typings: add buffer internalBinding typing

typings/globals.d.ts

@@ -1,6 +1,7 @@
 import { AsyncContextFrameBinding } from './internalBinding/async_context_frame';
 import { AsyncWrapBinding } from './internalBinding/async_wrap';
 import { BlobBinding } from './internalBinding/blob';
+import { BufferBinding } from './internalBinding/buffer';
 import { ConfigBinding } from './internalBinding/config';
 import { ConstantsBinding } from './internalBinding/constants';
 import { DebugBinding } from './internalBinding/debug';
@@ -33,6 +34,7 @@ interface InternalBindingMap {
   async_context_frame: AsyncContextFrameBinding;
   async_wrap: AsyncWrapBinding;
   blob: BlobBinding;
+  buffer: BufferBinding;
   config: ConfigBinding;
   constants: ConstantsBinding;
   debug: DebugBinding;

typings/internalBinding/buffer.d.ts

@@ -0,0 +1,46 @@
+export interface BufferBinding {
+  atob(input: string): string | -1 | -2 | -3;
+  btoa(input: string): string | -1;
+
+  setBufferPrototype(proto: object): void;
+
+  byteLengthUtf8(str: string): number;
+  copy(source: ArrayBufferView, target: ArrayBufferView, targetStart: number, sourceStart: number, toCopy: number): number;
+  compare(a: ArrayBufferView, b: ArrayBufferView): number;
+  compareOffset(source: ArrayBufferView, target: ArrayBufferView, targetStart?: number, sourceStart?: number, targetEnd?: number, sourceEnd?: number): number;
+  fill(buf: ArrayBufferView, val: any, start?: number, end?: number, encoding?: number): -1 | -2 | void;
+  indexOfBuffer(haystack: ArrayBufferView, needle: ArrayBufferView, offset?: number, encoding?: number, isForward?: boolean): number;
+  indexOfNumber(buf: ArrayBufferView, needle: number, offset?: number, isForward?: boolean): number;
+  indexOfString(buf: ArrayBufferView, needle: string, offset?: number, encoding?: number, isForward?: boolean): number;
+
+  copyArrayBuffer(destination: ArrayBuffer | SharedArrayBuffer, destinationOffset: number, source: ArrayBuffer | SharedArrayBuffer, sourceOffset: number, bytesToCopy: number): void;
+
+  swap16(buf: ArrayBufferView): ArrayBufferView;
+  swap32(buf: ArrayBufferView): ArrayBufferView;
+  swap64(buf: ArrayBufferView): ArrayBufferView;
+
+  isUtf8(input: ArrayBufferView | ArrayBuffer | SharedArrayBuffer): boolean;
+  isAscii(input: ArrayBufferView | ArrayBuffer | SharedArrayBuffer): boolean;
+
+  kMaxLength: number;
+  kStringMaxLength: number;
+
+  asciiSlice(start: number, end: number): string;
+  base64Slice(start: number, end: number): string;
+  base64urlSlice(start: number, end: number): string;
+  latin1Slice(start: number, end: number): string;
+  hexSlice(start: number, end: number): string;
+  ucs2Slice(start: number, end: number): string;
+  utf8Slice(start: number, end: number): string;
+
+  base64Write(str: string, offset?: number, maxLength?: number): number;
+  base64urlWrite(str: string, offset?: number, maxLength?: number): number;
+  hexWrite(str: string, offset?: number, maxLength?: number): number;
+  ucs2Write(str: string, offset?: number, maxLength?: number): number;
+
+  asciiWriteStatic(buf: ArrayBufferView, str: string, offset?: number, maxLength?: number): number;
+  latin1WriteStatic(buf: ArrayBufferView, str: string, offset?: number, maxLength?: number): number;
+  utf8WriteStatic(buf: ArrayBufferView, str: string, offset?: number, maxLength?: number): number;
+
+  getZeroFillToggle(): Uint32Array | void;
+}