Getting started javascript example from the docs does not work with nodejs

[nikumbgo12345]

getting exception as below when trying to run the example in nodejs setup , i am a new to libp2p world , any help is appreciated

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in/samplenode/node-hello-master/node_modules/@libp2p/mdns/package.json
at new NodeError (node:internal/errors:372:5)
at throwExportsNotFound (node:internal/modules/esm/resolve:472:9)
at packageExportsResolve (node:internal/modules/esm/resolve:693:7)
at resolveExports (node:internal/modules/cjs/loader:482:36)
at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object. (/samplenode/node-hello-master/index.js:2:14) {
code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

---

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in/samplenode/node-hello-master/node_modules/libp2p/package.json
at new NodeError (node:internal/errors:372:5)
at throwExportsNotFound (node:internal/modules/esm/resolve:472:9)
at packageExportsResolve (node:internal/modules/esm/resolve:693:7)
at resolveExports (node:internal/modules/cjs/loader:482:36)
at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object. (/samplenode/node-hello-master/index.js:1:22) {
code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'

class used
app.txt

/samplenode/node-hello-master$ node -v
v16.15.1
samplenode/node-hello-master$ npm -v
9.5.1

package,.json

{
"name": "node-hello",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"repository": {
"type": "git",
"url": "git+https://github.com/johnpapa/node-hello.git"
},
"keywords": [],
"author": "",
"license": "ISC",
"bugs": {
"url": "https://github.com/johnpapa/node-hello/issues"
},
"homepage": "https://github.com/johnpapa/node-hello#readme",
"dependencies": {
"@chainsafe/libp2p-noise": "^11.0.1",
"@libp2p/mdns": "^7.0.0",
"@libp2p/mplex": "^7.1.1",
"@libp2p/tcp": "^6.1.2",
"@libp2p/websockets": "^5.0.4",
"libp2p": "^0.42.2"
}
}

[achingbrain]

You cannot use require to load libp2p, it is an ESM-only module. Please use import or if you have to use CJS for whatever reason, use a dynamic import().

[nikumbgo12345]

the issue seems compatibility related , the library does not work with 16.0.0 however started working with node version 18 that also only 18.0.0, so it would be nice to share with the first time users the exact version on node and npm when we test a particular release

[fcbrandon]

Bringing this back up rather than creating a new ticket.

The issue is that the example documentation is errant how it's currently written: https://github.com/libp2p/js-libp2p/tree/master/examples/pubsub

1.js uses import, but the README shows the example being run as such:

> node 1.js
connected to QmWpvkKm6qHLhoxpWrTswY6UMNWDyn8hN265Qp9ZYvgS82
node1 received: Bird bird bird, bird is the word!
node1 received: Bird bird bird, bird is the word!

I'm on Node.js v19.8.1.

[jehaverlack]

I think I'm seeing the same issue:
libp2p/docs#361