🎪 Compose periodical messages with Deno Cron

periodic-message.ts

import { api as Misskey } from "npm:misskey-js";

type Meta = {
  misskey: Readonly<{ origin: string; credential: string }>;
};

const getMeta = (): Meta => {
  const meta = {
    misskey: {
      origin: Deno.env.get("MISSKEY_ORIGIN"),
      credential: Deno.env.get("MISSKEY_CREDENTIAL"),
    },
  };

  const missedEnv: string[] = [];
  for (const [prefix, props] of Object.entries(meta)) {
    for (const [suffix, val] of Object.entries(props)) {
      if (!val) missedEnv.push(`$${`${prefix}_${suffix}`.toUpperCase()}`);
    }
  }
  if (missedEnv.length > 0) {
    throw new Error(`Missed env: ${missedEnv.join(", ")}`);
  }

  return meta as Meta;
};

const postMisskey = async (
  opts: { origin: string; credential: string },
  text: string,
): Promise<string> => {
  const cli = new Misskey.APIClient(opts);
  const meta = await cli.request("notes/create", { text });
  return `${opts.origin}/notes/${meta.createdNote.id}`;
};

try {
  const { misskey } = getMeta();

  Deno.cron("New Year", "0 15 31 12 *", async (): Promise<void> => {
    const year: string = new Date().toLocaleString("en", {
      year: "numeric",
      timeZone: "JST",
    });
    const text = `🎍 Happy New Year ${year}!`;

    console.log(`🪐 Misskey: ${await postMisskey(misskey, text)}`);
  });

  console.log("👟 All periodical messages are ready!");
} catch (error: unknown) {
  console.error(`🚨 ${(error as Error).message}`);
  Deno.exit(1);
}

1. Replace the default code with this

   import "https://gist.githubusercontent.com/5ouma/554551fd9edb34cb218ad41e8350fcc9/raw/periodic-message.ts";

2. Set the environment variables

   • MISSKEY_ORIGIN
   • MISSKEY_CREDENTIAL