Check if a value is a string

JavaScript version
const isString = (value) => Object.prototype.toString.call(value) === '[object String]';
TypeScript version
const isString = (value: any): boolean => Object.prototype.toString.call(value) === '[object String]';
Examples
isString('hello world'); // true
isString(new String('hello world')); // true
isString(10); // false