Using node.js experimental loaders with rollup

Question

I am using rollup to bundle my Node.js applications - it allows me to deploy them in production as a single file without relying on npm .

I also happen to have my own custom loaders for some special format files that I import in my code by calling

node --experimental-loader=./lib/txt-colormap-es-loader.mjs and then doing

import colormap from './colormaps/01.txt';

One of these is handlebars for which there is a special plugin in rollup.

But I also have my own custom formats with my own custom loaders.

Does anyone see any way I could make rollup work with my custom ES6 loader in Node.js short of writing a new plugin?

Answer 1

I found a suboptimal solution without developing/publishing/maintaining a new rollup plugin - import the loader itself and call it manually on the file imported as a string. Importing as a string can be accomplished

• In development, before bundling, by

  https://www.npmjs.com/package/import-as-string

• In production, with rollup, by

  https://www.npmjs.com/package/rollup-plugin-string