message: Unused private var
diff: @@ -364,7 +364,6 @@ interface MessageResolutionCallbacks {
  export class CMakeServerClient {
  - private _proc: child_proc.ChildProcess;
  private _accInput: string = '';
  private readonly _promisesResolvers: Map<string, MessageResolutionCallbacks> = new Map;
  private readonly _params: ClientInitPrivate;
  @@ -522,7 +521,7 @@ export class CMakeServerClient {
  this._pipeFilePath = pipe_file;
  const final_env = util.mergeEnvironment(process.env as proc.EnvironmentVariables,
  params.environment as proc.EnvironmentVariables);
  - const child = this._proc
  + const child
  = child_proc.spawn(params.cmakePath, ['-E', 'server', '--experimental', `--pipe=${pipe_file}`], {
  env: final_env, cwd: params.binaryDir
  });
  @@ -546,7 +545,6 @@ export class CMakeServerClient {
  });
  const exit_promise = new Promise<void>(resolve => { child.on('exit', () => { resolve(); }); });
  this._endPromise = Promise.all([end_promise, exit_promise]).then(() => {});
  - this._proc = child;
  child.on('close', (retc: number, signal: string) => {
  if (retc !== 0) {
  log.error('The connection to cmake-server was terminated unexpectedly');
  