Revert explicitly typed special assignments

src/compiler/checker.ts

@@ -4714,10 +4714,6 @@ namespace ts {
             // function/class/{} assignments are fresh declarations, not property assignments, so only add prototype assignments
             const specialDeclaration = getAssignedJavascriptInitializer(symbol.valueDeclaration);
             if (specialDeclaration) {
-                const tag = getJSDocTypeTag(specialDeclaration);
-                if (tag && tag.typeExpression) {
-                    return getTypeFromTypeNode(tag.typeExpression);
-                }
                 return getWidenedLiteralType(checkExpressionCached(specialDeclaration));
             }
             const types: Type[] = [];
@@ -5085,7 +5081,7 @@ namespace ts {
         }
 
         function getJSInitializerType(decl: Node, symbol: Symbol, init: Expression | undefined): Type | undefined {
-            if (init && isInJavaScriptFile(init) && isObjectLiteralExpression(init) && init.properties.length === 0) {
+            if (init && isInJavaScriptFile(init) && isObjectLiteralExpression(init)) {
                 const exports = createSymbolTable();
                 while (isBinaryExpression(decl) || isPropertyAccessExpression(decl)) {
                     const s = getSymbolOfNode(decl);
@@ -15790,22 +15786,22 @@ namespace ts {
         }
 
         // In an assignment expression, the right operand is contextually typed by the type of the left operand.
-        // Don't do this for special property assignments unless there is a type tag on the assignment, to avoid circularity from checking the right operand.
+        // Don't do this for special property assignments to avoid circularity.
         function isContextSensitiveAssignment(binaryExpression: BinaryExpression): boolean {
             const kind = getSpecialPropertyAssignmentKind(binaryExpression);
             switch (kind) {
                 case SpecialPropertyAssignmentKind.None:
                     return true;
                 case SpecialPropertyAssignmentKind.Property:
-                case SpecialPropertyAssignmentKind.ExportsProperty:
-                case SpecialPropertyAssignmentKind.Prototype:
-                case SpecialPropertyAssignmentKind.PrototypeProperty:
                     // If `binaryExpression.left` was assigned a symbol, then this is a new declaration; otherwise it is an assignment to an existing declaration.
                     // See `bindStaticPropertyAssignment` in `binder.ts`.
-                    return !binaryExpression.left.symbol || binaryExpression.left.symbol.valueDeclaration && !!getJSDocTypeTag(binaryExpression.left.symbol.valueDeclaration);
-                case SpecialPropertyAssignmentKind.ThisProperty:
+                    return !binaryExpression.left.symbol;
+                case SpecialPropertyAssignmentKind.ExportsProperty:
                 case SpecialPropertyAssignmentKind.ModuleExports:
-                    return !binaryExpression.symbol || binaryExpression.symbol.valueDeclaration && !!getJSDocTypeTag(binaryExpression.symbol.valueDeclaration);
+                case SpecialPropertyAssignmentKind.PrototypeProperty:
+                case SpecialPropertyAssignmentKind.ThisProperty:
+                case SpecialPropertyAssignmentKind.Prototype:
+                    return false;
                 default:
                     return Debug.assertNever(kind);
             }

tests/baselines/reference/chainedPrototypeAssignment.types

@@ -86,9 +86,9 @@ A.prototype = B.prototype = {
 >A : typeof A
 >prototype : { [x: string]: any; m(n: number): number; }
 >B.prototype = {    /** @param {number} n */    m(n) {        return n + 1    }} : { [x: string]: any; m(n: number): number; }
->B.prototype : { [x: string]: any; m(n: number): number; }
+>B.prototype : { [x: string]: any; }
 >B : typeof B
->prototype : { [x: string]: any; m(n: number): number; }
+>prototype : { [x: string]: any; }
 >{    /** @param {number} n */    m(n) {        return n + 1    }} : { [x: string]: any; m(n: number): number; }
 
     /** @param {number} n */

tests/baselines/reference/conflictingCommonJSES2015Exports.types

@@ -7,11 +7,11 @@ export function abc(a, b, c) { return 5; }
 >5 : 5
 
 module.exports = { abc };
->module.exports = { abc } : { abc: (a: any, b: any, c: any) => number; }
+>module.exports = { abc } : { [x: string]: any; abc: (a: any, b: any, c: any) => number; }
 >module.exports : any
 >module : any
 >exports : any
->{ abc } : { abc: (a: any, b: any, c: any) => number; }
+>{ abc } : { [x: string]: any; abc: (a: any, b: any, c: any) => number; }
 >abc : (a: any, b: any, c: any) => number
 
 === tests/cases/conformance/salsa/use.js ===