feat: parse abbreviated counts like "59 млн" and "571 тыс."

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

test/numbers.test.js

@@ -0,0 +1,62 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { parseCount, parseViews } from '../src/lib/numbers.js';
+
+test('parseCount understands Russian abbreviations', () => {
+  assert.equal(parseCount('59 млн'), 59000000);
+  assert.equal(parseCount('59 млн'), 59000000); // non-breaking space, as YouTube renders it
+  assert.equal(parseCount('571 тыс.'), 571000);
+  assert.equal(parseCount('1,8 млн'), 1800000);
+  assert.equal(parseCount('3,4 млрд'), 3400000000);
+  assert.equal(parseCount('123 тысячи'), 123000);
+  assert.equal(parseCount('1,8 миллиона'), 1800000);
+  assert.equal(parseCount('146 миллионов'), 146000000);
+});
+
+test('parseCount understands English abbreviations', () => {
+  assert.equal(parseCount('1.2M'), 1200000);
+  assert.equal(parseCount('1.2m'), 1200000);
+  assert.equal(parseCount('123K'), 123000);
+  assert.equal(parseCount('1.5B'), 1500000000);
+  assert.equal(parseCount('2.5 million'), 2500000);
+});
+
+test('parseCount reads plain and grouped integers', () => {
+  assert.equal(parseCount('37'), 37);
+  assert.equal(parseCount('0'), 0);
+  assert.equal(parseCount('12 345'), 12345);
+  assert.equal(parseCount('12 345'), 12345);
+  assert.equal(parseCount('1,234,567'), 1234567);
+  assert.equal(parseCount('1.234.567'), 1234567);
+});
+
+test('parseCount ignores trailing "views" and "subscribers" words', () => {
+  assert.equal(parseCount('59 миллионов просмотров'), 59000000);
+  assert.equal(parseCount('1 просмотр'), 1);
+  assert.equal(parseCount('571 тыс. подписчиков'), 571000);
+  assert.equal(parseCount('1.2M views'), 1200000);
+  assert.equal(parseCount('1.2M subscribers'), 1200000);
+});
+
+test('parseCount rejects anything that is not wholly a count', () => {
+  for (const text of ['', 'Wun Wun', '10 л. назад', '2 г. назад', '7 дн. назад', '3 нед. назад', '1,2 тыс. зрителей', '5 Minute Crafts', 'abc', '1.2', '1,5']) {
+    assert.equal(parseCount(text), null, text);
+  }
+  for (const value of [null, undefined, 123, {}]) {
+    assert.equal(parseCount(value), null, String(value));
+  }
+});
+
+test('parseViews adds the "no views" cases', () => {
+  assert.equal(parseViews('Нет просмотров'), 0);
+  assert.equal(parseViews('No views'), 0);
+  assert.equal(parseViews('59 млн'), 59000000);
+  assert.equal(parseViews('1,8 млн просмотров'), 1800000);
+  assert.equal(parseViews('1.2M views'), 1200000);
+});
+
+test('parseViews rejects dates and names', () => {
+  for (const text of ['10 л. назад', 'Wun Wun', '2 years ago', null, undefined]) {
+    assert.equal(parseViews(text), null, String(text));
+  }
+});