Contextually type parameters in super calls using type arguments on the base class.

src/compiler/checker.ts

@@ -5978,11 +5978,36 @@ module ts {
             return args;
         }
 
+        // In a 'super' call, type arguments are not provided within the CallExpression node itself.
+        // Instead, they must be fetched from the class declaration's base type node.
+        function getEffectiveTypeArguments(callExpression: CallExpression): TypeNode[] {
+            if (callExpression.expression.kind === SyntaxKind.SuperKeyword) {
+                // TODO (drosen): 1) Discuss if checking needs to be done at this point.
+                //                2) Have a test where type arguments are not provided on the base class.
+                //                3) Have a test where the base class is not generic.
+                var containingClass = <ClassDeclaration>getAncestor(callExpression, SyntaxKind.ClassDeclaration);
+                var baseClassTypeNode = getClassBaseTypeNode(containingClass);
+                return baseClassTypeNode.typeArguments;
+            }
+            else {
+                // Ordinary case - simple function invocation.
+                return (<CallExpression>callExpression).typeArguments;
+            }
+        }
+
         function resolveCall(node: CallLikeExpression, signatures: Signature[], candidatesOutArray: Signature[]): Signature {
             var isTaggedTemplate = node.kind === SyntaxKind.TaggedTemplateExpression;
 
-            var typeArguments = isTaggedTemplate ? undefined : (<CallExpression>node).typeArguments;
-            forEach(typeArguments, checkSourceElement);
+            var typeArguments: TypeNode[];
+
+            if (!isTaggedTemplate) {
+                typeArguments = getEffectiveTypeArguments(<CallExpression>node);
+
+                // We already perform checking on the type arguments on the class declaration itself.
+                if ((<CallExpression>node).expression.kind !== SyntaxKind.SuperKeyword) {
+                    forEach(typeArguments, checkSourceElement);
+                }
+            }
 
             var candidates = candidatesOutArray || [];
             // collectCandidates fills up the candidates array directly
@@ -6248,7 +6273,7 @@ module ts {
                 // Another error has already been reported
                 return resolveErrorCall(node);
             }
-            
+
             // Technically, this signatures list may be incomplete. We are taking the apparent type,
             // but we are not including call signatures that may have been added to the Object or
             // Function interface, since they have none by default. This is a bit of a leap of faith

tests/baselines/reference/superCallArgsMustMatch.errors.txt

@@ -0,0 +1,31 @@
+tests/cases/compiler/superCallArgsMustMatch.ts(17,15): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
+
+
+==== tests/cases/compiler/superCallArgsMustMatch.ts (1 errors) ====
+    class T5<T>{
+
+        public foo: T;
+
+        constructor(public bar: T) { }
+
+    }
+
+
+
+    class T6 extends T5<number>{
+
+        constructor() {
+
+            // Should error; base constructor has type T for first arg,
+            // which is instantiated with 'number' in the extends clause
+            super("hi");
+                  ~~~~
+!!! error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
+
+            var x: number = this.foo;
+
+        }
+
+    }
+
+

tests/baselines/reference/superCallArgsMustMatch.js

@@ -13,7 +13,9 @@ class T6 extends T5<number>{
 
     constructor() {
 
-        super("hi"); // Should error, base constructor has type T for first arg, which is fixed as number in the extends clause
+        // Should error; base constructor has type T for first arg,
+        // which is instantiated with 'number' in the extends clause
+        super("hi");
 
         var x: number = this.foo;
 
@@ -39,7 +41,9 @@ var T5 = (function () {
 var T6 = (function (_super) {
     __extends(T6, _super);
     function T6() {
-        _super.call(this, "hi"); // Should error, base constructor has type T for first arg, which is fixed as number in the extends clause
+        // Should error; base constructor has type T for first arg,
+        // which is instantiated with 'number' in the extends clause
+        _super.call(this, "hi");
         var x = this.foo;
     }
     return T6;

tests/baselines/reference/superCallParameterContextualTyping1.js

@@ -0,0 +1,35 @@
+//// [superCallParameterContextualTyping1.ts]
+
+class A<T1, T2> {
+    constructor(private map: (value: T1) => T2) {
+
+    }
+}
+
+class B extends A<number, string> {
+    // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
+    constructor() { super(value => String(value.toExponential())); }
+}
+
+
+//// [superCallParameterContextualTyping1.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var A = (function () {
+    function A(map) {
+        this.map = map;
+    }
+    return A;
+})();
+var B = (function (_super) {
+    __extends(B, _super);
+    // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
+    function B() {
+        _super.call(this, function (value) { return String(value.toExponential()); });
+    }
+    return B;
+})(A);

tests/baselines/reference/superCallParameterContextualTyping1.types

@@ -0,0 +1,34 @@
+=== tests/cases/conformance/expressions/contextualTyping/superCallParameterContextualTyping1.ts ===
+
+class A<T1, T2> {
+>A : A<T1, T2>
+>T1 : T1
+>T2 : T2
+
+    constructor(private map: (value: T1) => T2) {
+>map : (value: T1) => T2
+>value : T1
+>T1 : T1
+>T2 : T2
+
+    }
+}
+
+class B extends A<number, string> {
+>B : B
+>A : A<T1, T2>
+
+    // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
+    constructor() { super(value => String(value.toExponential())); }
+>super(value => String(value.toExponential())) : void
+>super : typeof A
+>value => String(value.toExponential()) : (value: number) => string
+>value : number
+>String(value.toExponential()) : string
+>String : StringConstructor
+>value.toExponential() : string
+>value.toExponential : (fractionDigits?: number) => string
+>value : number
+>toExponential : (fractionDigits?: number) => string
+}
+

tests/baselines/reference/superCallParameterContextualTyping2.errors.txt

@@ -0,0 +1,17 @@
+tests/cases/conformance/expressions/contextualTyping/superCallParameterContextualTyping2.ts(10,43): error TS2349: Cannot invoke an expression whose type lacks a call signature.
+
+
+==== tests/cases/conformance/expressions/contextualTyping/superCallParameterContextualTyping2.ts (1 errors) ====
+
+    class A<T1, T2> {
+        constructor(private map: (value: T1) => T2) {
+
+        }
+    }
+
+    class C extends A<number, string> {
+        // Ensure 'value' is not of type 'any' by invoking it with type arguments.
+        constructor() { super(value => String(value<string>())); }
+                                              ~~~~~~~~~~~~~~~
+!!! error TS2349: Cannot invoke an expression whose type lacks a call signature.
+    }

