Failed to load node_modules/snowpack/lib/index.js

[StevenLangbroek]

Hey folks! I'm investigating snowpack for a big React SPA. After init, and adding some minor path configuration, I ended up with this config:

// Snowpack Configuration File
// See all supported options: https://www.snowpack.dev/reference/configuration

/** @type {import("snowpack").SnowpackUserConfig } */
module.exports = {
  mount: {
    /* ... */
  },
  packageOptions: {
    external: [...require('module').builtinModules],
  },
  devOptions: {
    hmr: true,
  },
  buildOptions: {
    /* ... */
  },
  alias: {
    analytics: './src/analytics',
    capabilities: './src/capabilities',
    chrome: './src/chrome',
    css: './src/css',
    graphql: './src/graphql',
    helpers: './src/helpers',
    hooks: './src/hooks',
    i18n: './src/i18n',
    server: './src/server',
  },
};

Now, when I run either yarn snowpack dev or try to run through a custom server, I get this error:

[snowpack] ! building dependencies...
[snowpack] Failed to load node_modules/snowpack/lib/index.js
  Assigning to rvalue (132294:8) in /Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js
[snowpack] (node:75202) UnhandledPromiseRejectionWarning: Error: Install failed.
    at Object.install (/Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js:47808:19)
    at Object.run (/Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js:47867:25)
    at installDependencies (/Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js:49378:27)
    at Object.prepare (/Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js:49433:35)
    at Object.startServer (/Users/stevenlangbroek/Code/pm-web-frontend/node_modules/snowpack/lib/index.js:131149:27)
(Use `node --trace-warnings ...` to show where the warning was created)
[snowpack] (node:75202) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
[snowpack] (node:75202) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I'm not quite sure what this is about, but it sounds... weird? Haha.

I haven't installed any plugins, and am on version 3.0.11 on node 14.15.1.

Is this a known issue? Is there any further info I can provide to be able to debug this?

[StevenLangbroek]

The line mentioned here contains this:

[melissamcewen]

Hi @StevenLangbroek , thanks for reporting. This does seem like it could be a bug so going to pass on to the other maintainers for investigation.

[gryzzly]

Probably not what happened to @StevenLangbroek but I was writing a function called "start" which somehow auto-imported the following line into my index.js entry file:

import { startDevServer } from 'snowpack';

This caused my build not to work anymore with an error like this:

[snowpack] Failed to load node_modules/snowpack/lib/index.js
  Assigning to rvalue (132294:8) in /node_modules/snowpack/lib/index.js

Removing erroneous import fixed my build.

[vvaradarajan]

Probably not what happened to @StevenLangbroek , but I had a local installation of snowpack and a global instalation.
My command in linux:
npx snowpack install #installs locally
npx snowpack install -g #installs globally
#on trying to build:
npx snowpack build => gave Error: Cannot find module './lib/index.js'
npm uninstall snowpack #uninstall local snowpack
npx snowpack build => success!
#comment: Not exactly sure what happens if versions of snowpack exist locally and globally. Which one does it choose..