refactor(openui): use @openuidev/lang-core and react-lang for OpenUI Lang

[Aditya-thesys]

Summary

Replaces the from-scratch OpenUI Lang implementation in packages/openui with @openuidev/lang-core, the reference implementation of the language, and moves the airbnb example client to @openuidev/react-lang. Noetic's own architecture is untouched: same OutputCodec contract, same openui.node / openui.state / openui.query event vocabulary, same wire protocol and surface layer semantics.

What changed:

• library.ts: createLibrary / defineComponent / systemPrompt / validateDocument delegate to lang-core (prompt generation, JSON schema, structural parse errors). Literal prop values are still checked against the library's own Zod schemas. After the review-round fixes, validation covers the whole document (orphan statements get their own resolution pass, root-less turns included), missing required props are reported, and cross-turn references are never flagged. systemPrompt() accepts lang-core PromptOptions, defaults to the full interactive vocabulary, and names a real registered component in the root instruction.
• lang/parser.ts: the ~526 line recursive-descent expression parser is gone. What remains is a bracket- and string-aware statement scanner (~65 lines) that finds statement boundaries in the stream, because the transport emits one frame per completed statement and lang-core's streaming parser returns tree snapshots rather than per-statement source. lang/document.ts keeps the ordered statement view the surface needs and adds resolveDocument() for lang-core's resolved ParseResult.
• codec.ts, fragment.ts: rebuilt on the new model, same public behavior.
• layer/surface.ts, server/*, predicates.ts: unchanged behavior (one rename: serializeAssignment is now serializeStatement).
• examples/openui-airbnb: the client's hand-rolled render.tsx (232 lines) and the @openui/* source aliases are replaced by react-lang's Renderer; the demo server is updated to the renamed statement API.

Net -631 lines. Tests: 51 pass / 0 fail (was 50 / 0; one test added for resolveDocument). The rewritten tests are the ones that asserted internals of the removed parser or exact prompt wording.

Related issue

Closes #82.

Type of change

• Bug fix (fix:)
• New feature (feat:)
• Refactor / internal (refactor:, chore:, perf:)
• Docs (docs:)
• Breaking change (includes a BREAKING CHANGE: footer)

Checklist

• My commits are signed off (DCO): git commit -s — the DCO check must pass.
• Commit messages follow Conventional Commits with a package scope.
• Tests added or updated, and bun test passes (51/0 in packages/openui).
• bun run lint and typecheck pass (biome clean, tsc --noEmit clean; example client tsc and vite build clean).
• Specs/docs updated where behavior changed. Spec 28 describes behavior at a level this PR preserves (statement events, document folding, library validation), so no spec edit was needed.
• sentrux gate . is clean. I could not run sentrux locally (binary not distributed with the repo); no packages or top-level directories were added and no internal import layering changed, so I expect the CI gate to pass.
• If I added a package or a new top-level directory, I updated .sentrux/rules.toml in the same commit. (Not applicable, only a new external npm dependency on @openuidev/lang-core in packages/openui.)

Notes for reviewers

• The API rename that ripples outward is UiDocument.assignments to UiDocument.statements (entries now carry {ref, kind, source, line} instead of a parsed expression tree). The only external consumer was the airbnb demo server, updated here.
• The earlier claim here that validation was a strict superset of the old behavior was wrong, as the review showed. The fix commit restores statement-level diagnostics (a structural lang-core parse gates admission), extends validateDocument to unreachable and root-less statements, and adds regression tests for each repro from the review, including the restored 'bad = Card(' fixture.
• Open question, happy to do as a follow-up: if the transport moved to shipping accumulated source instead of per-statement frames, the remaining statement scanner and statement model could be deleted as well, and src/lang/ would collapse to a thin re-export of lang-core. That is a bigger change to the transport design, so I kept it out of this PR. Raised at the end of packages/openui reimplements OpenUI Lang instead of using the reference @openuidev packages #82.

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[mattapperson]

Thanks for this — I want this consolidation to land, the −631 lines are real, and having the language semantics owned by lang-core is the right end state. But I ran the branch and probed @openuidev/lang-core@0.2.11 directly, and I found three problems I can't merge past, plus one smaller one. Two of them contradict claims in the PR description, so I've included the repro for each.

