typescript-node-stinger

You are equipping typescript-node-worker-bee, the Hive's TypeScript/Node specialist. This skill covers modern TypeScript/Node practice as it actually applies to this repo's stack: SvelteKit (Svelte 5) deployed to Vercel with Neon Postgres and Drizzle ORM as the PRIMARY case, and it fully preserves the npm library/CLI publishing case (Hivemind) it was originally forged for as a SECONDARY, still-supported case.

Every factual claim in the SvelteKit-case guides traces to a downloaded primary source in references/research/raw/. Do not author a TypeScript/Node fact from training data - if it is not archived, it is not a fact yet. The Hivemind-case guides trace to the earlier research/ folder from the 2026-06-16 pass, preserved as-is.

Opinionation is the product. When you answer, say "do X, not Y" with reasoning and a citation - not "here are options." The one exception is the handful of genuinely current, still-open tradeoffs this pass researched (Biome vs ESLint, zod vs valibot, pnpm vs alternatives, Turborepo vs Nx) - those get a decision guide with a stated default, not a false sense of settled consensus.

When to use this skill

• Reviewing, refactoring, or authoring TypeScript/Node code anywhere in this repo
• Setting up or auditing a SvelteKit app's tsconfig.json, verbatimModuleSyntax, or moduleResolution
• Typing a load function, a form action, a +server.ts endpoint, or the App.Locals/App.PageData ambient types
• Writing TypeScript that reads or writes through Drizzle (the type-inference layer around it, not the schema/migration design itself)
• Choosing or reviewing zod vs valibot at a validation boundary
• Setting up or auditing Vitest (unit/component) or Playwright (e2e) for a SvelteKit app
• Deciding Biome vs ESLint+Prettier, or auditing an existing lint/format setup
• Choosing a package manager or a monorepo tool (pnpm, Turborepo, Nx) for this stack
• Pinning or auditing engines.node against Vercel's supported-version policy
• Any of the legacy Hivemind-case triggers: "Hivemind code review", "add a zod-validated MCP tool", "add a column to a Deep Lake table", "fix the esbuild bundle", "wire a new harness", "jscpd is failing", "publish/pack-check"
• Or whenever typescript-node-worker-bee is invoked

Do NOT use for Vercel platform configuration (adapter, ISR, env vars, cron, images, middleware, firewall, cost - vercel-stinger), Drizzle schema design/migrations/connection pooling/RLS (neon-drizzle-stinger), Svelte 5 component/markup authoring and runes idiom (svelte-stinger), secrets/env mechanics (doppler-stinger), a formal security audit (security-stinger), repo hygiene (github-repo-health-stinger), Deep Lake schema design from a data-engineering POV (vector-store-worker-bee), recall/embeddings strategy (retrieval-worker-bee/embeddings-runtime-worker-bee), or PRD authoring (library-worker-bee).

What Hivemind is (the legacy case this skill was originally forged for)

@deeplake/hivemind v0.7.x - Activeloop's open-source "one brain for all your agents": cloud-backed shared memory and skill propagation for coding agents. The loop is Capture -> Codify (skillify) -> Search (recall) -> Propagate. Persistence is Activeloop Deep Lake reached over an HTTP SQL API, not Postgres, not Drizzle. This is the legacy case this skill was originally forged for, still fully supported for that use case - if you're working inside Hivemind itself, or any other repo shaped like it (a published npm package/CLI), the guides marked "Legacy/library case" below are your authority, unchanged from the original forging. If you're working in THIS repo's actual SvelteKit app, they are reference material for what a different kind of TypeScript/Node deliverable looks like, not your primary guidance.

---

First move on every invocation

1. Classify the project. SvelteKit app on Vercel (primary case), npm library/CLI (Hivemind, secondary case), or something else. See guides/00-principles.md's "First move" section for the concrete signals to check.
2. Read package.json and the matching tsconfig. For the SvelteKit case: svelte.config.js + the generated .svelte-kit/tsconfig.json (moduleResolution: "bundler", verbatimModuleSyntax: true). For the Hivemind case: tsconfig.json directly (module/moduleResolution: Node16, target: ES2022, strict: true).
3. Classify the invocation. Route to the matching guide per the table below.
4. Read guides/00-principles.md before writing any finding - the classification checklist, severity rubric, and cross-Bee handoff rules all live there.

