Table of Contents

About This Page

This page is a technical record of the skills, tools, and engineering practices represented in the npm TypeScript Package Template project.

Project Overview

The npm TypeScript Package Template is a starter repository for authoring and publishing TypeScript packages to npm. The project is maintained at blwatkins/npm-typescript-package-template and built with TypeScript and tsdown.

At a Glance

  • Project Type: Reusable project template / starter for npm packages
  • Primary Language: TypeScript
  • Primary Runtime: Node.js
  • Build Pipeline: tsdown
  • Quality Controls: ESLint, strict TypeScript compiler options
  • Automation: GitHub Actions
  • Dependency Automation: Dependabot
  • Security Analysis: CodeQL via GitHub Actions
  • Documentation Pattern: TypeDoc and Jekyll (GitHub Pages)

Skills and Tooling Inventory

Capability Record

  • Documentation completeness enforced as a build gate — treats undocumented and unresolvable API symbols as build failures rather than degraded output, so reference documentation cannot silently rot behind the code.
  • ESM package contract and artifact layout — maps every package resolution field to the exact artifacts the bundler emits, to improve resolution reliability for ESM consumers and TypeScript tooling.
  • Strict typing and layered lint enforcement — stacks type-aware, stylistic, and syntax-level rule sets over strict compiler settings to improve early detection of implementation defects.
  • Node.js compatibility contract across supported release lines — pins, declares, and continuously verifies the same runtime range, so the published compatibility claim is tested rather than asserted.
  • Type-checked test suite with coverage reporting — type-checks test sources in addition to executing them, catching type regressions that a runtime-only suite would pass over.
  • Security scanning and dependency update automation — runs scheduled code analysis and grouped dependency updates to improve baseline security and reduce dependency drift over time.
  • Dual-registry publishing with OIDC trusted publishing — gates release behind verification and authenticates to npm with a short-lived token, avoiding a long-lived publish credential in repository secrets.

Detailed Technical Notes

Each technical claim below is backed by a source link to the corresponding implementation or workflow configuration in the project repository.

Documentation completeness enforced as a build gate

TypeDoc is configured to treat warnings as errors and to validate undocumented symbols, non-exported references, and broken links, so a missing doc comment fails documentation generation instead of producing incomplete output. A dedicated JSDoc lint layer applies to source files on top of that, and the project’s validation script runs documentation generation alongside lint, build, and tests.

Evidence:

ESM package contract and artifact layout

The package is ESM-only, and the types, module, main, and exports fields all resolve to the .mjs bundle and .d.mts declaration file that tsdown emits for the esm output format. Build output is generated from a single entry point into _dist, and the published file list is limited to that directory plus package metadata.

Evidence:

Strict typing and layered lint enforcement

TypeScript is configured with the full strict family alongside unused-code, implicit-return, implicit-override, and index-signature access checks. Linting layers type-aware typescript-eslint strict and stylistic rule sets over an ES2022 syntax restriction, with a separate configuration covering plain JavaScript files in the repository.

Evidence:

Node.js compatibility contract across supported release lines

The supported Node.js range is declared in the package engines field and pinned for local development with a version file. Continuous integration runs the same checks against a matrix of those release lines, so the compatibility range the package advertises is the range that is actually exercised.

Evidence:

Type-checked test suite with coverage reporting

Vitest type-checks test files against a dedicated TypeScript configuration in addition to executing them, so a type regression in test code fails the suite. Coverage is collected through the V8 provider into a separate output directory, with generated build, documentation, and site output excluded from measurement.

Evidence:

Security scanning and dependency update automation

CodeQL analysis runs on pushes and pull requests to the release branches and on a recurring schedule, covering workflow definitions, JavaScript and TypeScript source, and the Ruby toolchain behind the documentation site. Dependabot maintains npm, GitHub Actions, and Bundler dependencies on a scheduled cadence, with version and security updates grouped separately to keep review batches small.

Evidence:

Dual-registry publishing with OIDC trusted publishing

The publish workflow gates release behind a full validation job — lint, documentation generation, build, and tests — then publishes the same package to both the npm registry and GitHub Packages. The npm job requests a short-lived OIDC token through id-token: write for trusted publishing rather than storing a long-lived registry token in repository secrets.

Evidence:

Current Gaps / Future Improvements

  • The template ships only an example HelloWorld module; real package logic is intentionally left to the consumer.
  • The test suite is a placeholder that exercises no assertions yet — Vitest, type checking, and coverage reporting are configured and running, but meaningful cases are left to the project built from this template.
  • Release documentation is organized manually and publishing is triggered by manual workflow dispatch, with no automated changelog or release-on-tag pipeline by design.

Back to top.