Function that checks if parameter is an array that contains strings

index.ts

const checkIfArrayOfStrings = (arrayToCheck: any): boolean => {
  if (arrayToCheck && arrayToCheck instanceof Array && arrayToCheck.length) {
    const arrayOfNonStringValues = arrayToCheck.filter((value: any) => {
      return typeof value !== 'string';
    });

    return arrayOfNonStringValues && arrayOfNonStringValues.length
  }
  return false;
};