fix hash.ts typings

src/vs/base/common/hash.ts

@@ -69,6 +69,13 @@ function objectHash(obj: any, initialHashVal: number): number {
 	}, initialHashVal);
 }
 
+// this is shared global between browsers and nodejs
+declare const crypto: {
+	subtle: {
+		digest(a: string, b: ArrayBufferView): Promise<ArrayBuffer>;
+	};
+};
+
 /** Hashes the input as SHA-1, returning a hex-encoded string. */
 export const hashAsync = (input: string | ArrayBufferView | VSBuffer) => {
 	// Note: I would very much like to expose a streaming interface for hashing