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node_modules/indefinite/lib/rules/numbers.js

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+const NUMBERS = /^([0-9,]+)/;
+const EIGHT_ELEVEN_EIGHTEEN = /^(11|8|18)/;
+const ELEVEN_EIGHTEEN = /^(11|18)/;
+
+exports.check = (word) => NUMBERS.test(word);
+
+exports.run = (word, opts) => {
+  let number = word.toString().match(NUMBERS)[1].replace(/,/g, '');
+  let article = 'a';
+
+  if (EIGHT_ELEVEN_EIGHTEEN.test(number)) {
+    const startsWith11Or18 = ELEVEN_EIGHTEEN.test(number);
+
+    // If the number starts with 11 or 18 and is of length 4,
+    // the pronunciation is ambiguous so check opts.numbers to see
+    // how to render it. Otherwise, if it starts with 11 or 18
+    // and has 2, 5, 8, 11, etc. digits, use 'an.' Finally, if it
+    // starts with an 8, use 'an.' For everything else, use 'a.'
+    if (startsWith11Or18 && number.length === 4) {
+      article = opts.numbers === 'colloquial' ? 'an' : 'a';
+    } else if (startsWith11Or18 && (number.length - 2) % 3 === 0) {
+      article = 'an';
+    } else {
+      article = number.startsWith('8') ? 'an' : 'a';
+    }
+  }
+
+  return article;
+};