typings: define types for os binding

PR-URL: #40222
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

tsconfig.json

@@ -6,6 +6,7 @@
     "./typings/internalBinding/http_parser.d.ts",
     "./typings/internalBinding/messaging.d.ts",
     "./typings/internalBinding/options.d.ts",
+    "./typings/internalBinding/os.d.ts",
     "./typings/internalBinding/serdes.d.ts",
     "./typings/internalBinding/timers.d.ts",
     "./typings/internalBinding/util.d.ts",

typings/internalBinding/os.d.ts

@@ -0,0 +1,21 @@
+declare function InternalBinding(binding: 'os'): {
+  getHostname(ctx: {}): string | undefined;
+  getLoadAvg(array: Float64Array): void;
+  getUptime(): number;
+  getTotalMem(): number;
+  getFreeMem(): number;
+  getCPUs(): Array<string | number>;
+  getInterfaceAddresses(ctx: {}): Array<string | number | boolean> | undefined;
+  getHomeDirectory(ctx: {}): string | undefined;
+  getUserInfo(options: { encoding?: string } | undefined, ctx: {}): {
+    uid: number;
+    gid: number;
+    username: string;
+    homedir: string;
+    shell: string | null;
+  } | undefined;
+  setPriority(pid: number, priority: number, ctx: {}): number;
+  getPriority(pid: number, ctx: {}): number | undefined;
+  getOSInformation(ctx: {}): [sysname: string, version: string, release: string];
+  isBigEndian: boolean;
+};