The main field of your package.json points to index.js but it's internally is in ES6 format. I guess it will break npm expecting main to point to commonjs packages. Instead module field is proposed for ES6 modules and the extension is .mjs, so index.mjs.
I experiment with modules in Node v12 and currently this code:
// node --experimental-modules this-file.mjs
import LocalEchoController from 'local-echo';
throws:
.../node_modules/local-echo/index.js:1
import LocalEchoController from "./lib/LocalEchoController";
^^^^^^^^^^^^^^^^^^^
SyntaxError: Unexpected identifier
at Module._compile (internal/modules/cjs/loader.js:718:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:785:10)
at Module.load (internal/modules/cjs/loader.js:641:32)
at Function.Module._load (internal/modules/cjs/loader.js:556:12)
at internal/modules/esm/translators.js:87:15
at Object.meta.done (internal/modules/esm/create_dynamic_module.js:45:9)
at file:///home/ilyaigpetrov/Projects/subterm/node_modules/local-echo/index.js:10:13
at ModuleJob.run (internal/modules/esm/module_job.js:111:37)
at async Loader.import (internal/modules/esm/loader.js:128:24)
The
mainfield of yourpackage.jsonpoints toindex.jsbut it's internally is in ES6 format. I guess it will break npm expectingmainto point to commonjs packages. Insteadmodulefield is proposed for ES6 modules and the extension is.mjs, soindex.mjs.I experiment with modules in Node v12 and currently this code:
throws: