Goal

Hard-cut Rollup from /Users/zbeyens/git/slate-v2, move package builds to tsdown, and publish ESM-only package output.

Decisions

• keep package output ESM-only
• cut cjs and umd
• use a shared config/tsdown.config.mts shaped after Plate's architecture, not Plate's exact config
• keep Next dev resolving package src directly so HMR does not depend on package builds

Implementation

• added /Users/zbeyens/git/slate-v2/config/tsdown.config.mts
• deleted /Users/zbeyens/git/slate-v2/config/rollup/rollup.config.js
• deleted /Users/zbeyens/git/slate-v2/scripts/sync-package-types.mjs
• converted package manifests to ESM-only dist/index.js + dist/index.d.ts
• switched package build scripts to tsdown
• simplified root dev to pnpm serve
• switched Jest to source mapping for workspace packages so ESM dist does not break the test lane
• fixed slate-dom public DOM helper type exports for bundled declarations

Verification

• pnpm install
• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm build

HMR Proof

• reused the live Next dev server on http://localhost:3100
• opened /examples/plaintext
• typed editor content into the page
• patched packages/slate-react/src/components/string.tsx temporarily to add a probe attribute
• observed the open page update to include the new attribute while preserving the typed text
• reverted the probe patch

That proves the app is consuming package src live in dev without any package build step.