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Added a script which allows to compare two versions to check what's c…
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ellenaua committed Oct 19, 2019
1 parent 0c35148 commit 6ff5e30
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90 changes: 90 additions & 0 deletions scripts/compare-versions.js
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/* jshint esversion: 6 */

const assert = require('assert');

const FROM_YEAR = 1970;
const TO_YEAR = 2050;

compareVersions('2019b', 'latest');

function compareVersions(v1, v2, timezones = 'all') {

/**
* Get moment-timezone version v1
*/
const version1 = require("../moment-timezone");
version1.tz.load(require(`../data/packed/${v1}.json`));

/**
* Get timezone names and dates from v1
*/
const names1 = version1.tz.names();
const dates1 = getFormattedDates(version1, timezones);

/**
* Clear cache
*/
delete require.cache[require.resolve('moment')]
delete require.cache[require.resolve('../moment-timezone')]

/**
* Get moment-timezone version v2
*/
var version2 = require("../moment-timezone");
version2.tz.load(require(`../data/packed/${v2}.json`));

/**
* Get timezone names and dates from v2
*/
const names2 = version1.tz.names();
const dates2 = getFormattedDates(version2, timezones);

console.log(`Comparing versions ${v1} and ${v2} from ${FROM_YEAR} to ${TO_YEAR}`);

/**
* Compare timezone names
*/
names1.forEach((name1, i) => {
if (name1 !== names2[i]) {
console.log(`${name1} !== ${names2[i]}`);
}
});

/**
* Compare dates
*/
dates1.forEach((date1, i) => {
if (date1.formatted !== dates2[i].formatted) {
console.log(`${date1.zone}: ${date1.date} = ${dates1[i].formatted} in ${v1}, ${dates2[i].formatted} in ${v2}`)
}
});
}

/**
* Iterates from FROM_YEAR to TO_YEAR
* and returns formatted dates for each timezone for each month
*
* @param momentInstance - instance of moment with timezone
* @param timezones = 'all' or array of timezones you want to check
* @return {Array}
*/
function getFormattedDates (momentInstance, timezones = 'all') {
const names = timezones === 'all' ? momentInstance.tz.names() : timezones;
const dates = [];

// ensure that names are equal
names.forEach((name, i) => {
for (let year = FROM_YEAR; year <= TO_YEAR; year++) {
for (let month = 1; month <= 12; month++) {
const monthFormatted = month < 10 ? '0' + month : month;
dates.push({
zone: name,
date: `${year}-${monthFormatted}-01T00:00:00Z`,
formatted: momentInstance(`${year}-${monthFormatted}-01T00:00:00Z`).tz(name).format()
});
}
}
});

return dates;
}

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