pretext-builder

Pretext: zero-reflow text measurement & layout via canvas measureText + pure arithmetic. Build height prediction, chat bubble shrinkwrap, masonry grids, multi-column editorial flow, obstacle-aware text routing, rich inline content, canvas/SVG rendering. Use when: 'text height', 'virtual scroll', 'masonry layout', 'pretext', 'React pretext hook', 'React layout', 'chat bubble'. Also trigger on '文字排版', '文本高度', '前端排版', 'React 虚拟列表', 'React 高度预测'.