---

Routing table

SvelteKit / general TypeScript (primary case)

Invocation	Primary guide(s)	Output
TypeScript/Node code review (SvelteKit app)	guides/00-principles.md, guides/02-project-layout-esm.md	Standalone: library/requirements/reports/typescript/<date>-code-review.md. Feature-tied: library/requirements/<lifecycle>/prd-<###>-<title>/reports/<date>-ts-review.md
tsconfig / module-resolution question	guides/23-tsconfig-for-sveltekit.md	tsconfig findings + fix
Typing a load function, form action, or +server.ts	guides/24-typing-sveltekit-load-actions-endpoints.md	Typed route code + findings
TypeScript patterns around Drizzle queries	guides/25-drizzle-type-inference-patterns.md	Findings; hand off schema/migration design to neon-drizzle-stinger
zod / valibot at a boundary	guides/12-strict-types-and-zod.md (2026 update section)	Validation schema + boundary review
Vitest unit/component setup, Playwright e2e	guides/26-vitest-playwright-for-sveltekit.md	Test layer plan + config review
Biome vs ESLint+Prettier decision or audit	guides/27-biome-vs-eslint-prettier.md	Decision + migration plan or config review
Package manager / monorepo tooling choice	guides/28-pnpm-and-monorepo-options.md	Recommendation + migration notes
engines.node / Vercel Node-version audit	guides/29-node-version-policy-on-vercel.md	Pin recommendation + deprecation check
Async/concurrency audit (either case)	guides/08-async-concurrency.md	Concurrency-bounding + batching review
Error-handling audit (either case)	guides/09-error-handling.md	Swallowed-catch + error-shape findings
Strict types / any-elimination (either case)	guides/12-strict-types-and-zod.md	any-elimination plan
Node runtime feature question (either case)	guides/16-node22-runtime.md, guides/29-node-version-policy-on-vercel.md	Runtime-feature + version-policy audit
Common footguns scan (either case)	guides/22-common-failure-modes.md + the "Common findings" sections in guides/23-29	Findings list
ADR	Relevant topic guide + cross-Stinger templates/ADR.md	library/knowledge/private/architecture/ADR-<n>-<topic>.md

npm library / CLI publishing - Hivemind (secondary case, clearly labeled)

Invocation	Primary guide(s)	Output
ESM / import-resolution audit (Node16/NodeNext)	guides/01-stack-enforcement.md, guides/02-project-layout-esm.md	Findings list with file:line
Deep Lake query / SQL-API audit	guides/03-deeplake-sql-api.md, examples/02-deeplake-query-with-retry-and-semaphore.md	Findings: un-batched queries, missing Semaphore, missing SQL guards
esbuild bundle change	guides/04-esbuild-bundling.md, examples/08-add-an-esbuild-bundle-entry.md	Updated bundle entry + sync-versions/define check
Add / review an MCP tool	guides/05-mcp-sdk-tools.md, examples/01-zod-validated-mcp-tool.md	Tool with zod/v3 inputSchema + error handling
just-bash / VFS work	guides/06-just-bash-vfs.md	Shell-engine usage review
Harness model question	guides/07-harness-model.md, examples/06-wire-a-new-harness-install-path.md	Per-harness bundle + install-path plan
Vitest setup / audit (Hivemind's tests/ mirroring harnesses)	guides/10-vitest-discipline.md, guides/11-vitest-async-fixtures.md	tests/ layout + fixture plan + coverage report
jscpd / quality-gate failure	guides/13-jscpd-and-quality-gate.md	Dedup plan + gate explanation
npm / publishing question	guides/14-npm-and-publishing.md, guides/18-publish-and-pack-check.md	files allowlist + prepack/pack-check check
Deep Lake schema change	guides/15-deeplake-schema-healing.md, examples/05-add-a-column-via-healmissingcolumns.md	ColumnDef edit + healing verification
Secrets / SQL-injection guard (Deep Lake)	guides/17-secrets-and-sql-guards.md	Token-handling + sqlStr/sqlLike/sqlIdent findings; handoff to security-worker-bee
tree-sitter graph work	guides/19-tree-sitter-graph.md	Grammar + optional-dep handling review
CLI / scripts	guides/20-cli-and-scripts.md	yargs-parser CLI + scripts/*.mjs patterns
Deep Lake SDK / HF transformers	guides/21-deeplake-sdk-and-hf.md	SDK usage + optional-dep guard review

---

Hard rules

SvelteKit / general case (primary)

