v1 prep

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22, 24]
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - run: npm ci
+      - run: npm run build
+      - run: npm run lint
+      - run: npm run typecheck
+      - run: npm test
+
+  integration:
+    # Only run on push to main/develop, not on PRs (avoids leaking the
+    # live API key to forked-PR runners and keeps PR CI fast).
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          cache: npm
+
+      - run: npm ci
+      - run: npm run build
+      - name: Run e2e tests against live API
+        env:
+          OMOPHUB_API_KEY: ${{ secrets.TEST_API_KEY }}
+        run: npm run test:e2e

.github/workflows/publish.yml

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+name: Publish to npm
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          registry-url: https://registry.npmjs.org
+          cache: npm
+
+      - run: npm ci
+      - run: npm run build
+      - run: npm test
+      - run: npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.gitignore

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+node_modules/
+dist/
+coverage/
+.env
+.env.local
+.env.*.local
+*.log
+npm-debug.log*
+.DS_Store
+.idea/
+.vscode/
+*.swp
+*.swo

.nvmrc

@@ -0,0 +1 @@
+22

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.0.0] - 2026-05-31
+
+### Added
+
+- Initial scaffolding: `OMOPHub` client skeleton with API key + base URL resolution, env-var precedence, and constructor-time validation.
+- TypeScript build (ES2022, NodeNext, strict mode).
+- Biome v2 lint + format.
+- Vitest test runner with v8 coverage and a 90% statements threshold.
+- CI workflow on Node 22 and 24 (`build`, `lint`, `typecheck`, `test`).
+- npm publish workflow triggered by GitHub release, with provenance attestation.
+- HTTP layer: `get` / `post` / `patch` / `put` / `delete` methods on `OMOPHub` with retry on 429 + 502/503/504 + network errors. Full-jitter exponential backoff (500ms → 8s), `Retry-After` honoured up to 60s.
+- Discriminated `Response<T> = { data, error, meta, headers }` return type - errors never throw from network paths.
+- 16-code `OMOPHUB_ERROR_CODE_KEY` union with stable codes mapped from HTTP status + server-provided error codes.
+- `OMOPHubError` (thrown only on constructor misuse) and `OMOPHubIteratorError` (thrown from future async iterators).
+- Common request-option interfaces: `PerCallOptions`, `GetOptions`, `PostOptions` (with `idempotencyKey`), `PatchOptions`, `PutOptions`, `DeleteOptions`.
+- Pagination types: `PaginationOptions`, `PaginationMeta`, `PaginatedData<T>`.
+- Vocab-release mixin + utility types (`RequireAtLeastOne`, `RequireExactlyOne`).
+- Query builder: camelCase → snake_case, array → comma-join, null/undefined dropped.
+- Envelope unwrap: tolerates both `{ success, data, meta }` and raw payload bodies.
+- AbortSignal composition: client timeout + caller signal merged via `AbortSignal.any`; caller aborts propagate as thrown `AbortError`, timeouts return `timeout_error`.
+- `X-Vocab-Version` header injection when `vocabVersion` option is set.
+- First resource: `client.vocabularies.list()` with snake_case query serialisation, pagination, and error mapping.
+- Test fixtures (`DIABETES_CONCEPT_ID` etc.) and mock-fetch helpers for `vi.fn`-based testing without external mock libraries.
+
+### Added (resources)
+
+- `client.concepts` - 7 methods: `get`, `getByCode`, `batch`, `suggest`, `related`, `relationships`, `recommended`. `concepts.get(0)` accepts the OMOP unmapped sentinel (R-SDK bug fix). `batch` validates 1–100 IDs synthetically; `recommended` validates `conceptIds` ≤ 100, `relationshipTypes` ≤ 20, `vocabularyIds`/`domainIds` ≤ 50.
+- `client.vocabularies` extended with 6 methods: `get`, `stats`, `domainStats`, `domains` (vocab-scoped), `conceptClasses`, `concepts`.
