Merge pull request #8389 from Microsoft/make-object-literal-this-any-typed

Make `this` in object literal always of type `any`

Author: sandersn

src/compiler/checker.ts

@@ -8228,15 +8228,6 @@ namespace ts {
                 if (signature.thisType) {
                     return signature.thisType;
                 }
-                const parentObject = container.parent && container.parent.kind === SyntaxKind.PropertyAssignment ? container.parent.parent : container.parent;
-                if (parentObject && parentObject.kind === SyntaxKind.ObjectLiteralExpression) {
-                    // Note: this works because object literal methods are deferred,
-                    // which means that the type of the containing object literal is already known.
-                    const type = checkExpressionCached(<ObjectLiteralExpression>parentObject);
-                    if (type) {
-                        return type;
-                    }
-                }
             }
             if (isClassLike(container.parent)) {
                 const symbol = getSymbolOfNode(container.parent);
@@ -8476,10 +8467,7 @@ namespace ts {
             if (isContextSensitiveFunctionOrObjectLiteralMethod(func) && func.kind !== SyntaxKind.ArrowFunction) {
                 const contextualSignature = getContextualSignature(func);
                 if (contextualSignature) {
-                    return contextualSignature.thisType || anyType;
-                }
-                else if (getContextualTypeForFunctionLikeDeclaration(func) === anyType) {
-                    return anyType;
+                    return contextualSignature.thisType;
                 }
             }
 

tests/baselines/reference/commentsOnObjectLiteral2.errors.txt

@@ -1,8 +1,7 @@
 tests/cases/compiler/commentsOnObjectLiteral2.ts(1,14): error TS2304: Cannot find name 'makeClass'.
-tests/cases/compiler/commentsOnObjectLiteral2.ts(9,17): error TS2339: Property 'name' does not exist on type '{ initialize: (name: any) => void; }'.
 
