Convert to Typescript

src/commands/birthday.ts

@@ -0,0 +1,68 @@
+import { SlashCommandBuilder, ChatInputCommandInteraction } from 'discord.js';
+import {
+  format,
+  differenceInYears,
+  differenceInMonths,
+  differenceInDays,
+  addYears,
+  isToday,
+} from 'date-fns';
+
+const BIRTHDAY_TIMESTAMP = 1582576229;
+
+// Initialise the command data.
+export const data = new SlashCommandBuilder()
+  .setName('birthday')
+  .setDescription("Returns ButlerBot's Birthday information.");
+
+console.log(`Loaded ${data.name} command.`);
+
+/**
+ * Responds with ButlerBot's age and the time remaining until the next birthday.
+ * @param interaction The interaction that triggered the command.
+ * @returns A promise that resolves when the command is finished executing.
+ */
+export async function execute(
+  interaction: ChatInputCommandInteraction
+): Promise<void> {
+  const today = new Date();
+  const birthday = new Date(BIRTHDAY_TIMESTAMP * 1000);
+
+  const ageYears = differenceInYears(today, birthday);
+  const ageMonths = differenceInMonths(today, birthday) % 12;
+  const ageDays = differenceInDays(today, addYears(birthday, ageYears)) % 30;
+
+  let ageMessage = `I am ${ageYears} year`;
+  ageMessage += ageYears !== 1 ? 's, ' : ', ';
+  ageMessage += `${ageMonths} month`;
+  ageMessage += ageMonths !== 1 ? 's ' : ' ';
+  ageMessage += `and ${ageDays} day`;
+  ageMessage += ageDays !== 1 ? 's ' : ' ';
+  ageMessage += 'old!';
+
+  let birthdayMessage = `I was created on ${format(birthday, 'dd MMMM yyyy')}.`;
+
+  const nextBirthdayYear =
+    today.getMonth() > birthday.getMonth() ||
+    (today.getMonth() === birthday.getMonth() &&
+      today.getDate() >= birthday.getDate())
+      ? today.getFullYear() + 1
+      : today.getFullYear();
+  const nextBirthday = new Date(
+    nextBirthdayYear,
+    birthday.getMonth(),
+    birthday.getDate()
+  );
+  const countdown = differenceInDays(nextBirthday, today);
+
+  if (isToday(nextBirthday)) {
+    birthdayMessage += " It's my Birthday today!";
+  } else if (countdown === 1) {
+    birthdayMessage += " It's my Birthday tomorrow!";
+  } else {
+    birthdayMessage += ` It's my Birthday in ${countdown} days!`;
+  }
+
+  const fullMessage = `${ageMessage} ${birthdayMessage}`;
+  await interaction.reply(fullMessage);
+}