Export Members from a TypeScript NPM Package

The short memo on how to conveniently export members of a TypeScript NPM package.

Context

Let us export members of a TypeScript package in the index.ts file to be accessible by package consumers with namespaces, aliases or rename.

[!WARNING] The namespaced exports somehow break eslint detects TypeScript types of the imported package members. Will see in practice how it reveals.

In the concrete case below it could come from either 1) the import and export names were the same in direct export and the namespaced export or 2) just because namespaced export types were not recognized by eslint.

The examples of an npm package members exports (usually from index.ts file).

Beforehand set "module": "NodeNext" and "moduleResolution": "NodeNext" in tsconfig.json compilerOptions settings.

// index.ts
'use strict';

/**
 * Export one line with no need preceding import.
 */
export { EHTTPMethods, 
    default as HTTPMethodsConvenience, type TCustomHTTPMethodsConstraint 
} from './core/methods/HTTPMethodsConvenience.js';

/**
 * Export under a namespace.
 * Note the trick: members are aliased at import with `_` prefix and "de-aliased" back to
 * the original names at export. 
 */
import {
    EHTTPMethods as _EHTTPMethods,
    default as _HTTPMethodsConvenience,
    type TCustomHTTPMethodsConstraint as _TCustomHTTPMethodsConstraint
} from './core/methods/HTTPMethodsConvenience.js';


export namespace HTTPConveniencePack {
    export import EHTTPMethods = _EHTTPMethods;
    export type TCustomHTTPMethodsConstraint = _TCustomHTTPMethodsConstraint;
    export class HTTPMethodsConvenience extends _HTTPMethodsConvenience { };
}