 
-==== tests/cases/compiler/commentsOnObjectLiteral2.ts (2 errors) ====
+==== tests/cases/compiler/commentsOnObjectLiteral2.ts (1 errors) ====
     var Person = makeClass( 
                  ~~~~~~~~~
 !!! error TS2304: Cannot find name 'makeClass'.
@@ -14,8 +13,6 @@ tests/cases/compiler/commentsOnObjectLiteral2.ts(9,17): error TS2339: Property '
             */ 
            initialize: function(name) { 
                this.name = name; 
-                    ~~~~
-!!! error TS2339: Property 'name' does not exist on type '{ initialize: (name: any) => void; }'.
            } /* trailing comment 1*/, 
        } 
     );

tests/baselines/reference/commentsOnObjectLiteral3.symbols

@@ -21,20 +21,13 @@ var v = {
 >a : Symbol(a, Decl(commentsOnObjectLiteral3.ts, 8, 13), Decl(commentsOnObjectLiteral3.ts, 12, 18))
 
   return this.prop;
->this.prop : Symbol(prop, Decl(commentsOnObjectLiteral3.ts, 1, 9))
->this : Symbol(, Decl(commentsOnObjectLiteral3.ts, 1, 7))
->prop : Symbol(prop, Decl(commentsOnObjectLiteral3.ts, 1, 9))
-
  } /*trailing 1*/,
  //setter
  set a(value) {
 >a : Symbol(a, Decl(commentsOnObjectLiteral3.ts, 8, 13), Decl(commentsOnObjectLiteral3.ts, 12, 18))
 >value : Symbol(value, Decl(commentsOnObjectLiteral3.ts, 14, 7))
 
   this.prop = value;
->this.prop : Symbol(prop, Decl(commentsOnObjectLiteral3.ts, 1, 9))
->this : Symbol(, Decl(commentsOnObjectLiteral3.ts, 1, 7))
->prop : Symbol(prop, Decl(commentsOnObjectLiteral3.ts, 1, 9))
 >value : Symbol(value, Decl(commentsOnObjectLiteral3.ts, 14, 7))
 
  } // trailing 2

tests/baselines/reference/commentsOnObjectLiteral3.types

@@ -24,9 +24,9 @@ var v = {
 >a : any
 
   return this.prop;
->this.prop : number
->this : { prop: number; func: () => void; func1(): void; a: any; }
->prop : number
+>this.prop : any
+>this : any
+>prop : any
 
  } /*trailing 1*/,
  //setter
@@ -36,9 +36,9 @@ var v = {
 
   this.prop = value;
 >this.prop = value : any
->this.prop : number
->this : { prop: number; func: () => void; func1(): void; a: any; }
->prop : number
+>this.prop : any
+>this : any
+>prop : any
 >value : any
 
  } // trailing 2

tests/baselines/reference/declFileObjectLiteralWithAccessors.symbols

@@ -15,9 +15,6 @@ function /*1*/makePoint(x: number) {
         set x(a: number) { this.b = a; }
 >x : Symbol(x, Decl(declFileObjectLiteralWithAccessors.ts, 3, 14), Decl(declFileObjectLiteralWithAccessors.ts, 4, 30))
 >a : Symbol(a, Decl(declFileObjectLiteralWithAccessors.ts, 5, 14))
->this.b : Symbol(b, Decl(declFileObjectLiteralWithAccessors.ts, 2, 12))
->this : Symbol(, Decl(declFileObjectLiteralWithAccessors.ts, 2, 10))
->b : Symbol(b, Decl(declFileObjectLiteralWithAccessors.ts, 2, 12))
 >a : Symbol(a, Decl(declFileObjectLiteralWithAccessors.ts, 5, 14))
 
     };

tests/baselines/reference/declFileObjectLiteralWithAccessors.types

@@ -19,9 +19,9 @@ function /*1*/makePoint(x: number) {
 >x : number
 >a : number
 >this.b = a : number
->this.b : number
->this : { b: number; x: number; }
->b : number
+>this.b : any
+>this : any
+>b : any
 >a : number
 
     };

tests/baselines/reference/declFileObjectLiteralWithOnlySetter.symbols

@@ -11,9 +11,6 @@ function /*1*/makePoint(x: number) {
         set x(a: number) { this.b = a; }
 >x : Symbol(x, Decl(declFileObjectLiteralWithOnlySetter.ts, 3, 14))
 >a : Symbol(a, Decl(declFileObjectLiteralWithOnlySetter.ts, 4, 14))
->this.b : Symbol(b, Decl(declFileObjectLiteralWithOnlySetter.ts, 2, 12))
->this : Symbol(, Decl(declFileObjectLiteralWithOnlySetter.ts, 2, 10))
->b : Symbol(b, Decl(declFileObjectLiteralWithOnlySetter.ts, 2, 12))
 >a : Symbol(a, Decl(declFileObjectLiteralWithOnlySetter.ts, 4, 14))
 
     };

tests/baselines/reference/declFileObjectLiteralWithOnlySetter.types

@@ -15,9 +15,9 @@ function /*1*/makePoint(x: number) {
 >x : number
 >a : number
 >this.b = a : number
->this.b : number
->this : { b: number; x: number; }
->b : number
+>this.b : any
+>this : any
+>b : any
 >a : number
 
     };

tests/baselines/reference/declarationEmitThisPredicates02.errors.txt

@@ -1,9 +1,7 @@
 tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicates02.ts(9,10): error TS2526: A 'this' type is available only in a non-static member of a class or interface.
-tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicates02.ts(10,19): error TS2352: Type '{ m(): this is Foo; }' cannot be converted to type 'Foo'.
-  Property 'a' is missing in type '{ m(): this is Foo; }'.
 
 
-==== tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicates02.ts (2 errors) ====
+==== tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicates02.ts (1 errors) ====
 
     export interface Foo {
         a: string;
@@ -16,9 +14,6 @@ tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredic
              ~~~~
 !!! error TS2526: A 'this' type is available only in a non-static member of a class or interface.
             let dis = this as Foo;
-                      ~~~~~~~~~~~
-!!! error TS2352: Type '{ m(): this is Foo; }' cannot be converted to type 'Foo'.
-!!! error TS2352:   Property 'a' is missing in type '{ m(): this is Foo; }'.
             return dis.a != null && dis.b != null && dis.c != null;
         }
     }

tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName02.errors.txt

@@ -1,10 +1,8 @@
 tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicatesWithPrivateName02.ts(8,14): error TS4025: Exported variable 'obj' has or is using private name 'Foo'.
 tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicatesWithPrivateName02.ts(9,10): error TS2526: A 'this' type is available only in a non-static member of a class or interface.
-tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicatesWithPrivateName02.ts(10,19): error TS2352: Type '{ m(): this is Foo; }' cannot be converted to type 'Foo'.
-  Property 'a' is missing in type '{ m(): this is Foo; }'.
 