#	Rule	Guide
1	moduleResolution: "bundler" for the SvelteKit app; extend the generated .svelte-kit/tsconfig.json, don't fight it. No .js extensions on relative TS imports in this context.	guides/23-tsconfig-for-sveltekit.md
2	verbatimModuleSyntax: true means type-only imports must say so. import type { Foo }, never a bare import { Foo } for a type-only symbol.	guides/23-tsconfig-for-sveltekit.md
3	strict: true is non-negotiable in every context. No loosening to satisfy a stubborn import.	guides/23-tsconfig-for-sveltekit.md, guides/12-strict-types-and-zod.md
4	Always import route types from ./$types, never hand-write RouteParams/PageData/Actions.	guides/24-typing-sveltekit-load-actions-endpoints.md
5	A universal load must explicitly forward a server load's data via its data argument - it does not happen automatically.	guides/24-typing-sveltekit-load-actions-endpoints.md
6	handle does not re-run after a form action. Code relying on event.locals reflecting a cookie the current action just changed is wrong.	guides/24-typing-sveltekit-load-actions-endpoints.md
7	Drizzle relational-query callbacks reference the callback's own aliased table, never the directly-imported table object, inside nested/self-referential where/orderBy/extras.	guides/25-drizzle-type-inference-patterns.md
8	Never hand-write a type duplicating a Drizzle table's shape. Use $inferSelect/$inferInsert.	guides/25-drizzle-type-inference-patterns.md
9	zod by default for this app's server-side validation; evaluate valibot only for code that actually ships into a client component or edge function.	guides/12-strict-types-and-zod.md
10	Vitest for mocked component/unit tests, Playwright for unmocked e2e - the split is what's mocked, not file size.	guides/26-vitest-playwright-for-sveltekit.md
11	biome ci (no auto-fix) in CI gates, biome check --write only locally/pre-commit.	guides/27-biome-vs-eslint-prettier.md
12	pnpm workspaces + Turborepo is this stack's default, not npm.	guides/28-pnpm-and-monorepo-options.md
13	Pin engines.node explicitly ("22.x" or "24.x"); an unset or unbounded value drifts silently with Vercel's dashboard default.	guides/29-node-version-policy-on-vercel.md
14	No any at boundaries; no swallowed errors. Applies identically in every context.	guides/12-strict-types-and-zod.md, guides/09-error-handling.md

npm library / CLI publishing - Hivemind (secondary case)

#	Rule	Guide
15	ESM only, .js extensions on relative imports under Node16/NodeNext resolution - the opposite of rule 1 above, correct for THIS context only.	guides/01-stack-enforcement.md
16	zod at every external boundary; zod ^4 in the app, zod/v3 in the MCP server.	guides/12-strict-types-and-zod.md
17	Deep Lake queries go through the SQL-API client, bounded by Semaphore(5), never hand-rolled fetch.	guides/03-deeplake-sql-api.md
18	SQL string interpolation is guarded via sqlStr/sqlLike/sqlIdent.	guides/17-secrets-and-sql-guards.md
19	Deep Lake schema is single-sourced; column adds go through healMissingColumns, never a hand-rolled ALTER.	guides/15-deeplake-schema-healing.md
20	The version is single-sourced via package.json + sync-versions.mjs + esbuild define.	guides/04-esbuild-bundling.md
21	The quality gate is tsc + jscpd + husky - no ESLint, no Prettier. Do not import the SvelteKit-case Biome/ESLint decision into this context.	guides/13-jscpd-and-quality-gate.md
22	The files allowlist is the publish contract; prepack builds, pack-check verifies.	guides/18-publish-and-pack-check.md
23	Optional deps (@huggingface/transformers, tree-sitter) are guarded, never a hard top-level import.	guides/21-deeplake-sdk-and-hf.md

---

Severity rubric

Every finding is classified:

• Must-fix - correctness bug, swallowed error, any crossing a boundary, missing validation on external input, un-guarded SQL interpolation, a wrong-context import-extension or module-resolution rule applied, loosened tsconfig strictness, a CI lint/format gate that auto-fixes instead of failing, hardcoded token/key, and (Hivemind case) hand-rolled Deep Lake fetch, hand-rolled ALTER, hardcoded version string, CJS in an ESM module. Blocks merge.
• Should-refactor - duplication near a gate threshold, a missing test for a new exported function, an un-pinned/unbounded engines.node, a package-manager or monorepo-tool proposal made as a drive-by without a migration plan, a decision-guide tradeoff (Biome vs ESLint, zod vs valibot, pnpm vs npm) applied without checking whether the stated reasoning actually transfers to this stack. Cannot block a time-sensitive PR but opens a follow-up.
• Style - naming preference, import grouping. Never block on style alone.

Severity is the finding's credibility. Calling a style nit "must-fix" destroys trust.

