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dobroslavradosavljevic/skills

tsdown

Build, review, debug, configure, migrate, teach, or plan tsdown library bundling with current docs and a full usage guide.

First seen Jul 30, 2026

Installation

$ npx skills add dobroslavradosavljevic/skills --skill tsdown
View on skills.sh ↗ GitHub repository ↗

Summary

  • Build, review, debug, configure, migrate, teach, or plan tsdown library bundling with current docs and a full usage guide.
  • Use for tsdown, tsdown.config, defineConfig, entry, format esm/cjs, dts, deps.neverBundle/alwaysBundle, exports, unbundle, watch, minify, target, platform, copy, CSS (@tsdown/css), plugins, workspace, programmatic build(), and tsup to tsdown migration.

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More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
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Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 1
License LICENSE
Default branch main
Open issues 0
Status Active

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 3,570 B
  • docs SUMMARY.md 389 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 31 installs

SKILL.md

tsdown

Use this skill when work touches tsdown: library builds, tsdown.config, dts/exports, dependency externalization, watch/unbundle, CSS/plugins/workspace, or migrating from tsup.

Workflow

  1. Inspect the local tsdown surface:

- Package version ([email protected] preferred; snapshot 0.22.14). Node to run the tool: ^22.18.0 || >=24.11.0. - Config: tsdown.config.ts / package.json#tsdown; peers (typescript, @tsdown/css, publint, …). - package.json type, exports, types, engines.node (feeds target/dts auto-detect). - Whether migrating from tsup (external, entryPoints, bundle: false, …).

  1. For day-to-day how-to, follow [usage-guide.md](references/usage-guide.md) first.
  2. Refresh docs when versions drift (especially 0.23 beta). Start from [source-map.md](references/source-map.md).
  3. Route deeper detail:

- Config/CLI/defaults: [config-cli.md](references/config-cli.md). - dts, package exports, deps: [dts-exports-deps.md](references/dts-exports-deps.md). - Plugins, CSS, copy, workspace, programmatic: [plugins-css-workspace.md](references/plugins-css-workspace.md). - tsup migration: [migrate-from-tsup.md](references/migrate-from-tsup.md).

  1. Prefer current APIs: entry, deps.neverBundle / alwaysBundle, unbundle, copy, cjsDefault. Treat CJS as maintenance; prefer ESM-only for new libraries.
  2. Verify with bunx tsdown (or project build), check dist + exports/types, then consume the package from a smoke import.

Core Judgment

  • tsdown = library bundler on Rolldown + Oxc — spiritual successor to tsup, not an app bundler.
  • Defaults differ from tsup: format: 'esm', clean: true, dts often auto from package.json types/exports, target from engines.node.
  • Prefer deps.neverBundle / alwaysBundle over deprecated external / noExternal.
  • Default dep policy: package dependencies/peers are externalized; used devDependencies may be bundled — override with deps when wrong.
  • Install typescript for dts (unless oxc fast path via isolatedDeclarations).
  • @tsdown/css / @tsdown/exe must match the tsdown version when used.
  • No stub mode — use --watch and/or exports.devExports.
  • Code splitting is always on — no splitting: false.
  • Pin skill guidance to 0.22.14 unless the project is on 0.23 beta; clear deprecations on 0.22 before jumping to 0.23.
  • Prefer bun / bunx in command examples.

Verification

Prefer repository-owned commands. For meaningful tsdown work, cover the relevant subset:

  • bunx tsdown --version and confirm Node engine for the CLI.
  • Clean build: bunx tsdown / bun run build; inspect dist formats and extensions (.mjs/.cjs/.js).
  • Types: consume .d.ts / exports.types from a dependent package or tsc.
  • Dual-format: require + import smoke when format includes both.
  • After exports: true: validate package.json with publint/attw if enabled.
  • Migration: zero deprecation warnings on 0.22 before upgrading to 0.23+.

Report which checks ran, which did not, and any version assumptions that remain.