 
-==== tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicatesWithPrivateName02.ts (3 errors) ====
+==== tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredicatesWithPrivateName02.ts (2 errors) ====
 
     interface Foo {
         a: string;
@@ -19,9 +17,6 @@ tests/cases/conformance/declarationEmit/typePredicates/declarationEmitThisPredic
              ~~~~
 !!! error TS2526: A 'this' type is available only in a non-static member of a class or interface.
             let dis = this as Foo;
-                      ~~~~~~~~~~~
-!!! error TS2352: Type '{ m(): this is Foo; }' cannot be converted to type 'Foo'.
-!!! error TS2352:   Property 'a' is missing in type '{ m(): this is Foo; }'.
             return dis.a != null && dis.b != null && dis.c != null;
         }
     }

tests/baselines/reference/emitCompoundExponentiationAssignmentWithIndexingOnLHS3.symbols

@@ -8,18 +8,11 @@ var object = {
 
     get 0() {
         return this._0;
->this._0 : Symbol(_0, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 14))
->this : Symbol(, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 12))
->_0 : Symbol(_0, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 14))
-
     },
     set 0(x: number) {
 >x : Symbol(x, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 6, 10))
 
         this._0 = x;
->this._0 : Symbol(_0, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 14))
->this : Symbol(, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 12))
->_0 : Symbol(_0, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 1, 14))
 >x : Symbol(x, Decl(emitCompoundExponentiationAssignmentWithIndexingOnLHS3.ts, 6, 10))
 
     },

tests/baselines/reference/emitCompoundExponentiationAssignmentWithIndexingOnLHS3.types

@@ -10,19 +10,19 @@ var object = {
 
     get 0() {
         return this._0;
->this._0 : number
->this : { 0: number; _0: number; }
->_0 : number
+>this._0 : any
+>this : any
+>_0 : any
 
     },
     set 0(x: number) {
 >x : number
 
         this._0 = x;
 >this._0 = x : number
->this._0 : number
->this : { 0: number; _0: number; }
->_0 : number
+>this._0 : any
+>this : any
+>_0 : any
 >x : number
 
     },

tests/baselines/reference/fatarrowfunctions.symbols

@@ -163,11 +163,6 @@ var messenger = {
 
         setTimeout(() => { this.message.toString(); }, 3000);
 >setTimeout : Symbol(setTimeout, Decl(fatarrowfunctions.ts, 34, 1))
->this.message.toString : Symbol(String.toString, Decl(lib.d.ts, --, --))
->this.message : Symbol(message, Decl(fatarrowfunctions.ts, 38, 17))
->this : Symbol(, Decl(fatarrowfunctions.ts, 38, 15))
->message : Symbol(message, Decl(fatarrowfunctions.ts, 38, 17))
->toString : Symbol(String.toString, Decl(lib.d.ts, --, --))
     }
 };
 

tests/baselines/reference/fatarrowfunctions.types

@@ -234,12 +234,12 @@ var messenger = {
 >setTimeout(() => { this.message.toString(); }, 3000) : number
 >setTimeout : (expression: any, msec?: number, language?: any) => number
 >() => { this.message.toString(); } : () => void
->this.message.toString() : string
->this.message.toString : () => string
->this.message : string
->this : { message: string; start: () => void; }
->message : string
->toString : () => string
+>this.message.toString() : any
+>this.message.toString : any
+>this.message : any
+>this : any
+>message : any
+>toString : any
 >3000 : number
     }
 };

tests/baselines/reference/fatarrowfunctionsInFunctions.symbols

@@ -16,17 +16,12 @@ var messenger = {
 
         var _self = this;
 >_self : Symbol(_self, Decl(fatarrowfunctionsInFunctions.ts, 5, 11))
->this : Symbol(, Decl(fatarrowfunctionsInFunctions.ts, 2, 15))
 
         setTimeout(function() {
 >setTimeout : Symbol(setTimeout, Decl(fatarrowfunctionsInFunctions.ts, 0, 0))
 
             _self.message.toString(); 
->_self.message.toString : Symbol(String.toString, Decl(lib.d.ts, --, --))
->_self.message : Symbol(message, Decl(fatarrowfunctionsInFunctions.ts, 2, 17))
 >_self : Symbol(_self, Decl(fatarrowfunctionsInFunctions.ts, 5, 11))
->message : Symbol(message, Decl(fatarrowfunctionsInFunctions.ts, 2, 17))
->toString : Symbol(String.toString, Decl(lib.d.ts, --, --))
 
         }, 3000); 
     }

tests/baselines/reference/fatarrowfunctionsInFunctions.types

@@ -18,21 +18,21 @@ var messenger = {
 >function() {        var _self = this;        setTimeout(function() {            _self.message.toString();         }, 3000);     } : () => void
 
         var _self = this;
->_self : { message: string; start: () => void; }
->this : { message: string; start: () => void; }
+>_self : any
+>this : any
 
         setTimeout(function() {
 >setTimeout(function() {            _self.message.toString();         }, 3000) : number
 >setTimeout : (expression: any, msec?: number, language?: any) => number
 >function() {            _self.message.toString();         } : () => void
 
             _self.message.toString(); 
->_self.message.toString() : string
->_self.message.toString : () => string
->_self.message : string
->_self : { message: string; start: () => void; }
->message : string
->toString : () => string
+>_self.message.toString() : any
+>_self.message.toString : any
+>_self.message : any
+>_self : any
+>message : any
+>toString : any
 
         }, 3000); 
 >3000 : number

tests/baselines/reference/looseThisTypeInFunctions.errors.txt

@@ -1,13 +1,12 @@
 tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(21,1): error TS2322: Type '(this: C, m: number) => number' is not assignable to type '(this: void, m: number) => number'.
   The 'this' types of each signature are incompatible.
     Type 'void' is not assignable to type 'C'.
-tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(25,27): error TS2339: Property 'length' does not exist on type 'number'.
 tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(33,28): error TS2339: Property 'length' does not exist on type 'number'.
 tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(37,9): error TS2684: The 'this' context of type 'void' is not assignable to method's 'this' of type 'I'.
 tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(46,20): error TS2339: Property 'length' does not exist on type 'number'.
 
 
-==== tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts (5 errors) ====
+==== tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts (4 errors) ====
     interface I {
         n: number;
         explicitThis(this: this, m: number): number;
@@ -37,8 +36,6 @@ tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(46,20): error
         n: 101,
         explicitThis: function (m: number) {
             return m + this.n.length; // error, 'length' does not exist on 'number'
-                              ~~~~~~
-!!! error TS2339: Property 'length' does not exist on type 'number'.
         },
         implicitThis(m: number): number { return m; }
     };

