fix #13556: enable rest/spread on object

Author: HerringtonDarkholme

src/compiler/checker.ts

@@ -1,4 +1,4 @@
-/// <reference path="moduleNameResolver.ts"/>
+/// <reference path="moduleNameResolver.ts"/>
 /// <reference path="binder.ts"/>
 
 /* @internal */
@@ -11784,7 +11784,7 @@ namespace ts {
        }
 
         function isValidSpreadType(type: Type): boolean {
-            return !!(type.flags & (TypeFlags.Any | TypeFlags.Null | TypeFlags.Undefined) ||
+            return !!(type.flags & (TypeFlags.Any | TypeFlags.Null | TypeFlags.Undefined | TypeFlags.NonPrimitive) ||
                 type.flags & TypeFlags.Object && !isGenericMappedType(type) ||
                 type.flags & TypeFlags.UnionOrIntersection && !forEach((<UnionOrIntersectionType>type).types, t => !isValidSpreadType(t)));
         }

tests/baselines/reference/nonPrimitiveAccessProperty.errors.txt

@@ -1,10 +1,16 @@
 tests/cases/conformance/types/nonPrimitive/nonPrimitiveAccessProperty.ts(3,3): error TS2339: Property 'nonExist' does not exist on type 'object'.
+tests/cases/conformance/types/nonPrimitive/nonPrimitiveAccessProperty.ts(5,7): error TS2459: Type 'object' has no property 'destructuring' and no string index signature.
 
