feat: working data download and indexing

src/lib/logger.mjs

@@ -0,0 +1,35 @@
+/* eslint no-console: 0 */
+import zeroPad from './zero-pad.mjs';
+
+const getTimestamp = () => {
+  const d = new Date();
+  return `${[d.getFullYear(), zeroPad(d.getMonth() + 1, 2), zeroPad(d.getDate(), 2)].join('/')} ${[
+    zeroPad(d.getHours(), 2),
+    zeroPad(d.getMinutes(), 2),
+    zeroPad(d.getSeconds(), 2),
+  ].join(':')}`;
+};
+
+const wrapMessage = msg => `[${getTimestamp()}]: ${msg.map(m => JSON.stringify(m)).join(' ')}`;
+
+const logger = {
+  log(...args) {
+    console.log(wrapMessage(args));
+  },
+  warn(...args) {
+    console.warn(wrapMessage(args));
+  },
+  error(...args) {
+    if (args[0] instanceof Error) {
+      console.error(getTimestamp(), args[0].stack);
+      return;
+    }
+    console.error(wrapMessage(args));
+  },
+  debug(...args) {
+    if (!process.env.DEBUG) return;
+    console.log(wrapMessage(args));
+  },
+};
+
+export default logger;