This Koa middleware dynamically rewrites Node.js bare module specifiers (e.g., `import { foo } from "stuff";`) into relative paths (e.g., `./node_modules/stuff/index.js`) on the fly, directly within HTML and JavaScript files served by the Koa server. It's specifically designed to facilitate modern JavaScript module development in browsers without requiring a separate build step, by resolving module paths using the same rules as Node.js `require()`. The package is currently in a pre-release state (version `1.0.0-pre.9`), indicating ongoing active development towards a stable `1.0.0` release, though no specific release cadence is published. Its key differentiator lies in its real-time, on-demand transformation capabilities, making it highly suitable for rapid iteration in development servers, integrated testing environments (such as those using Karma), and simple static file serving. However, it explicitly carries a significant caveat: it is *not* recommended for high-volume production use due to the inherent performance overhead associated with parsing and transforming HTML and JavaScript content on every request. This focus on development efficiency over production performance is a core design principle.
npm install koa-node-resolveVerified import paths — ran on the pinned version, not inferred.
Sets up a basic Koa development server with `koa-node-resolve` to dynamically transform bare module specifiers in served HTML and JavaScript files to relative paths, making them runnable directly in browsers without a build step. It also includes `koa-static` for serving files.
Do not use `koa-node-resolve` in production. Implement a build step (e.g., Rollup, Webpack, esbuild) for production deployments to pre-bundle and optimize modules.
Be prepared for potential API changes and breaking alterations when updating versions. Refer to the GitHub repository's commit history or pre-release changelogs for specific updates.
Ensure `npm install --save-dev koa` is run, and `const Koa = require('koa');` is at the top of your server file, followed by `new Koa()` to create the server instance.Verify that the `root` option passed to `nodeResolve()` accurately reflects the base directory where your `node_modules` folder and served files reside. Ensure the module is actually installed and accessible from that `root`.
Ensure your Node.js environment is configured for ESM by either adding `"type": "module"` to your `package.json` or by using the `.mjs` file extension for your server file. Alternatively, stick to CommonJS `require()` syntax as shown in the package's quickstart example.