Goal

Pull packages/slate-browser from .tmp/slate-v2-draft into live .tmp/slate-v2 with honest Bun-era wiring.

Facts

• live .tmp/slate-v2 does not have packages/slate-browser
• draft slate-browser is real and includes:
  • source
  • package-local tests
  • README
  • multi-subpath exports:
    • .
    • ./core
    • ./browser
    • ./playwright
    • ./transports
• live tsdown config only builds src/index.ts, so subpath exports need package-local build config or they will lie
• old draft root wiring includes a lot of dead pnpm / rollup / e2e script baggage that should not come back blindly

Relevant Learnings

• workspace packages need live root index.ts source entries
• browser proof helpers must normalize zero-width selection and wait for selection sync
• browser proof lanes must use fresh built output, not stale dist

Plan

1. copy the draft slate-browser package source, tests, and docs without dist/node_modules junk
2. adapt the package to live Bun + tsdown conventions
3. add only the root wiring that is still required:
   • workspace dependency/reference
   • Playwright TS path alias for slate-browser/playwright
   • root convenience scripts for the package-local suite
4. verify build, typecheck, lint, and the package-local tests

Progress

• loaded roadmap, migration plan, and slate-browser-related learnings
• confirmed the live repo has current Playwright tests but not the old full replacement-proof command surface
• identified the main technical blocker up front: multi-entry/subpath packaging under tsdown
• copied packages/slate-browser source, tests, and docs from .tmp/slate-v2-draft into live .tmp/slate-v2
• replaced the old rollup/pnpm package wiring with:
  • package-local multi-entry tsdown
  • Bun-era package scripts
  • split TS configs for build vs source/browser-test typecheck
• updated live docs/slate-v2/** so the package no longer shows up as deferred
• captured the reusable packaging lesson in docs/solutions/developer-experience/2026-04-18-slate-browser-multi-subpath-packages-need-local-tsdown-entry-maps-and-split-test-runtime-typecheck-ownership.md

Verification

• cd /Users/zbeyens/git/slate-v2 && bun install
• cd /Users/zbeyens/git/slate-v2 && bunx turbo build --filter=./packages/slate-browser
• cd /Users/zbeyens/git/slate-v2 && bunx turbo typecheck --filter=./packages/slate-browser
• cd /Users/zbeyens/git/slate-v2 && bun run lint:fix
• cd /Users/zbeyens/git/slate-v2 && bun run test:slate-browser
• cd /Users/zbeyens/git/slate-v2 && bun run typecheck:root
• cd /Users/zbeyens/git/slate-v2 && ./node_modules/.bin/tsc --project ./playwright/tsconfig.json --noEmit