fix: reverts the perf change removing date-fns as it resulted in negl…

…igible savings

package.json

@@ -63,7 +63,6 @@
     "@vuepress/theme-default": "^2.0.0-rc.11",
     "commitizen": "^4.3.0",
     "cz-conventional-changelog": "^3.3.0",
-    "date-fns": "^3.6.0",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^9.1.0",
     "happy-dom": "^15.7.3",
@@ -87,6 +86,7 @@
     "**/*.{js,ts}": "eslint --fix"
   },
   "dependencies": {
+    "date-fns": "^3.6.0",
     "chalk": "^5.3.0",
     "vuepress-plugin-search-pro": "^2.0.0-rc.52"
   },

src/formatters/formatter.ts

@@ -1,4 +1,4 @@
-import { formatISO } from '../functions';
+import { formatISO } from 'date-fns/formatISO';
 import { LevelConfiguration, ModifierData } from '../_types';
 import { Configuration } from '../configuration';
 import {

src/formatters/json/json.ts

@@ -1,6 +1,6 @@
 import Formatter from '../formatter';
 import { ModifierData } from '../../_types';
-import { formatISO } from '../../functions';
+import { formatISO } from 'date-fns/formatISO';
 import { JsonLog, JsonLogOptionalFields, JsonLogRequiredFields } from './types';
 import { hasRequiredFields } from './type-guards';
 import { setup } from '../../functions';

src/formatters/standard/standard.ts

@@ -1,6 +1,6 @@
 import Formatter from '../formatter';
 import { ModifierData } from '../../_types';
-import { formatISO } from '../../functions';
+import { formatISO } from 'date-fns/formatISO';
 import { isNumber, isObject, isString } from '../../functions';
 
 /**

src/functions/data.ts

@@ -33,29 +33,3 @@ export function getActiveLevel(cfg: Configuration): number {
 export function leadingZero(num: number): string {
   return (num < 10 ? '0' : '') + `${num}`;
 }
-
-/**
- * Returns an ISO-8601 formatted string from the provided date.
- */
-export function formatISO(date: Date) {
-  const tzo = -date.getTimezoneOffset();
-  const dif = tzo >= 0 ? '+' : '-';
-
-  return (
-    `${date.getFullYear()}` +
-    '-' +
-    leadingZero(date.getMonth() + 1) +
-    '-' +
-    leadingZero(date.getDate()) +
-    'T' +
-    leadingZero(date.getHours()) +
-    ':' +
-    leadingZero(date.getMinutes()) +
-    ':' +
-    leadingZero(date.getSeconds()) +
-    dif +
-    leadingZero(Math.floor(Math.abs(tzo) / 60)) +
-    ':' +
-    leadingZero(Math.abs(tzo) % 60)
-  );
-}