There are 2 repositories under typescript-library-boilerplate topic.
Example TypeScript Package ready to be published on npm & Tutorial / Instruction / Workflow for 2021
Initialize it running "node ./setup.js". A TypeScript library boilerplate. Check types pretty strictly; generates CommonJS, ESM and UMD bundles with Rollup.js; setup unit tests with Jest; and generate docs from sources with Typedoc.
A very simple Typescript library starter.
Boilerplate for starting modern typescript libraries.
Create new NPM Packages with TypeScript.
my typescript library template
A template for creating Typescript libraries with ease
boilerplate to develop library in typescript with eslint, prettier, webpack