TypeScript Library Packaging (2026)

The 2026 defaults

Public npm library (new project)

ESM-only  ·  "type": "module"  ·  exports map with "types" first
tsdown or tsc for build  ·  .d.ts + .d.ts.map for types
moduleResolution: "nodenext"  ·  target: "es2022"
erasableSyntaxOnly: true  ·  verbatimModuleSyntax: true
Validate with publint + arethetypeswrong

Internal monorepo package