tests/baselines/reference/noImplicitThisObjectLiterals.errors.txt

@@ -0,0 +1,22 @@
+tests/cases/compiler/noImplicitThisObjectLiterals.ts(2,8): error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+tests/cases/compiler/noImplicitThisObjectLiterals.ts(4,16): error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+tests/cases/compiler/noImplicitThisObjectLiterals.ts(7,16): error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+
+
+==== tests/cases/compiler/noImplicitThisObjectLiterals.ts (3 errors) ====
+    let o = {
+        d: this, // error, this: any
+           ~~~~
+!!! error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+        m() {
+            return this.d.length; // error, this: any
+                   ~~~~
+!!! error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+        },
+        f: function() {
+            return this.d.length; // error, this: any
+                   ~~~~
+!!! error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
+        }
+    }
+    

tests/baselines/reference/noImplicitThisObjectLiterals.js

@@ -0,0 +1,22 @@
+//// [noImplicitThisObjectLiterals.ts]
+let o = {
+    d: this, // error, this: any
+    m() {
+        return this.d.length; // error, this: any
+    },
+    f: function() {
+        return this.d.length; // error, this: any
+    }
+}
+
+
+//// [noImplicitThisObjectLiterals.js]
+var o = {
+    d: this,
+    m: function () {
+        return this.d.length; // error, this: any
+    },
+    f: function () {
+        return this.d.length; // error, this: any
+    }
+};

tests/baselines/reference/selfInLambdas.symbols

@@ -37,15 +37,8 @@ var o = {
 >onmousemove : Symbol(Window.onmousemove, Decl(selfInLambdas.ts, 6, 18))
 
             this.counter++
->this.counter : Symbol(counter, Decl(selfInLambdas.ts, 10, 9))
->this : Symbol(, Decl(selfInLambdas.ts, 10, 7))
->counter : Symbol(counter, Decl(selfInLambdas.ts, 10, 9))
-
             var f = () => this.counter;
 >f : Symbol(f, Decl(selfInLambdas.ts, 18, 15))
->this.counter : Symbol(counter, Decl(selfInLambdas.ts, 10, 9))
->this : Symbol(, Decl(selfInLambdas.ts, 10, 7))
->counter : Symbol(counter, Decl(selfInLambdas.ts, 10, 9))
 
         }