No valid exports main found for 'C:\ha-lib\node_modules\home-assistant-js-websocket'

[alexciesielski]

I am trying to integrate this client into my NodeJS library but I am having the following issue when compiling and running my (currently very simple) app.

Repo can be found here: https://github.com/ciesielskico/home-assistant-rxjs

FIrst things first:

• home-assistant-js-websocket: v5.1.0
• ws: v7.2.3
• Node: v13.8.0
• Typescript: v3.8.3

Error: No valid exports main found for 'C:\ha-lib\node_modules\home-assistant-js-websocket'
at resolveExportsTarget (internal/modules/cjs/loader.js:632:9)
at applyExports (internal/modules/cjs/loader.js:500:14)
at resolveExports (internal/modules/cjs/loader.js:549:12)
at Function.Module._findPath (internal/modules/cjs/loader.js:664:22)
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:967:27)
at Function.Module._load (internal/modules/cjs/loader.js:862:27)
at Module.require (internal/modules/cjs/loader.js:1040:19)
at require (internal/modules/cjs/helpers.js:72:18)
at Object. (C:\ha-lib\src\index.ts:1:1)
at Module._compile (internal/modules/cjs/loader.js:1151:30)

tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "lib": ["es6"],
    "outDir": "./dist",
    "rootDir": "./src",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true
  },
  "include": ["src"]
}

src/index.ts

import {
  createConnection,
  createLongLivedTokenAuth,
} from 'home-assistant-js-websocket';
import { from } from 'rxjs';
import { createSocket } from './connection/connection';

export class HomeAssistant {
  async initialize() {
    const auth = createLongLivedTokenAuth(
      'ws://homeassistant:8123',
      'my_token',
    );
      
    return await createConnection({
      createSocket: () => createSocket(auth, true),
    });
  }
}

const connection = from(new HomeAssistant().initialize());
connection.subscribe(console.log);

The createSocket function is taken from the link in your example for NodeJS applications.

I have googled the error message but to my surprise could find only a handful of posts matching that exact error related to some problems with merge-anything package.

I'm pretty sure I'm doing something wrong but I just cannot see what it is, maybe you guys will?

[alexciesielski]

I just downgraded node using nvm to 11.14.0 and the error disappeared 🤔 so it must be something with latest nodejs.

[balloob]

We are leveraging the new exports field that the new node supports:

home-assistant-js-websocket/package.json

Lines 11 to 14 in ad3b2b8

	"exports": {
	"import": "dist/index.js",
	"default": "dist/haws.umd.js"
	},

For runtimes that can resolve import, it should point at index.js, which for 5.1.0 looks like this: https://unpkg.com/browse/[email protected]/dist/index.js

All others are pointing at a build in UMD format so supports module.exports, require etc and can be found here https://unpkg.com/browse/[email protected]/dist/haws.umd.js

From your stack trace it looks like it is using the commonjs importer for our package.

Can you try the following with Node 13: open your node_modules/home-assistant-js-websocket/package.json and remove the line that says "type": "module",

[alexciesielski]

I'm not sure what I have changed over the weekend when working with NodeJS 11 but I reinstalled NodeJS 13 (13.12.0 this time as opposed to 13.8.0) again and I am getting the following error:

tsnd --respawn src/index.ts --host http://homeassistant:8123

Using ts-node version 8.8.1, typescript version 3.8.3
Error [ERR_INVALID_PACKAGE_TARGET]: Invalid "exports" main target "dist/haws.umd.js" defined in
the package config /C:/Users/Alex/Documents/homeassistant-rxjs/node_modules/home-assistant-js-websocket\package.json
at resolveExportsTarget (internal/modules/cjs/loader.js:574:13)
at resolveExportsTarget (internal/modules/cjs/loader.js:621:20)
at applyExports (internal/modules/cjs/loader.js:503:14)
at resolveExports (internal/modules/cjs/loader.js:541:12)
at Function.Module._findPath (internal/modules/cjs/loader.js:661:22)
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:963:27)
at Function.Module._load (internal/modules/cjs/loader.js:859:27)
at Module.require (internal/modules/cjs/loader.js:1036:19)
at require (internal/modules/cjs/helpers.js:72:18)
at Object. (C:\Users\Alex\Documents\homeassistant-rxjs\src\connection\connection.ts:8:1)

Removing "type": "module" does not change the error.

Quick google search tells me this:

ERR_INVALID_PACKAGE_TARGET#
The package.json exports field contains an invalid target mapping value for the attempted module resolution.

https://nodejs.org/api/errors.html#errors_err_invalid_package_target

Changing the exports.default property to dist/index.js doesn't change the error message (besides the file name now being dist/index.js of course).

[alexciesielski]

Something interesting: removing the "export" property altogether from your package.json fixes the error in Node 11, 12 and 13.