fix(types): PKG-CHAPTER-04 preserve CJS ESM and legacy consumer contracts

test/types/commonjs.cts

@@ -0,0 +1,13 @@
+import Artplayer = require('artplayer')
+import chapter = require('artplayer-plugin-chapter')
+import legacy = require('artplayer-plugin-chapter/legacy')
+import french = require('artplayer/i18n/fr')
+
+const option: Artplayer.Option = { container: '#player', url: 'video.mp4', i18n: { fr: french } }
+const art: Artplayer = new Artplayer(option)
+const result: chapter.Result = chapter()(art)
+const old: legacy.Result = legacy()(art)
+result.update({})
+old.update({})
+// @ts-expect-error CommonJS callers retain strict endpoint types.
+chapter({ chapters: [{ start: '0', end: 8, title: 'Invalid' }] })