V2.7.3 alias to web_modules doesn't generate dependencies

[lummie]

I have the following snowpack config:

module.exports = {
  extends: '@snowpack/app-scripts-lit-element',
  scripts: {
  },
  plugins: [],
  buildOptions: {
    clean: true,
    baseUrl: '',
  },
  alias: {
    '@modules': './web_modules',
  },
  installOptions: {
    rollup: {
      plugins: [require('rollup-plugin-node-polyfills')()],
    },
  },
  devOptions: {
    bundle: false,
    out: 'build',
    open: 'default',
  },
};

I'm utilising the new top level alias available in 2.7.3, to output on build relative paths for web_modules. This all works correctly wrt to the paths.

e.g. I now import as import { LitElement, html, css } from '@modules/lit-element'; in a file src/subdir/file.js and it builds to import{LitElement as a,html as b,css as c}from"../../web_modules/lit-element.js";

I went through the project and replaced ALL the web_module imports from @xxx/yyy to @modules/xxx/yyy

Running in dev mode works, web_modules and the files are served.

However, when I do a build, it no longer writes out ANY code in the web_modules directory, the directory isn't even created.

[lummie]

I have just tried to create a reproducible example, and that doesn't work in dev mode either. Apparently when running my main project even with node_modules/.bin/snowpack dev --config snowpack.dev.js --reload it was finding lit-element in the node_modules/.cache directory.

On the new example project this doesn't exist so I now get

  [error] [404] /web_modules/lit-element.js
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/node_modules/.cache/snowpack/dev/lit-element.js
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/public/web_modules/lit-element.js
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/public/web_modules/lit-element.mjs
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/public/web_modules/lit-element.jsx
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/public/web_modules/lit-element.ts
    ✘ /Users/matt/dev/misc/issue-snowpack-alias/public/web_modules/lit-element.tsx

Which is at least now reported by the dev process.

I still expected that it would work out I'd aliased lit-element to @modules/lit-element and installed the dependency in to web_modules

Minimal Issue example at https://github.com/lummie/issue-snowpack-alias

[FredKSchott]

Snowpack will alias your web_modules for you automatically, so you should just be able to do import "lit-element".

We just cleaned up these docs: https://www.snowpack.dev/#import-npm-packages