Create type definition for 'os-utils' (#4050)

src/@types/os-utils.d.ts

@@ -0,0 +1,30 @@
+declare module 'os-utils' {
+	type FreeCommandCallback = (usedmem: number) => void;
+
+	type HarddriveCallback = (total: number, free: number, used: number) => void;
+
+	type GetProcessesCallback = (result: string) => void;
+
+	type CPUCallback = (perc: number) => void;
+
+	export function platform(): NodeJS.Platform;
+	export function cpuCount(): number;
+	export function sysUptime(): number;
+	export function processUptime(): number;
+
+	export function freemem(): number;
+	export function totalmem(): number;
+	export function freememPercentage(): number;
+	export function freeCommand(callback: FreeCommandCallback): void;
+
+	export function harddrive(callback: HarddriveCallback): void;
+
+	export function getProcesses(callback: GetProcessesCallback): void;
+	export function getProcesses(nProcess: number, callback: GetProcessesCallback): void;
+
+	export function allLoadavg(): string;
+	export function loadavg(_time?: number): number;
+
+	export function cpuFree(callback: CPUCallback): void;
+	export function cpuUsage(callback: CPUCallback): void;
+}