Update LKG

Author: mhegazy

lib/enu/diagnosticMessages.generated.json.lcg

@@ -3297,6 +3297,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Only_emit_d_ts_declaration_files_6014" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Only emit '.d.ts' declaration files.]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_clas_9002" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Only identifiers/qualified-names with optional type arguments are currently supported in a class 'extends' clause.]]></Val>

lib/lib.d.ts

@@ -1012,12 +1012,12 @@ interface ReadonlyArray<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
@@ -1107,6 +1107,13 @@ interface ReadonlyArray<T> {
     readonly [n: number]: T;
 }
 
+interface ConcatArray<T> {
+    readonly length: number;
+    readonly [n: number]: T;
+    join(separator?: string): string;
+    slice(start?: number, end?: number): T[];
+}
+
 interface Array<T> {
     /**
       * Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
@@ -1133,12 +1140,12 @@ interface Array<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.

lib/lib.es5.d.ts

@@ -1012,12 +1012,12 @@ interface ReadonlyArray<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
@@ -1107,6 +1107,13 @@ interface ReadonlyArray<T> {
     readonly [n: number]: T;
 }
 
+interface ConcatArray<T> {
+    readonly length: number;
+    readonly [n: number]: T;
+    join(separator?: string): string;
+    slice(start?: number, end?: number): T[];
+}
+
 interface Array<T> {
     /**
       * Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
@@ -1133,12 +1140,12 @@ interface Array<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.

lib/lib.es6.d.ts

@@ -1012,12 +1012,12 @@ interface ReadonlyArray<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
@@ -1107,6 +1107,13 @@ interface ReadonlyArray<T> {
     readonly [n: number]: T;
 }
 
+interface ConcatArray<T> {
+    readonly length: number;
+    readonly [n: number]: T;
+    join(separator?: string): string;
+    slice(start?: number, end?: number): T[];
+}
+
 interface Array<T> {
     /**
       * Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
@@ -1133,12 +1140,12 @@ interface Array<T> {
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: ConcatArray<T>[]): T[];
     /**
       * Combines two or more arrays.
       * @param items Additional items to add to the end of array1.
       */
-    concat(...items: (T | T[] | ReadonlyArray<T>)[]): T[];
+    concat(...items: (T | ConcatArray<T>)[]): T[];
     /**
       * Adds all the elements of an array separated by the specified separator string.
       * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.