export const constants: {
  signals: Record<string, number>
  errnos: Record<string, number>
  priority: Record<string, number>
}

export const EOL: '\r\n' | '\n'

export const devNull: '\\\\.\\nul' | '/dev/null'

export function platform(): 'android' | 'darwin' | 'ios' | 'linux' | 'win32'

export function arch(): 'arm' | 'arm64' | 'ia32' | 'x64'

export function type(): string

export function version(): string

export function release(): string

export function machine(): string

export function execPath(): string

export function pid(): number

export function ppid(): number

export function cwd(): string

export function chdir(dir: string): string

export function tmpdir(): string

export function homedir(): string

export function hostname(): string

export interface NetworkInterface {
  address: string
  netmask: string
  family: 'IPv4' | 'IPv6'
  cidr: string
  mac: string
  internal: boolean
  scopeid?: number
}

export function networkInterfaces(): Record<string, NetworkInterface[]>

export function kill(pid: number, signal?: string | number): void

export interface UserInfo {
  uid: number
  gid: number
  username: string
  homedir: string
  shell: string | null
}

export function userInfo(uid?: number): UserInfo

export interface GroupInfo {
  groupname: string
  gid: number
  members: string[]
}

export function groupInfo(gid?: number): GroupInfo | null

export function endianness(): 'LE' | 'BE'

export function availableParallelism(): number

export interface CpuUsage {
  user: number
  system: number
}

export function cpuUsage(previous?: CpuUsage): CpuUsage

export function threadCpuUsage(previous?: CpuUsage): CpuUsage

export function resourceUsage(): {
  userCPUTime: number
  systemCPUTime: number
  maxRSS: number
  sharedMemorySize: number
  unsharedDataSize: number
  unsharedStackSize: number
  minorPageFault: number
  majorPageFault: number
  swappedOut: number
  fsRead: number
  fsWrite: number
  ipcSent: number
  ipcReceived: number
  signalsCount: number
  voluntaryContextSwitches: number
  involuntaryContextSwitches: number
}

export function memoryUsage(): {
  rss: number
  heapTotal: number
  heapUsed: number
  external: number
}

export function freemem(): number

export function totalmem(): number

export function availableMemory(): number

export function constrainedMemory(): number

export function uptime(): number

export function loadavg(): ArrayLike<number>

export function cpus(): {
  model: string
  speed: number
  times: {
    user: number
    nice: number
    sys: number
    idle: number
    irq: number
  }
}[]

export function getProcessTitle(): string

export function setProcessTitle(title: unknown): void

export function getPriority(pid?: number): number

export function setPriority(priority: number): void
export function setPriority(pid: number, priority: number): void

export function getEnvKeys(): string[]

export function getEnv(name: string): string | undefined

export function hasEnv(name: string): boolean

export function setEnv(name: string, value: string): void

export function unsetEnv(name: string): void
