Merge master into release branch 06/30 (#9447)

* do not format comma/closeparen in jsxelement

* format jsx expression

* make rules optional

* Remove upper boilerplate from issue template

Our issue stats did not improve appreciably when we added the issue template. Reduce upper boilerplate text and try to make it more action-oriented

* Update issue_template.md

* new options should be optional for compatibility

* Add getCurrentDirectory to ServerHost

* Add nullchecks for typeRoots, remove getCurrentDirectory from ServerHost as it is always the installation location

* VarDate interface and relevant Date.prototype members

* Fix 9363: Object destructuring broken-variables are bound to the wrong object (#9383)

* Fix emit incorrect destructuring mapping in var declaration

* Add tests and baselines

* Add additional tests and baselines

* Fix crash in async functions when targetting ES5.

When targetting ES5 and with --noImplicitReturns,
an async function whose return type could not be determined would cause
a compiler crash.

* Add This type to lib

* getVarDate should be on the Date interface

* Don't emit source files found under node_modules

* Destructuring assignment removes undefined from type when default value is given

* Add nullcheck when calculating indentations for implort clause

* Add test

* Dont load JavaScript if types packages are present

* Renamed API

* Use checkExpression, not checkExpressionCached

* Show "<unknown>" if the name of a declaration is unavailable

* Parse `export default async function` as a declaration

* Removed one error to avoid full path issues

* Fix incorrectly-saved quote symbols in ThirdPartyNoticeText.txt

Author: yuit

ThirdPartyNoticeText.txt

@@ -21,7 +21,7 @@ Third Party Code Components
 --------------------------------------------
 
 ------------------- DefinitelyTyped --------------------
-This file is based on or incorporates material from the projects listed below (collectively ?Third Party Code?). Microsoft is not the original author of the Third Party Code. The original copyright notice and the license, under which Microsoft received such Third Party Code, are set forth below. Such licenses and notices are provided for informational purposes only. Microsoft, not the third party, licenses the Third Party Code to you under the terms set forth in the EULA for the Microsoft Product. Microsoft reserves all other rights not expressly granted under this agreement, whether by implication, estoppel or otherwise. 
+This file is based on or incorporates material from the projects listed below (collectively "Third Party Code"). Microsoft is not the original author of the Third Party Code. The original copyright notice and the license, under which Microsoft received such Third Party Code, are set forth below. Such licenses and notices are provided for informational purposes only. Microsoft, not the third party, licenses the Third Party Code to you under the terms set forth in the EULA for the Microsoft Product. Microsoft reserves all other rights not expressly granted under this agreement, whether by implication, estoppel or otherwise. 
 DefinitelyTyped
 This project is licensed under the MIT license.
 Copyrights are respective of each contributor listed at the beginning of each definition file.

src/compiler/checker.ts

@@ -12544,6 +12544,12 @@ namespace ts {
             if (exprOrAssignment.kind === SyntaxKind.ShorthandPropertyAssignment) {
                 const prop = <ShorthandPropertyAssignment>exprOrAssignment;
                 if (prop.objectAssignmentInitializer) {
+                    // In strict null checking mode, if a default value of a non-undefined type is specified, remove
+                    // undefined from the final type.
+                    if (strictNullChecks &&
+                        !(getCombinedTypeFlags(checkExpression(prop.objectAssignmentInitializer)) & TypeFlags.Undefined)) {
+                        sourceType = getTypeWithFacts(sourceType, TypeFacts.NEUndefined);
+                    }
                     checkBinaryLikeExpression(prop.name, prop.equalsToken, prop.objectAssignmentInitializer, contextualMapper);
                 }
                 target = (<ShorthandPropertyAssignment>exprOrAssignment).name;
@@ -15450,7 +15456,7 @@ namespace ts {
 
         function isUnwrappedReturnTypeVoidOrAny(func: FunctionLikeDeclaration, returnType: Type): boolean {
             const unwrappedReturnType = isAsyncFunctionLike(func) ? getPromisedType(returnType) : returnType;
-            return maybeTypeOfKind(unwrappedReturnType, TypeFlags.Void | TypeFlags.Any);
+            return unwrappedReturnType && maybeTypeOfKind(unwrappedReturnType, TypeFlags.Void | TypeFlags.Any);
         }
 
         function checkReturnStatement(node: ReturnStatement) {

src/compiler/parser.ts

@@ -1155,12 +1155,12 @@ namespace ts {
             if (token === SyntaxKind.ExportKeyword) {
                 nextToken();
                 if (token === SyntaxKind.DefaultKeyword) {
-                    return lookAhead(nextTokenIsClassOrFunction);
+                    return lookAhead(nextTokenIsClassOrFunctionOrAsync);
                 }
                 return token !== SyntaxKind.AsteriskToken && token !== SyntaxKind.AsKeyword && token !== SyntaxKind.OpenBraceToken && canFollowModifier();
             }
             if (token === SyntaxKind.DefaultKeyword) {
-                return nextTokenIsClassOrFunction();
+                return nextTokenIsClassOrFunctionOrAsync();
             }
             if (token === SyntaxKind.StaticKeyword) {
                 nextToken();
@@ -1182,9 +1182,9 @@ namespace ts {
                 || isLiteralPropertyName();
         }
 
-        function nextTokenIsClassOrFunction(): boolean {
+        function nextTokenIsClassOrFunctionOrAsync(): boolean {
             nextToken();
-            return token === SyntaxKind.ClassKeyword || token === SyntaxKind.FunctionKeyword;
+            return token === SyntaxKind.ClassKeyword || token === SyntaxKind.FunctionKeyword || token === SyntaxKind.AsyncKeyword;
         }
 
         // True if positioned at the start of a list element
@@ -5070,7 +5070,7 @@ namespace ts {
          * In such situations, 'permitInvalidConstAsModifier' should be set to true.
          */
         function parseModifiers(permitInvalidConstAsModifier?: boolean): ModifiersArray {
-            let flags = 0;
+            let flags: NodeFlags = 0;
             let modifiers: ModifiersArray;
             while (true) {
                 const modifierStart = scanner.getStartPos();

src/compiler/types.ts

@@ -469,7 +469,7 @@ namespace ts {
     }
 
     export interface ModifiersArray extends NodeArray<Modifier> {
-        flags: number;
+        flags: NodeFlags;
     }
 
     // @kind(SyntaxKind.AbstractKeyword)