Merge pull request #8771 from YuichiNukiyama/fix8505

add SharedArrayBuffer

src/lib/es2017.d.ts

@@ -1,2 +1,3 @@
 /// <reference path="lib.es2016.d.ts" />
-/// <reference path="lib.es2017.object.d.ts" />
+/// <reference path="lib.es2017.object.d.ts" />
+/// <reference path="lib.es2017.sharedmemory.d.ts" />

src/lib/es2017.sharedmemory.d.ts

@@ -0,0 +1,27 @@
+/// <reference path="lib.es2015.symbol.d.ts" />
+/// <reference path="lib.es2015.symbol.wellknown.d.ts" />
+
+interface SharedArrayBuffer {
+    /**
+      * Read-only. The length of the ArrayBuffer (in bytes).
+      */
+    readonly byteLength: number;
+
+    /*
+     * The SharedArrayBuffer constructor's length property whose value is 1.
+     */
+    length: number;
+    /**
+      * Returns a section of an SharedArrayBuffer.
+      */ 
+    slice(begin:number, end?:number): SharedArrayBuffer;
+    readonly [Symbol.species]: SharedArrayBuffer;
+    readonly [Symbol.toStringTag]: "SharedArrayBuffer";
+}
+
+interface SharedArrayBufferConstructor {
+    readonly prototype: SharedArrayBuffer;
+    new (byteLength: number): SharedArrayBuffer;
+}
+
+declare var SharedArrayBuffer: SharedArrayBufferConstructor;