1. lang-core ships install-time and runtime telemetry into my published package (blocking)

@openuidev/lang-core runs a postinstall script that reports to PostHog, and — more importantly — Library.prompt() has runtime telemetry: at a 10% sample it sends a PostHog capture from the host process, and to build the project hash it executes git config --local --get remote.origin.url via child_process inside the consumer's server at runtime. @noetic-tools/openui is published on npm and auto-released on merge, so every downstream consumer inherits this with zero disclosure, and systemPrompt() is called on the hot path of every agent setup. See the inline comment on package.json for the specifics. I'm not shipping undisclosed third-party telemetry to my users — this needs to be off by default, or clearly surfaced and opt-outable at the Noetic level, before this can land.

2. "Validation is a strict superset of the old behavior" is not true — it's a large regression (blocking)

I ran this against the branch:

const doc = parseDocument('root = Card("ok")\nbad = Card(\norphan = Progress("not a number")\nlost = Bogus("x")');
doc.diagnostics            // []  (old: 'bad = Card(' was a diagnostic, kept OUT of the document)
validateDocument(lib, doc) // []  (old: caught the bad prop AND the unknown component)

Three distinct losses, detailed inline on library.ts and parser.ts:

• Malformed statements now enter doc.statements with zero diagnostics — and an unclosed bracket swallows every subsequent line of the turn into one garbage statement that streams to clients as an openui.node event and gets serialized into surface recall.
• Unknown components and invalid literal props on any statement not reachable from root are silent (lang-core reports nothing for orphans; collectPropIssues only walks parsed.root). The old validator walked every assignment.
• surface.ts validates the incoming turn's document, which on partial re-render turns has no root — so the guide-loop that tells the model to re-render is effectively dead for exactly the turns that need it. meta.incomplete / unresolved / orphaned from lang-core are all discarded.

The lang.test.ts change from 'bad = Card(' to 'bad' sidesteps precisely this — the old test input fails the new assertions.

3. systemPrompt() drops all $state/Query/Mutation/Action instruction — looks like an options-plumbing oversight (blocking, but easy)

I generated the prompt the branch actually produces: core.prompt() is called with no options, and lang-core's Query/Mutation/bindings/Action rules all sit behind prompt({ toolCalls, bindings, tools, ... }). The bare prompt teaches none of them — and it instructs the model to write root = Root(...), which lang-core's own parser then rejects (unknown-component: Root) because the bridge never passes root or defines one. It also says "generate realistic/plausible data", which fights the Query workflow, and @ToAssistant is never taught under any options even though ACTION_STEPS supports it. I assume you didn't intend to regress your own language here — the fix is plumbing real PromptOptions (and Noetic's interaction rules) through UiLibrary.systemPrompt(), which currently takes no arguments. Details inline on library.ts.

4. Unfrozen 0.x dependency + tests pinned to its prose (non-blocking but please fix)

^0.2.11 — 0.2.12 was published the same week, and this repo's convention is to freeze new dependency versions. Meanwhile the rewritten tests assert lang-core's exact prompt wording, so any wording tweak the caret pulls in breaks CI with no change in this repo. Inline on library.test.ts.

Happy to re-review quickly once these are addressed — 1 and 3 in particular look mechanical to fix, and for 2 I'd want either restored per-statement validation or an explicit, tested story for what the surface does with incomplete/orphaned/unknown statements.

[mattapperson]

This dependency phones home, twice:

1. postinstall (dist/postinstall.cjs): sends an openui_lang_core_installed event to PostHog with a salted SHA-256 of git remote origin, CI provider, Docker status, OS/node/package-manager metadata. Bun skips untrusted postinstalls locally, but @noetic-tools/openui is published to npm — npm/pnpm/yarn consumers run it transitively.
2. Runtime, in Library.prompt() — i.e. our systemPrompt(): recordSystemPromptGeneration fires at SAMPLE_RATE = 0.1, and getProjectHash runs execFile("git", ["config", "--local", "--get", "remote.origin.url"]) in the consumer's server process to hash the origin URL into the payload (component counts, CI status, runtime metadata included). Opt-out is OPENUI_TELEMETRY_DISABLED=1 / DO_NOT_TRACK=1, which nothing in this repo sets or documents.

I can't ship that silently to @noetic-tools/openui users. Before this lands I need one of: telemetry disabled by default upstream, a documented+enforced opt-out at the Noetic level (e.g. set the env var before any lang-core import, plus README/docs disclosure), or a telemetry-free build of lang-core.

Separately: please pin the exact version rather than ^0.2.11 — repo convention is to freeze new deps, and 0.x minors give no compat guarantees.