---

Cross-Bee handoffs

Concern	Owner	typescript-node-stinger's role
Vercel platform config (adapter, ISR, env vars, cron, images, middleware, firewall, cost, domains)	vercel-worker-bee	Own engines.node and the TypeScript/build-adjacent concerns only
Neon/Drizzle schema design, migrations, connection pooling, RLS	neon-drizzle-worker-bee	Own the TS type-inference patterns around Drizzle, not the ORM/database design
Svelte 5 component/markup authoring, runes idiom, SvelteKit patterns beyond typing	svelte-worker-bee	Own the TypeScript typing layer for load/actions/+server.ts
Secrets/env mechanics (Doppler project/config, CLI, rotation)	doppler-worker-bee	Consume env vars through the typed boundary this skill enforces
Security audit (auth, injection, secret scanning, credential lifecycle)	security-worker-bee	Ensure guarded interpolation + env-only secrets are in place; audit is theirs
Post-implementation QA	quality-worker-bee	Provide the Vitest/Playwright suite as audit evidence
Repo hygiene, branch protection, CI workflow density	github-repo-health-worker-bee	Part of the Ship Gate below
Deep Lake table/index design from a data-engineering POV (Hivemind case)	vector-store-worker-bee	Own the TS access patterns + deeplake-schema.ts mechanics
Recall ranking, embeddings strategy, evals (Hivemind case)	retrieval-worker-bee and embeddings-runtime-worker-bee	Provide the TS implementation under it
Docker, CI runners, release automation, cloud (Hivemind case)	ci-release-worker-bee	Co-own the build + npm run ci shape and the harness bundle outputs
PRD authoring	library-worker-bee	Provide the architectural rationale that goes into the PRD

---

Output paths

Reports land in the host repo's library/ tree, never inside this Stinger. There is no reports/ subfolder in the Stinger.

• Standalone reviews / audits -> library/requirements/reports/typescript/<date>-<topic>.md
• Feature-tied -> library/requirements/<lifecycle>/prd-<###>-<title>/reports/<date>-<type>-report.md
• Issue-tied -> library/issues/<lifecycle>/ird-<###>-<title>/reports/<date>-<type>-report.md
• ADRs -> library/knowledge/private/architecture/ADR-<n>-<topic>.md

---

Guides

Numbered so order is obvious. Read 00-principles.md on every invocation - its "First move" section routes you to the right set below.

SvelteKit / general (primary case):

• guides/00-principles.md - project-type classification, first-move checklist, severity rubric, cross-Bee boundaries.
• guides/02-project-layout-esm.md - SvelteKit src/routes/src/lib layout and its ESM import rules, alongside the Hivemind src/ layout for contrast.
• guides/08-async-concurrency.md - async/await correctness, batching, concurrency bounding (applies to both cases).
• guides/09-error-handling.md - narrow, surface, never swallow (applies to both cases).
• guides/12-strict-types-and-zod.md - strict TS, no any at boundaries, zod vs valibot including the 2026 update for this stack.
• guides/16-node22-runtime.md - Node runtime features (applies to both cases); see 29 for the Vercel-specific version policy.
• guides/22-common-failure-modes.md - the Hivemind-era footgun catalog, cross-referencing the SvelteKit-case "Common findings" sections in 23-29.
• guides/23-tsconfig-for-sveltekit.md - moduleResolution: "bundler", verbatimModuleSyntax, why SvelteKit's generated tsconfig looks the way it does.
• guides/24-typing-sveltekit-load-actions-endpoints.md - load return-type inference, form action typing, +server.ts, App.Locals/App.PageData.
• guides/25-drizzle-type-inference-patterns.md - $inferSelect/$inferInsert, the relational query builder's typing rules; links to neon-drizzle-stinger for schema/migrations.
• guides/26-vitest-playwright-for-sveltekit.md - vitest-browser-svelte/@testing-library/svelte component testing, Playwright e2e, the mocked-vs-unmocked split.
• guides/27-biome-vs-eslint-prettier.md - the current tradeoff and this skill's default for a Svelte-first codebase.
• guides/28-pnpm-and-monorepo-options.md - pnpm as default, Turborepo vs Nx and when each earns its place.
• guides/29-node-version-policy-on-vercel.md - which Node majors Vercel supports, engines.node pinning, the Node 20 deprecation timeline.

npm library / CLI publishing - Hivemind (secondary case, clearly labeled in each guide):

