node: Add methods Buffer.compare(), NodeBuffer.equals() and NodeBuffer.compare().

node/node.d.ts

@@ -127,6 +127,10 @@ declare var Buffer: {
      *   If totalLength is not provided, it is read from the buffers in the list. However, this adds an additional loop to the function, so it is faster to provide the length explicitly.
      */
     concat(list: Buffer[], totalLength?: number): Buffer;
+    /**
+     * The same as buf1.compare(buf2).
+     */
+    compare(buf1: Buffer, buf2: Buffer): number;
 };
 
 /************************************************
@@ -327,6 +331,8 @@ interface NodeBuffer {
     toString(encoding?: string, start?: number, end?: number): string;
     toJSON(): any;
     length: number;
+    equals(otherBuffer: Buffer): boolean;
+    compare(otherBuffer: Buffer): number;
     copy(targetBuffer: Buffer, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;
     slice(start?: number, end?: number): Buffer;
     writeUIntLE(value: number, offset: number, byteLength: number, noAssert?: boolean): number;