[Aditya-thesys]

Update on this: runtime telemetry in lang-core is now opt-in upstream (thesysdev/openui#991, merged yesterday). Library.prompt() sends nothing unless the consumer explicitly sets OPENUI_RUNTIME_TELEMETRY_ENABLED=1, and the existing disable flags still take precedence. So nothing runs in your users' server processes by default, including the git config lookup.

It has not shipped to npm yet (latest is 0.2.12, published before that change). When the next release lands I will bump the pin here so the PR carries the opt-in build.

The install-time postinstall event is still opt-out upstream. If that is acceptable with disclosure, I will add a short telemetry note to this package's README documenting it and the opt-out (OPENUI_TELEMETRY_DISABLED=1 or DO_NOT_TRACK=1) as part of this PR. If you want install-time off by default too, tell me and I will take that back upstream.

The exact-pin part is done on the branch (0.2.11, react-lang likewise in the example client).

[mattapperson]

Because acceptStatement no longer attempts an expression parse, anything shaped like ident = is accepted into the document verbatim. Concretely, on this branch:

root = Card("ok")
bad = Card(
orphan = Progress("not a number")

produces zero diagnostics, and the unclosed bracket makes the scanner swallow orphan = ... (and everything after it) into bad's source. That multi-line garbage statement then streams to clients as an openui.node event and is serialized into surface recall. The old pipeline turned this into a diagnostic and kept it out of the document.

If statement-level parse is out of scope now, this needs at least a cheap structural check (balanced brackets / lang-core parse of the single statement) before a statement is admitted, or meta.incomplete from lang-core needs to surface as a diagnostic at end().

[mattapperson]

The PR description says validation is a strict superset of the old behavior; it's a regression on three axes (all verified against this branch with lang-core 0.2.11):

1. Orphan statements are unvalidated. parsed.meta.errors is empty for statements not reachable from root — root = Card("ok") + lost = Bogus("x") returns zero issues (old code flagged every unknown component). And collectPropIssues only walks parsed.root, so bad literal props on unreachable statements are silent too.
2. Root-less documents validate as clean. surface.ts calls validateDocument(library, incoming) on the incoming turn, which on partial re-render turns often doesn't assign root — parsed.root is null, so the entire Zod prop check is skipped and the guide-loop never fires.
3. meta.incomplete, meta.unresolved, and meta.orphaned are discarded, so truncated output and dangling refs — which lang-core does detect — never reach diagnostics or guidance.

Also, isDynamic() tests 'k' in value by hand while this PR re-exports lang-core's isASTNode guard — a literal object prop that happens to contain a k key (e.g. {k: 1, label: "x"}, which materializes as a plain object) is wrongly skipped. Use isASTNode.

[mattapperson]

core.prompt() with no options produces a prompt that omits everything Noetic's surface depends on — I generated it and checked: no $state, no Query/Mutation, no Action/@Run/@Set, no @ToAssistant. All of that exists in lang-core's prompt but only behind prompt({ toolCalls: true, bindings: true, tools: [...] }), which is never passed — and can't be, since UiLibrary.systemPrompt() takes no arguments.

Worse, the bare prompt instructs root = Root(...) — and since the bridge passes neither a Root component nor createLibrary({ root }), lang-core's own parser rejects the very output the prompt demands (unknown-component: "Root" — verified). It also tells the model to "generate realistic/plausible data", which fights the Query workflow the old prompt taught.

I assume this is an options-plumbing oversight rather than intent. Fix I'd accept: thread real PromptOptions through systemPrompt() (tools/toolCalls/bindings/root), and add Noetic's interaction rules (@ToAssistant, no-prose/no-fences) via additionalRules/preamble so the model contract is at least as strong as before. The rewritten tests only assert two innocuous substrings, so please also add assertions that the $state/Query/Mutation/Action instructions actually survive.

[mattapperson]

Changing this fixture from 'bad = Card(' to 'bad' is what keeps this suite green — the original input now produces zero diagnostics and lands bad in doc.statements (with the following lines swallowed into its source). Please restore the original malformed-statement case and make it pass; the test edit is masking the regression rather than covering the new behavior.

[mattapperson]

These assertions pin the exact prose of a third-party 0.x package ('Component Signatures', 'Card(title: string, children?: any[])', 'Each statement is on its own line'). Combined with the ^0.2.11 range in package.json — 0.2.12 is already out — any upstream wording tweak breaks this repo's CI with no change here. Either pin the dependency exactly (my preference, per repo convention) or loosen these to structural assertions (component name + props present) that survive wording changes.