## Problem
The published declaration files for `@copilotkit/react-core`,
`@copilotkit/react-ui`, and `@copilotkit/react-textarea` contain imports
that TypeScript cannot resolve, so **`attw` (Are The Types Wrong)
reports `InternalResolutionError` across every resolution mode**
(`node10` / `node16` / `bundler`). In `@copilotkit/react-core` this was
being **masked in CI** by `--ignore-rules internal-resolution-error` on
the package's `attw` script — so the existing `check:packages` gate
looked green while consumers under `moduleResolution:
bundler`/`node16`/`nodenext` got broken types (the symptom reported in
#3324: `has no exported member 'useAgent'`, etc.).
Two distinct artifacts leaked into the emitted `.d.ts` / `.d.cts` /
`.d.mts` (neither affects the JS bundles):
1. **Side-effect CSS imports** — `import "./index.css"` is intentionally
kept in the JS so styles auto-load for bundler consumers, but
`rolldown-plugin-dts` also left it in the declarations, where TypeScript
can't resolve a `.css` as a typed module.
2. **Extensionless relative `./context` import** —
`@copilotkit/react-core/v2/headless` re-exports the externalized context
module; the JS bundle correctly externalizes it to
`@copilotkit/react-core/v2/context`, but the declaration kept the
relative `./context`, which is invalid in ESM declarations.
> Note: this is **not** the missing-`exports.types`-condition theory
from #3324. tsdown deliberately relies on co-located `.d.mts`/`.d.cts`
siblings; `@copilotkit/core` already resolves cleanly. The real defects
are the two leaked imports above.
## Fix
A small tsdown `build:done` hook post-processes the emitted declarations
**on disk** (after every format is written, so it catches both `.d.mts`
and `.d.cts`):
- strips side-effect CSS imports from declarations (JS keeps them);
- rewrites the relative `./context` import to the
`@copilotkit/react-core/v2/context` package path (matching how the JS
bundle externalizes it).
Also:
- **Removed the `--ignore-rules internal-resolution-error` band-aid**
from `react-core`'s `attw` script so the existing CI gate validates for
real.
- **Dropped the dead `codeSplitting` option** from the UMD configs —
tsdown never reads it (it's a rolldown-only key), and it was failing
`tsc` in the configs that type-check themselves. UMD output is unchanged
(single file).
## Verification
- All three packages build; **no CSS or relative-`./context` imports
remain in any declaration**, while the JS bundles still contain them
(styles auto-load preserved).
- `attw` + `publint` pass for all packages **with no suppression**
(`react-core`'s `/v2`, `/v2/headless`, `/v2/context` are green for
node16-cjs/esm/bundler).
- Unit tests pass.
- A standalone consumer project (real tarball install, `skipLibCheck:
false`) type-checks the public APIs — including `useAgent` /
`useFrontendTool` / `useConfigureSuggestions` — cleanly under **both
`bundler` and `nodenext`**, and the headless↔context class is nominally
identical.
## Out of scope (follow-ups)
- `@copilotkit/react-native`: its `--ignore-rules
internal-resolution-error` currently suppresses nothing (no IRE) and it
has a separate `NoResolution` flag.
- `@copilotkit/vue`: a large, genuine set of `.vue`/relative-import
declaration errors unrelated to this change.
Relates to #3324.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Repairs TypeScript check-types across the monorepo and adds a CI gate so
regressions are caught going forward:
- core: bundler module resolution and strict-mode fixes
- sdk-js: bundler module resolution; keep codegen, formatter, packaging working
- react-core: fixes across components, hooks, and tests
- react-native: restore catch binding referenced by TypeError cause
- runtime: repair check-types and bound AI SDK schema inference
- web-inspector: nodenext import extensions, export Anchor
- remaining packages and node example: assorted check-types repairs
- deps: add missing type-only devDependencies
- license context driven from /info licenseStatus
- ci: run check-types in the static quality workflow
Squashed from 12 commits for a single, easily-revertable change.
The emitted declaration files for @copilotkit/react-core, react-ui and
react-textarea contained imports TypeScript cannot resolve, so `attw`
reported InternalResolutionError across every resolution mode (the error
was being masked in react-core by `--ignore-rules internal-resolution-error`):
- Side-effect CSS imports (e.g. `import "./index.css"`) leaked into the
.d.ts/.d.cts/.d.mts output. CSS is intentionally kept in the JS bundles
(styles auto-load for bundler consumers); only the declarations are cleaned.
- The headless re-export of the externalized context module was emitted as a
relative, extensionless `./context` import, which is invalid in ESM
declarations.
Fix: a tsdown `build:done` hook post-processes the emitted declarations on
disk (strips CSS side-effect imports; rewrites the relative `./context`
import to the `@copilotkit/react-core/v2/context` package path). Removed the
react-core `attw` band-aid so the existing CI gate validates for real, and
dropped the dead `codeSplitting` option (tsdown never reads it) that was
failing type-checks in the configs that include them.
Verified: all three packages build; no CSS/relative-context imports remain in
any declaration while the JS bundles are unchanged; attw + publint pass with
no suppression; tests pass; and a standalone consumer project type-checks the
public APIs cleanly under both bundler and nodenext with skipLibCheck off.
Adds two CI signals for keeping the published packages small and broadly compatible:
- Bundle size: size-limit file-mode config across packages plus a
CopilotChat import-size regression signal (gzip) so growth in the
headline consumer entrypoint is visible on every PR. A bundle-size
workflow comments results on the PR (Phase 1: no hard-fail).
- ES compatibility: a compat-check (es-check) script across 9 packages
with a root .browserslistrc, validating built .mjs/.cjs against the
es2022 build target.
The measure script is importable (measureBundle) and unit-tested. Dev
docs live under dev-docs/ (bundle-size.md, browser-compat.md). All
action refs are pinned to full commit SHAs for supply-chain safety.
tylerslaton