+- `client.domains` - 2 methods: `list`, `concepts`.
+- `client.search` - 11 methods: `basic`, `basicIter`, `basicAll`, `advanced`, `autocomplete`, `semantic`, `semanticIter`, `semanticAll`, `bulkBasic`, `bulkSemantic`, `similar`. `bulkBasic` validates 1–50 searches; `bulkSemantic` validates 1–25; `similar` enforces XOR of `conceptId`/`conceptName`/`query` both at the TS type level (discriminated union) and at runtime.
+- `client.hierarchy` - 3 methods: `get` (flat or graph format), `ancestors`, `descendants`. Server caps `maxLevels` at 20.
+- `client.relationships` - 2 methods: `get` (shares wire endpoint with `concepts.relationships` - kept as parallel discoverable surface), `types`.
+- `client.mappings` - 2 methods: `get` and `map`. `map` enforces XOR of `sourceConcepts` vs `sourceCodes` at both type and runtime levels. `vocabRelease` is routed to the `?vocab_release=` query parameter rather than the JSON body (matches Python SDK convention). JSDoc documents the Procedure-domain vocabulary priority chain (SNOMED → LOINC → CPT4 → HCPCS → ICD10PCS → ICD9Proc → OPCS4 → OMOP Extension).
+- `ConceptHierarchyNode` extended with `domain_id`, `concept_class_id`, `standard_concept` optional fields - now matches Python's `HierarchyConcept` and is re-exported as `HierarchyConcept`/`Ancestor`/`Descendant` from the hierarchy module.
+- `ConceptRelationship` re-exported as `Relationship` from the relationships module - kept in sync via type alias.
+- `client.fhir` - 3 methods: `resolve` (accepts both flat `{ system, code }` and nested `{ coding: {...} }` forms, mirroring the Python SDK's `_extract_coding`), `resolveBatch` (1–100 codings), `resolveCodeableConcept` (1–20 codings). All three validate synthetically before issuing requests.
+- Standalone helpers (no client required):
+  - `omophubFhirUrl(version)` - returns the URL of OMOPHub's hosted FHIR Terminology Service (`'r4'` default, also `'r4b'`, `'r5'`, `'r6'`).
+  - `getApiKey()`, `setApiKey(key)`, `hasApiKey()` - env-backed helpers reading `OMOPHUB_API_KEY` from `process.env`. `setApiKey` throws `OMOPHubError` on edge runtimes that lack a writable `process.env`.
+- FHIR `Coding` type uses camelCase (`userSelected`, `vocabularyId`) to match the FHIR JSON spec - converted to snake_case at the wire via `toSnakeCaseKeys`.
+- README polish: install + config table + per-resource usage examples for all 8 resources + error-handling guide + async-iterator guide + Python/R migration table.
+
+### SDK surface at v1.0.0 - 37 methods across 8 resources
+
+```
+client.concepts      - get, getByCode, batch, suggest, related, relationships, recommended   (7)
+client.search        - basic, basicIter, basicAll, advanced, autocomplete, semantic,
+                       semanticIter, semanticAll, bulkBasic, bulkSemantic, similar           (11)
+client.vocabularies  - list, get, stats, domainStats, domains, conceptClasses, concepts      (7)
+client.domains       - list, concepts                                                        (2)
+client.hierarchy     - get, ancestors, descendants                                           (3)
+client.relationships - get, types                                                            (2)
+client.mappings      - get, map                                                              (2)
+client.fhir          - resolve, resolveBatch, resolveCodeableConcept                         (3)
+                                                                                          Σ = 37
+
+Standalone: omophubFhirUrl, getApiKey, setApiKey, hasApiKey
+```
+
+<!-- Reference-style version links. Update when the v1.0.0 tag is cut. -->
+[Unreleased]: https://github.com/OMOPHub/omophub-node/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/OMOPHub/omophub-node/releases/tag/v1.0.0
+

