Refactor units into a module

Author: t-bowersox

src/lib/time-diff.js

@@ -1,3 +1,5 @@
+import units from "./units.js";
+
 //#region Types
 
 /**
@@ -13,28 +15,6 @@
 
 //#endregion
 
-//#region Constants
-
-/** One minute in seconds. */
-const ONE_MIN = 60;
-
-/** One hour in seconds. */
-const ONE_HOUR = 60 * ONE_MIN;
-
-/** One day in seconds. */
-const ONE_DAY = 24 * ONE_HOUR;
-
-/** One week in seconds. */
-const ONE_WEEK = 7 * ONE_DAY;
-
-/** One month in seconds. */
-const ONE_MONTH = 4 * ONE_WEEK;
-
-/** One year in seconds. */
-const ONE_YEAR = 52 * ONE_WEEK;
-
-//#endregion
-
 //#region Classes
 
 /** Represents the difference between two times. */
@@ -47,12 +27,12 @@ export class TimeDiff {
 
   /** @type {Map<string, number>} */
   #units = new Map([
-    ["year", ONE_YEAR],
-    ["month", ONE_MONTH],
-    ["week", ONE_WEEK],
-    ["day", ONE_DAY],
-    ["hour", ONE_HOUR],
-    ["minute", ONE_MIN],
+    ["year", units.year],
+    ["month", units.month],
+    ["week", units.week],
+    ["day", units.day],
+    ["hour", units.hour],
+    ["minute", units.minute],
   ]);
 
   //#region Public API

src/lib/units.js

@@ -0,0 +1,26 @@
+export default {
+  /** One minute in seconds. */
+  get minute() {
+    return 60;
+  },
+  /** One hour in seconds. */
+  get hour() {
+    return this.minute * 60;
+  },
+  /** One day in seconds. */
+  get day() {
+    return this.hour * 24;
+  },
+  /** One week in seconds. */
+  get week() {
+    return this.day * 7;
+  },
+  /** One month in seconds. */
+  get month() {
+    return this.week * 4;
+  },
+  /** One year in seconds. */
+  get year() {
+    return this.day * 365;
+  },
+};