lf-api-client-core@1.1.19 won't load under native Node ESM (missing .js on imports)

[timmyGr]

The published ESM build has relative imports without file extensions, which Node's ESM loader rejects. Bundlers and tsx tolerate it, but plain node doesn't.

import { ApiException } from './ApiException';      // needs .js
import { ProblemDetails } from './ProblemDetails';  // needs .js

repro:

npm i @laserfiche/lf-api-client-core@1.1.19
node --input-type=module -e "import('@laserfiche/lf-api-client-core')"

error:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '.../dist/lib/ApiException'
imported from .../dist/lib/BaseTokenClient.js