tests/baselines/reference/superCallParameterContextualTyping2.js

@@ -0,0 +1,34 @@
+//// [superCallParameterContextualTyping2.ts]
+
+class A<T1, T2> {
+    constructor(private map: (value: T1) => T2) {
+
+    }
+}
+
+class C extends A<number, string> {
+    // Ensure 'value' is not of type 'any' by invoking it with type arguments.
+    constructor() { super(value => String(value<string>())); }
+}
+
+//// [superCallParameterContextualTyping2.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var A = (function () {
+    function A(map) {
+        this.map = map;
+    }
+    return A;
+})();
+var C = (function (_super) {
+    __extends(C, _super);
+    // Ensure 'value' is not of type 'any' by invoking it with type arguments.
+    function C() {
+        _super.call(this, function (value) { return String(value()); });
+    }
+    return C;
+})(A);

tests/cases/compiler/superCallArgsMustMatch.ts

@@ -12,7 +12,9 @@ class T6 extends T5<number>{
 
     constructor() {
 
-        super("hi"); // Should error, base constructor has type T for first arg, which is fixed as number in the extends clause
+        // Should error; base constructor has type T for first arg,
+        // which is instantiated with 'number' in the extends clause
+        super("hi");
 
         var x: number = this.foo;
 

tests/cases/conformance/expressions/contextualTyping/superCallParameterContextualTyping1.ts

@@ -0,0 +1,11 @@
+
+class A<T1, T2> {
+    constructor(private map: (value: T1) => T2) {
+
+    }
+}
+
+class B extends A<number, string> {
+    // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
+    constructor() { super(value => String(value.toExponential())); }
+}

tests/cases/conformance/expressions/contextualTyping/superCallParameterContextualTyping2.ts

@@ -0,0 +1,11 @@
+
+class A<T1, T2> {
+    constructor(private map: (value: T1) => T2) {
+
+    }
+}
+
+class C extends A<number, string> {
+    // Ensure 'value' is not of type 'any' by invoking it with type arguments.
+    constructor() { super(value => String(value<string>())); }
+}

tests/cases/fourslash/quickInfoForContextuallyTypedArrowFunctionInSuperCall.ts

@@ -0,0 +1,20 @@
+/// <reference path='fourslash.ts'/>
+
+////class A<T1, T2> {
+////    constructor(private map: (value: T1) => T2) {
+////
+////    }
+////}
+////
+////class B extends A<number, string> {
+////    constructor() { super(va/*1*/lue => String(va/*2*/lue.toExpone/*3*/ntial())); }
+////}
+
+goTo.marker('1');
+verify.quickInfoIs('(parameter) value: number');
+
+goTo.marker('2');
+verify.quickInfoIs('(parameter) value: number');
+
+goTo.marker('3');
+verify.quickInfoIs('(method) Number.toExponential(fractionDigits?: number): string');