small refactors

src/byline.ts

@@ -0,0 +1,30 @@
+import type { Cheerio, Element } from 'cheerio'
+import { getInnerText } from './textUtils.js'
+
+const MATCH_ID_AND_CLASS = /byline|author|dateline|writtenby|p-author/i
+
+export function extractByline($node: Cheerio<Element>, matchString: string) {
+    const text = getInnerText($node)
+    if (!isValidByline($node.text())) return
+
+    const isAuthor = $node.attr('rel') === 'author'
+    if (isAuthor) return text
+
+    const hasAuthorItemprop = $node.attr('itemprop')?.includes('author')
+    if (hasAuthorItemprop) return text
+
+    const bylineMatch = MATCH_ID_AND_CLASS.test(matchString)
+    if (bylineMatch) return text
+
+    return
+}
+
+/**
+ * Check whether the input string could be a byline.
+ * This verifies that the input is a string, and that the length
+ * is less than 100 chars.
+ */
+export function isValidByline(byline: string) {
+    const length = byline.trim().length
+    return length > 0 && length < 100
+}