The overwhelming majority of NPM packages are still in CJS, and will not work under Deno today. Yes, you can do hack-arounds like jspm.io/skypack, but if the pe

The overwhelming majority of NPM packages are still in CJS, and will not work under Deno today. Yes, you can do hack-arounds like jspm.io/skypack, but if the person is concerned with stability and/or security, adding a 3rd party middleman into the pipeline will not go down well. Now that Node supports ESM, I hope this year will start seeing more migrations, but it will be at a glacial place because the ESM<->CJS compatibility remains extremely brittle (among all bundlers, and for Node+Browser usage). If you are writing a greenfield small library you can make it work. But it will be a long time - if ever - before we see things like @babel work.