
+}
 
 
 //// [parameterInitializersForwardReferencing1.js]
@@ -68,3 +72,12 @@ function f7(_a) {
     var _b = foo, bar = _a[_b];
     var foo = 2;
 }
+var Foo = /** @class */ (function () {
+    function Foo(x, y) {
+        if (x === void 0) { x = 12; }
+        if (y === void 0) { y = x; }
+        this.x = x;
+        this.y = y;
+    }
+    return Foo;
+}());

tests/baselines/reference/parameterInitializersForwardReferencing1.symbols

@@ -75,3 +75,12 @@ function f7({[foo]: bar}: any[]) {
 >foo : Symbol(foo, Decl(parameterInitializersForwardReferencing1.ts, 29, 7))
 }
 
+class Foo {
+>Foo : Symbol(Foo, Decl(parameterInitializersForwardReferencing1.ts, 30, 1))
+
+    constructor(public x = 12, public y = x) {}
+>x : Symbol(Foo.x, Decl(parameterInitializersForwardReferencing1.ts, 33, 16))
+>y : Symbol(Foo.y, Decl(parameterInitializersForwardReferencing1.ts, 33, 30))
+>x : Symbol(x, Decl(parameterInitializersForwardReferencing1.ts, 33, 16))
+}
+

tests/baselines/reference/parameterInitializersForwardReferencing1.types

@@ -82,3 +82,13 @@ function f7({[foo]: bar}: any[]) {
 >2 : 2
 }
 
+class Foo {
+>Foo : Foo
+
+    constructor(public x = 12, public y = x) {}
+>x : number
+>12 : 12
+>y : number
+>x : number
+}
+

tests/baselines/reference/parameterInitializersForwardReferencing1_es6.errors.txt

@@ -38,4 +38,8 @@ tests/cases/conformance/functions/parameterInitializersForwardReferencing1_es6.t
     function f7({[foo]: bar}: any[]) {
         let foo: number = 2;
     }
+
+    class Foo {
+        constructor(public x = 12, public y = x) {}
+    }
 

tests/baselines/reference/parameterInitializersForwardReferencing1_es6.js

@@ -30,6 +30,10 @@ function f6 (async = async) {
 function f7({[foo]: bar}: any[]) {
     let foo: number = 2;
 }
+
+class Foo {
+    constructor(public x = 12, public y = x) {}
+}
 
 
 //// [parameterInitializersForwardReferencing1_es6.js]
@@ -57,3 +61,9 @@ function f6(async = async) {
 function f7({ [foo]: bar }) {
     let foo = 2;
 }
+class Foo {
+    constructor(x = 12, y = x) {
+        this.x = x;
+        this.y = y;
+    }
+}

tests/baselines/reference/parameterInitializersForwardReferencing1_es6.symbols

@@ -75,3 +75,12 @@ function f7({[foo]: bar}: any[]) {
 >foo : Symbol(foo, Decl(parameterInitializersForwardReferencing1_es6.ts, 29, 7))
 }
 
+class Foo {
+>Foo : Symbol(Foo, Decl(parameterInitializersForwardReferencing1_es6.ts, 30, 1))
+
+    constructor(public x = 12, public y = x) {}
+>x : Symbol(Foo.x, Decl(parameterInitializersForwardReferencing1_es6.ts, 33, 16))
+>y : Symbol(Foo.y, Decl(parameterInitializersForwardReferencing1_es6.ts, 33, 30))
+>x : Symbol(x, Decl(parameterInitializersForwardReferencing1_es6.ts, 33, 16))
+}
+

tests/baselines/reference/parameterInitializersForwardReferencing1_es6.types

@@ -82,3 +82,13 @@ function f7({[foo]: bar}: any[]) {
 >2 : 2
 }
 
+class Foo {
+>Foo : Foo
+
+    constructor(public x = 12, public y = x) {}
+>x : number
+>12 : 12
+>y : number
+>x : number
+}
+

tests/cases/conformance/functions/parameterInitializersForwardReferencing1.ts

@@ -29,3 +29,7 @@ function f6 (async = async) {
 function f7({[foo]: bar}: any[]) {
     let foo: number = 2;
 }
+
+class Foo {
+    constructor(public x = 12, public y = x) {}
+}

tests/cases/conformance/functions/parameterInitializersForwardReferencing1_es6.ts

@@ -31,3 +31,7 @@ function f6 (async = async) {
 function f7({[foo]: bar}: any[]) {
     let foo: number = 2;
 }
+
+class Foo {
+    constructor(public x = 12, public y = x) {}
+}