[Proposal] Extract @plannotator/core npm package (parser + types) for cross-platform reuse

[theflysurfer]

Hi! Big fan of Plannotator. I've been maintaining a React Native port in our fork (theflysurfer/Happier — Happy mobile app) since early 2026.

The port currently re-implements your parser + types from scratch, which drifts. I'd love to consume parts of upstream directly as an npm dep.

Proposal: extract these into a @plannotator/core package (zero runtime deps, pure logic):

• packages/ui/utils/parser.ts (parseMarkdownToBlocks, extractFrontmatter, HTML_BLOCK_TAGS)
• packages/ui/utils/planDiffEngine.ts
• packages/ui/types.ts (Block, Annotation, AnnotationType, AlertKind)

Benefits:

• RN/mobile users can consume the parsing logic directly
• UI implementations stay platform-specific (web/Bun upstream, RN downstream)
• Updates flow naturally instead of via manual mirroring

Happy to open a PR if there's interest. Otherwise I'll keep mirroring manually.

(Note: our RN port is on the older API — INSERTION/REPLACEMENT annotation types — we'll catch up.)

[backnotprop]

Hey definitely. Im moving towards some big changes in #733 and #734 to enable better interoperability on a desktop & enable some enterprise capabilities folks have asked for, but I can certainly support the move towards a core package.

Sounds cool. Glad to hear it. It's provided use outside of its initial show.