Validate Date & throw error with better error message

[dance2die]

To Do

• Add test cases for
  • getDates
  • getMatrix
• Add guard clause throwIfDateIsInvalid
  • Message: "Invalid date was passed"
• If date falls outside of min/max dates, throw an error throwIfDateIsOutOfRange
  • Message: "Date is out of range: It should be between x & x..."

Steps to reproduce

Pass bad date as an input to getDates or getMatrix.

const CalendarDates = require("calendar-dates");
const calendarDates = new CalendarDates();

const log = console.log;
// const may2018 = new Date(0,0,2);
const may2018 = 1;

mainAsync = async () => {
  const mayDates = await calendarDates.getDates(may2018);
  const mayMatrix = await calendarDates.getMatrix(may2018);
  // throw new Error('random error');
  log(`May, 2018 Dates`, mayDates);
  log(`May, 2018 Matrix`, mayMatrix);
};
mainAsync();

node v9.7.1 linux/amd64
   
(node:103) UnhandledPromiseRejectionWarning: TypeError: t.getMonth is not a function
    at getPreviousDates (/home/runner/node_modules/calendar-dates/dist/calendardates.cjs.js:1:1243)
    at /home/runner/node_modules/calendar-dates/dist/calendardates.cjs.js:1:663
    at new Promise (<anonymous>)
    at getDatesWithMetadata (/home/runner/node_modules/calendar-dates/dist/calendardates.cjs.js:1:628)
    at /home/runner/node_modules/calendar-dates/dist/calendardates.cjs.js:1:2193
    at new Promise (<anonymous>)
    at t.value (/home/runner/node_modules/calendar-dates/dist/calendardates.cjs.js:1:2160)
    at mainAsync (evalmachine.<anonymous>:9:40)
    at evalmachine.<anonymous>:15:1
    at Script.runInContext (vm.js:74:29)
(node:103) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 3)
(node:103) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
=> Promise { <pending> }

Try it here.
https://repl.it/@dance2die/calendar-date-edge-cases

Expected behavior

Report a better error message that the exception is thrown due to invalid date input.