CONTRIBUTING.md

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+# Contributing to OMOPHub Node.js SDK
+
+First off, thank you for considering contributing to OMOPHub!
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+Before creating bug reports, please check the [existing issues](https://github.com/OMOPHub/omophub-node/issues) to avoid duplicates.
+
+When creating a bug report, please include:
+
+- **Node version** (`node --version`)
+- **Package manager + version** (`npm --version` / `pnpm --version` / `bun --version`)
+- **SDK version** (`npm ls @omophub/omophub-node`)
+- **Runtime** (Node, Deno, Bun, Cloudflare Workers, Vercel Edge, browser)
+- **Operating system**
+- **Minimal code example** that reproduces the issue
+- **Full error output** - `error.name`, `error.statusCode`, `error.message`, and `error.requestId` if available
+- **Expected vs actual behavior**
+
+If you're seeing a transport-level failure, include the response headers - especially `x-request-id` - so we can correlate against server logs.
+
+### Suggesting Features
+
+Feature requests are welcome! Please open an issue with:
+
+- Clear description of the feature
+- Use case: why would this be useful?
+- Proposed TypeScript surface (option keys, return shape)
+- Possible implementation approach (optional)
+
+### Pull Requests
+
+1. **Fork the repository** and create your branch from `main`
+2. **Install dependencies:**
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/omophub-node.git
+   cd omophub-node
+   npm install
+   ```
+3. **Make your changes** with clear, descriptive commits
+4. **Add tests** for new functionality - both unit tests (`test/`) and, when the change touches the wire, integration tests (`e2e/`)
+5. **Run the full validation suite:**
+   ```bash
+   npm run typecheck
+   npm run lint
+   npm test
+   npm run build
+   ```
+6. **Run integration tests** if your change affects request/response shapes:
+   ```bash
+   OMOPHUB_API_KEY=oh_xxx npm run test:e2e
+   ```
+7. **Update documentation** - `README.md`, `CHANGELOG.md` under `## [Unreleased]`, and any relevant JSDoc
+8. **Submit a pull request** with a clear description
+
+## Development Setup
+
+### Prerequisites
+
+- **Node.js 22+** (see `.nvmrc`)
+- **npm 10+** (ships with Node 22)
+
+### Installation
+
+```bash
+# Clone your fork
+git clone https://github.com/YOUR_USERNAME/omophub-node.git
+cd omophub-node
+
+# Use the pinned Node version
+nvm use   # or `fnm use`
+
+# Install dependencies
+npm install
+```
+
+For integration tests against the live API, create a `.env` file at the repo root:
+
+```bash
+echo "export OMOPHUB_API_KEY=oh_xxx" > .env
+```
+
+`.env` is gitignored - never commit your key.
+
+### Running Tests
+
+```bash
+# Unit tests (fast, fully mocked - no network)
+npm test
+
+# Watch mode for active development
+npm run test:watch
+
+# With coverage report
+npm run test:coverage
+
+# Integration tests against the live API (requires OMOPHUB_API_KEY)
+set -a && source .env && set +a
+npm run test:e2e
+
+# Run a single test file
+npx vitest run test/concepts/concepts.test.ts
+
+# Run tests matching a pattern
+npx vitest run -t "bulk"
+```
+
+Unit tests live in `test/` and use `vitest` with `vi.fn()`-based mock fetches - no external mock libraries. Integration tests live in `e2e/` and exercise the SDK against `api.omophub.com/v1`; they tolerate rate limits and known slow paths via the helpers in `e2e/_helpers.ts`.
+
+### Code Style
+
+We use:
+
+- **Biome v2** for linting and formatting
+- **TypeScript strict mode** (no `any`, no implicit returns, no unused locals)
+
+```bash
+# Check lint + format
+npm run lint
+
+# Auto-fix lint + format
+npm run lint:fix
+
+# Format only
+npm run format
+
+# Type-check (src + e2e)
+npm run typecheck
+```
+
+Run `npm run lint:fix && npm run typecheck` before pushing. CI runs the same checks.
+
+### Running Examples
+
+The `examples/` directory contains runnable scripts you can use to smoke-test your changes end-to-end:
+
+```bash
+set -a && source .env && set +a
+npx tsx examples/basic-usage.ts
+npx tsx examples/fhir-resolver.ts
+```
+
+If your change affects a public method, add or update an example.
+
+## Project Structure
+
+```
+omophub-node/
+├── src/
+│   ├── index.ts              # Public API exports