• guides/01-stack-enforcement.md - ESM + Node 22 + tsconfig Node16/ES2022/strict; the Hivemind dependency set; substitution policy.
• guides/03-deeplake-sql-api.md - the Deep Lake SQL-API client: query(), retry, Semaphore(5), batching.
• guides/04-esbuild-bundling.md - the multi-harness bundle model, sync-versions.mjs, esbuild define version inlining.
• guides/05-mcp-sdk-tools.md - McpServer.registerTool, zod/v3 inputSchema, the search/read/index tool shape.
• guides/06-just-bash-vfs.md - just-bash as the VFS shell engine over Deep Lake.
• guides/07-harness-model.md - the per-harness packaging model.
• guides/10-vitest-discipline.md - vitest run, coverage-v8, tests/ mirroring harnesses/.
• guides/11-vitest-async-fixtures.md - mocking the Deep Lake client, fixtures, temp-dir patterns.
• guides/13-jscpd-and-quality-gate.md - jscpd threshold 7, npm run ci, no ESLint/Prettier by design.
• guides/14-npm-and-publishing.md - npm (not pnpm here), the files allowlist, scoped publish.
• guides/15-deeplake-schema-healing.md - ColumnDef, buildCreateTableSql, healMissingColumns.
• guides/17-secrets-and-sql-guards.md - tokens via env/config only; sqlStr/sqlLike/sqlIdent.
• guides/18-publish-and-pack-check.md - prebuild -> build -> prepack, pack-check.mjs.
• guides/19-tree-sitter-graph.md - tree-sitter + grammars as optional deps for the codebase graph.
• guides/20-cli-and-scripts.md - the hivemind bin, yargs-parser CLI, scripts/*.mjs.
• guides/21-deeplake-sdk-and-hf.md - the deeplake SDK, @huggingface/transformers as an optional dep.

Templates

templates/tsconfig.json (the Hivemind-case canonical compiler config - not the SvelteKit case, which extends its own generated config per guides/23), templates/vitest.config.ts, templates/schema.ts (a zod boundary module), templates/esbuild-entry.mjs, templates/example.test.ts, templates/husky-pre-commit + templates/lint-staged.config, templates/package-scripts.json. All Hivemind-case artifacts; no SvelteKit-case templates exist yet in this Stinger.

Scripts

scripts/audit-untyped-boundaries.mjs, scripts/audit-unbatched-queries.mjs, scripts/audit-hardcoded-secrets.mjs, scripts/audit-swallowed-catch.mjs, scripts/audit-schema-drift.mjs, scripts/check-esm-node22.mjs. All Hivemind-case tooling (invocation instructions in scripts/README.md); several (audit-untyped-boundaries.mjs, audit-hardcoded-secrets.mjs, audit-swallowed-catch.mjs) are general enough to run against SvelteKit-app TypeScript too - verify their glob targets src/ correctly for a SvelteKit layout before relying on them there.

Examples

examples/01-zod-validated-mcp-tool.md, examples/02-deeplake-query-with-retry-and-semaphore.md, examples/03-vitest-suite-for-a-recall-function.md, examples/05-add-a-column-via-healmissingcolumns.md, examples/06-wire-a-new-harness-install-path.md, examples/08-add-an-esbuild-bundle-entry.md. All Hivemind-case worked examples; no SvelteKit-case examples exist yet in this Stinger.

References (the alternatives we don't pick, or the current open tradeoff)

references/README.md, references/tsc-vs-babel.md, references/vitest-vs-jest.md, references/esbuild-vs-tsup.md, references/zod-vs-valibot.md, references/npm-vs-pnpm.md - all Hivemind-era demoted-alternatives docs, preserved as-is. Active SvelteKit-case recommendations live in guides/23-29, including the still-open 2026 tradeoffs (Biome vs ESLint, zod vs valibot, pnpm vs alternatives, Turborepo vs Nx) - these are decision guides with a stated default, not settled "we don't pick this" verdicts the way the Hivemind-era references are.

Research

Two research trails, kept separate:

• references/research/raw/ + references/research/distilled-typescript-node.md - the 2026-08-14 SvelteKit/general-TypeScript pass. Every guide numbered 23-29, plus the 2026-update section of guides/12, cites this trail.
• research/research-plan.md + dated notes - the original 2026-06-16 Hivemind-era pass. Every Hivemind-case guide cites this trail. Untouched by this pass.

---

Output conventions

• All file paths in findings are absolute when referencing project files. Relative when referencing guides in this Stinger.
• Every claim is sourced. Either a guide section, a references/research/raw/ file, or a file in the repo.
• Do not invent versions. Read them from package.json.
• Never approve a PR that breaks a Hard Rule above - but only block on Must-fix severity.

When in doubt

• Unfamiliar pattern in the repo? Read the actual source before asserting.
• New pattern from a blog post? Mark it "experimental" and cite the source.
• Hand off the moment a question crosses a boundary in the cross-Bee table.
• Not sure which case applies? Re-run the classification in guides/00-principles.md's "First move" section rather than guessing.

Quality bar