 
-==== tests/cases/conformance/types/nonPrimitive/nonPrimitiveAccessProperty.ts (1 errors) ====
+==== tests/cases/conformance/types/nonPrimitive/nonPrimitiveAccessProperty.ts (2 errors) ====
     var a: object;
     a.toString();
     a.nonExist(); // error
       ~~~~~~~~
 !!! error TS2339: Property 'nonExist' does not exist on type 'object'.
+    
+    var { destructuring } = a; // error
+          ~~~~~~~~~~~~~
+!!! error TS2459: Type 'object' has no property 'destructuring' and no string index signature.
+    var { ...rest } = a; // ok
 

tests/baselines/reference/nonPrimitiveAccessProperty.js

@@ -2,9 +2,23 @@
 var a: object;
 a.toString();
 a.nonExist(); // error
+
+var { destructuring } = a; // error
+var { ...rest } = a; // ok
 
 
 //// [nonPrimitiveAccessProperty.js]
+var __rest = (this && this.__rest) || function (s, e) {
+    var t = {};
+    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
+        t[p] = s[p];
+    if (s != null && typeof Object.getOwnPropertySymbols === "function")
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
+            t[p[i]] = s[p[i]];
+    return t;
+};
 var a;
 a.toString();
 a.nonExist(); // error
+var destructuring = a.destructuring; // error
+var rest = __rest(a, []); // ok

tests/baselines/reference/objectSpread.js

@@ -78,6 +78,8 @@ let computedAfter: { a: number, b: string, "at the end": number } =
 // shortcut syntax
 let a = 12;
 let shortCutted: { a: number, b: string } = { ...o, a }
+// non primitive
+let spreadNonPrimitve = { ...<object>{}}
 
 
 
@@ -148,4 +150,6 @@ var computedAfter = __assign({}, o, (_c = { b: 'yeah' }, _c['at the end'] = 14,
 // shortcut syntax
 var a = 12;
 var shortCutted = __assign({}, o, { a: a });
+// non primitive
+var spreadNonPrimitve = __assign({}, {});
 var _a, _b, _c;

tests/baselines/reference/objectSpread.symbols

@@ -316,4 +316,8 @@ let shortCutted: { a: number, b: string } = { ...o, a }
 >o : Symbol(o, Decl(objectSpread.ts, 0, 3))
 >a : Symbol(a, Decl(objectSpread.ts, 78, 51))
 
+// non primitive
+let spreadNonPrimitve = { ...<object>{}}
+>spreadNonPrimitve : Symbol(spreadNonPrimitve, Decl(objectSpread.ts, 80, 3))
+
 

tests/baselines/reference/objectSpread.types

@@ -407,4 +407,11 @@ let shortCutted: { a: number, b: string } = { ...o, a }
 >o : { a: number; b: string; }
 >a : number
 
+// non primitive
+let spreadNonPrimitve = { ...<object>{}}
+>spreadNonPrimitve : { constructor: Function; toString(): string; toLocaleString(): string; valueOf(): Object; hasOwnProperty(v: string): boolean; isPrototypeOf(v: Object): boolean; propertyIsEnumerable(v: string): boolean; }
+>{ ...<object>{}} : { constructor: Function; toString(): string; toLocaleString(): string; valueOf(): Object; hasOwnProperty(v: string): boolean; isPrototypeOf(v: Object): boolean; propertyIsEnumerable(v: string): boolean; }
+><object>{} : object
+>{} : {}
+
 

tests/baselines/reference/objectSpreadNegative.errors.txt

@@ -14,11 +14,12 @@ tests/cases/conformance/types/spread/objectSpreadNegative.ts(37,19): error TS269
 tests/cases/conformance/types/spread/objectSpreadNegative.ts(42,1): error TS2349: Cannot invoke an expression whose type lacks a call signature. Type '{}' has no compatible call signatures.
 tests/cases/conformance/types/spread/objectSpreadNegative.ts(46,12): error TS2339: Property 'b' does not exist on type '{}'.
 tests/cases/conformance/types/spread/objectSpreadNegative.ts(52,9): error TS2339: Property 'm' does not exist on type '{ p: number; }'.
-tests/cases/conformance/types/spread/objectSpreadNegative.ts(56,14): error TS2698: Spread types may only be created from object types.
-tests/cases/conformance/types/spread/objectSpreadNegative.ts(59,14): error TS2698: Spread types may only be created from object types.
+tests/cases/conformance/types/spread/objectSpreadNegative.ts(57,11): error TS2339: Property 'a' does not exist on type '{ constructor: Function; toString(): string; toLocaleString(): string; valueOf(): Object; hasOwnProperty(v: string): boolean; isPrototypeOf(v: Object): boolean; propertyIsEnumerable(v: string): boolean; }'.
+tests/cases/conformance/types/spread/objectSpreadNegative.ts(61,14): error TS2698: Spread types may only be created from object types.
+tests/cases/conformance/types/spread/objectSpreadNegative.ts(64,14): error TS2698: Spread types may only be created from object types.
 
 
-==== tests/cases/conformance/types/spread/objectSpreadNegative.ts (15 errors) ====
+==== tests/cases/conformance/types/spread/objectSpreadNegative.ts (16 errors) ====
     let o = { a: 1, b: 'no' }
 
     /// private propagates
@@ -101,6 +102,13 @@ tests/cases/conformance/types/spread/objectSpreadNegative.ts(59,14): error TS269
             ~
 !!! error TS2339: Property 'm' does not exist on type '{ p: number; }'.
 
+    // non primitive
+    let obj: object = { a: 123 };
+    let spreadObj = { ...obj };
+    spreadObj.a; // error 'a' is not in {}
+              ~
+!!! error TS2339: Property 'a' does not exist on type '{ constructor: Function; toString(): string; toLocaleString(): string; valueOf(): Object; hasOwnProperty(v: string): boolean; isPrototypeOf(v: Object): boolean; propertyIsEnumerable(v: string): boolean; }'.
+    
     // generics
     function f<T, U>(t: T, u: U) {
         return { ...t, ...u, id: 'id' };

tests/baselines/reference/objectSpreadNegative.js

@@ -52,6 +52,11 @@ let c: C = new C()
 let spreadC = { ...c }
 spreadC.m(); // error 'm' is not in '{ ... c }'
 
+// non primitive
+let obj: object = { a: 123 };
+let spreadObj = { ...obj };
+spreadObj.a; // error 'a' is not in {}
+
 // generics
 function f<T, U>(t: T, u: U) {
     return { ...t, ...u, id: 'id' };
@@ -132,6 +137,10 @@ var C = (function () {
 var c = new C();
 var spreadC = __assign({}, c);
 spreadC.m(); // error 'm' is not in '{ ... c }'
+// non primitive
+var obj = { a: 123 };
+var spreadObj = __assign({}, obj);
+spreadObj.a; // error 'a' is not in {}
 // generics
 function f(t, u) {
     return __assign({}, t, u, { id: 'id' });

tests/cases/conformance/types/nonPrimitive/nonPrimitiveAccessProperty.ts

@@ -1,3 +1,6 @@
 var a: object;
 a.toString();
 a.nonExist(); // error
+
+var { destructuring } = a; // error
+var { ...rest } = a; // ok

tests/cases/conformance/types/spread/objectSpread.ts

@@ -78,4 +78,6 @@ let computedAfter: { a: number, b: string, "at the end": number } =
 // shortcut syntax
 let a = 12;
 let shortCutted: { a: number, b: string } = { ...o, a }
+// non primitive
+let spreadNonPrimitve = { ...<object>{}}
 

tests/cases/conformance/types/spread/objectSpreadNegative.ts

@@ -52,6 +52,11 @@ let c: C = new C()
 let spreadC = { ...c }
 spreadC.m(); // error 'm' is not in '{ ... c }'
 
+// non primitive
+let obj: object = { a: 123 };
+let spreadObj = { ...obj };
+spreadObj.a; // error 'a' is not in {}
+
 // generics
 function f<T, U>(t: T, u: U) {
     return { ...t, ...u, id: 'id' };