+│   ├── client.ts             # OMOPHub client + HTTP dispatch + retry
+│   ├── errors.ts             # OMOPHubError, OMOPHubIteratorError, error codes
+│   ├── version.ts            # SDK version (auto-bumped)
+│   ├── interfaces.ts         # Shared request/response/option types
+│   ├── auth/                 # API key env helpers
+│   ├── common/               # syntheticError, pagination, toSnakeCaseKeys, …
+│   ├── concepts/
+│   │   ├── concepts.ts       # Concepts resource methods
+│   │   └── interfaces/       # Per-method option + response types
+│   ├── search/
+│   ├── hierarchy/
+│   ├── relationships/
+│   ├── mappings/
+│   ├── vocabularies/
+│   ├── domains/
+│   └── fhir/
+├── test/                     # Unit tests (mock-fetch, no network)
+├── e2e/                      # Integration tests (live api.omophub.com)
+├── examples/                 # Runnable example scripts
+├── package.json
+├── tsconfig.json             # src build config
+├── tsconfig.e2e.json         # e2e typecheck config
+├── tsconfig.examples.json    # examples typecheck config
+├── biome.json                # Lint + format rules
+├── vitest.config.ts          # Unit test runner
+└── vitest.e2e.config.ts      # Integration test runner (fileParallelism: false)
+```
+
+## SDK Conventions
+
+A few patterns are load-bearing - please follow them when adding new methods:
+
+- **Discriminated returns, not exceptions.** Every method returns `Promise<{ data, error, meta, headers }>`. The only exceptions the SDK throws are `OMOPHubError` (constructor misuse) and `OMOPHubIteratorError` (`*Iter` async-generator page failures). Network errors, 404s, 429s, validation failures - all returned as `error` values.
+- **camelCase TypeScript surface, snake_case wire.** Request options take camelCase keys (`vocabularyIds`, `pageSize`); they're converted to snake_case at the request boundary via `toSnakeCaseKeys`. Response types use snake_case to match the wire - never client-translated.
+- **Synthetic validation when feasible.** Reject obviously-bad inputs (empty arrays, out-of-range counts, missing required fields) with `syntheticError(...)` before making a network call. Match the wire-shape of a real server error so callers' error-handling code doesn't have to branch.
+- **Positional path args + merged options.** Prefer `client.concepts.get(201826, { includeRelationships: true })` over `({ conceptId: 201826, ... })`. Path params are positional; everything else goes in a single options object.
+- **Idempotency-key retries.** GET/HEAD/OPTIONS/PUT/DELETE retry automatically on transient failures. POST/PATCH only retry when the caller sets `{ idempotencyKey: '...' }` - never silently retry a non-idempotent write.
+- **Pagination metadata on the outer envelope.** `meta.pagination` lives on the response, never inside `data`. Add `*Iter` (async generator) and `*All` (eager collector with error accumulation) variants for any new paginated resource.
+
+When the live API returns a shape that doesn't match the existing types, **fix the type to match the wire** - don't transform on the response path. Log the discovery in `CHANGELOG.md` so the wire-drift history stays traceable.
+
+## Commit Messages
+
+We follow [Conventional Commits](https://www.conventionalcommits.org/):
+
+- `feat:` New feature
+- `fix:` Bug fix
+- `docs:` Documentation changes
+- `test:` Adding or updating tests
+- `refactor:` Code refactoring
+- `chore:` Maintenance tasks
+
+Examples:
+```
+feat: add semantic search endpoint
+fix: handle rate limit errors correctly
+docs: update README with new examples
+test: add integration tests for batch concept lookup
+```
+
+## Release Process
+
+Releases are cut by maintainers via GitHub Releases - **do not bump the version in `package.json` in your PR**. The publish workflow (`.github/workflows/publish.yml`) runs on release-published, publishes to npm with provenance attestation, and tags the registry version.
+
+For each PR, add a bullet under `## [Unreleased]` in `CHANGELOG.md` describing the user-visible change.
+
+## Questions?
+
+- Open a [GitHub Discussion](https://github.com/OMOPHub/omophub-node/discussions)
+- Email: support@omophub.com
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.
+
+---
+
+Thank you for helping make OMOPHub better!