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node_modules/indefinite/lib/rules/other.js

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+const { startsWithVowel } = require('../helpers');
+const irregulars = require('../irregular-words');
+const EXTRAS = /[\s'-]/;
+
+const getFirst = word => word.split(EXTRAS)[0].toLowerCase();
+
+const xor = (a, b) => (a || b) && !(a && b);
+
+/**
+ * Try some variations on the word to determine whether it's irregular.
+ * Specifically, try trimming s, then es, then ed because those are common
+ * forms of plurals and past tense verbs (which can be used like adjectives).
+ */
+const checkForIrregulars = part => [ null, 's', 'es', 'ed' ].reduce((memo, ending) => memo || irregulars.check(part, ending), false);
+
+exports.check = () => true;
+
+exports.run = (word, opts) => {
+  // Only check the first word. Also, if it's hyphenated, only
+  // check the first part. Finally, if it's possessive, ignore
+  // the possessive part.
+  let first = getFirst(word);
+  let isIrregular = checkForIrregulars(first);
+
+  /**
+  * If it starts with a vowel and isn't irregular: "an"
+  * If it starts with a vowel and IS irregular: "a"
+  * If it starts with a consonant and isn't irregular: "a"
+  * If it starts with a consonant and IS irregular: "an"
+  */
+  let article = xor(startsWithVowel(word), isIrregular) ? 'an' : 'a';
+  return article;
+};