TypeScript Library Development Tutorial: Publish Runtime Exports with Accurate Declarations
A TypeScript library publishes executable behavior alongside declarations describing its public interface. Export paths, module formats and declaration resolution need to agree for consumers to load and check the package correctly. A clean public contract avoids exposing accidental internal dependencies and should be tested from a consumer's perspective rather than only inside the library source tree.
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Why Use TypeScript Library Development Tutorial: Publish Runtime Exports with Accurate Declarations
- Define a deliberate public export surface
- Keep runtime and declaration entry points aligned
- Generate declarations without leaking implementation details
- Understand consumer module-resolution context
- Verify use from an external sample project
Frequently Asked Questions
What does a declaration file provide to consumers?
It describes supported values and type relationships for checking. The executable implementation must still be available through the package's runtime exports, because declarations alone do not supply its functions or objects.
Why test a package outside its source tree?
Local paths and development dependencies can conceal missing published files or unresolved declarations. An external consumer tests the actual export and resolution contract rather than the library's privileged internal setup.
What is an accidental public dependency?
It is an internal type or path exposed through declarations that consumers must resolve unexpectedly. Inspect emitted APIs so the public contract does not depend on unpublished internals or undeclared packages.
Does successful declaration generation prove runtime imports work?
It establishes a declaration output under the build procedure. Runtime loading follows package exports and module rules, so test that behavior separately from the availability of static descriptions.
Why consider downstream compiler compatibility?
Consumers interpret declaration syntax and module conventions through their supported tooling. A library's own successful build does not establish that every targeted consumer can parse or resolve its published contract.