message: Remove isBoolean
diff: @@ -33,10 +33,6 @@ export function getUnixTempDirectory(){
  return envTmp;
  }
  -export function isBoolean(obj: any): obj is boolean {
  - return obj === true || obj === false;
  -}
  -
  export function sum<T>(arr: T[], selector: (item: T) => number): number {
  return arr.reduce((prev, curr) => prev + selector(curr), 0);
  }
  