makeDocxBook: the docx blob goes straight to mammoth.convertToHtml
(mammoth unzips internally; the browser entry takes {arrayBuffer}, the
node entry {buffer}). Converted HTML is sectioned at block-element
boundaries into ~150KB chunks (string-level — no DOMParser), giving a
Part N TOC; images inline as data URIs by default.
makeBook: zip files whose entries contain word/document.xml route to
the docx branch before the EPUB fallback (previously they died inside
new EPUB(...) on the missing container.xml).
mammoth is the fork's first runtime dependency: updates and security
fixes flow via semver; the browser-field mappings swap its node unzip
for the browser one; the dynamic import keeps it out of every other
format's path.
makeTextBook: UTF-8 decode (BOM stripped), blank-line paragraph split,
hard-wrapped lines joined (natural reflow under font-size changes), HTML
escaped, sections capped at ~150KB at paragraph boundaries (small Part N
TOC, avoids one giant DOM). Sections expose load/createDocument/size per
the reflowable interface; positions for txt books are percentage-based
(sections get fake CFIs from index, same as other non-EPUB books).
makeBook: dispatches text/plain or .txt in the final non-zip/non-pdf
branch. EPUB/PDF/CBZ/MOBI/FB2 routing untouched.
Tests: offline node harness (isText, paragraph join/split, escaping,
section capping, TOC shape, dispatch incl. zip-still-routes-to-EPUB).
John O'Keefe