Dominik Kundel explains how to write a Node.js module using TypeScript, which can be used by both JavaScript developers and TypeScript developers. He starts by creating a new directory for the module, initializing the `package.json` file, installing dependencies such as the TypeScript compiler and the emojione module, configuring the TypeScript project with a `tsconfig.json` file, writing the module code in an `index.ts` file, compiling the code to JavaScript and TypeScript definitions files, preparing the package.json for publishing, and consuming the module in both JavaScript and TypeScript projects. The author notes that there are benefits to using TypeScript, such as better authoring experience, type safety, and down-transpilation of cutting-edge features.