Eui: Flaws in ESM Build result in failure to build with Vite, Snowpack, etc.

[joshacheson]

Issue: When including @elastic/eui in a project and using vitejs/vite or pikapkg/snowpack to build, a build fails.

Investigation so far: The best way to get a summary of investigation so far into this issue (that may or may not continue) is probably to look at this issue in vitejs/vite.

I'm filing this issue mostly for awareness, and of course don't hold any expectation that anyone investigates this, fixes it, etc. I have moved on to using CRA because the benefits of @elastic/eui outweighed the benefits of vite or snowpack for my use case.

Cheers

[chandlerprall]

Thanks for reporting and cross-referencing! For completeness & transparency, we have #3437 tracking a known class of issues with EUI+CRA in development mode.

[chandlerprall]

Looking through the vite issue linked above, https://github.com/vitejs/vite/issues/280#issuecomment-635444883 has the specific details: EUI itself is ESM compatible (or is theoretically, as we've never proven that and the dynamic icon import may or may not work in a pure browser ESM context), but has cjs-only dependencies - some of which are mentioned in that comment.

[lemcii]

Snowpack seems to somewhat work, with this workaround:

var reactIs = require("react-is")
var lodash = require("lodash")

module.exports = {
  extends: "@snowpack/app-scripts-react",
  scripts: {},
  plugins: [],
  installOptions: {
    rollup: {
      namedExports: {
        "node_modules/@elastic/eui/node_modules/react-is/index.js": Object.keys(reactIs),
        "node_modules/lodash/lodash.js": Object.keys(lodash),
      },
    },
  },
}

However none of the icons want to work, I'm getting this at runtime:

Loading module from “http://localhost:8080/web_modules/@elastic/assets/'%20+%20typeToPathMap[iconType]%20+%20'.js” was blocked because of a disallowed MIME type (“”).
localhost:8080
Loading failed for the module with source “http://localhost:8080/web_modules/@elastic/assets/'%20+%20typeToPathMap[iconType]%20+%20'.js”. localhost:8080:698:1
TypeError: error loading dynamically imported module

[chandlerprall]

@lemcii do you have a repo available with that setup I could test with?

[lemcii]

@chandlerprall sure, here https://github.com/lemcii/snowpack-eui-test

[FredKSchott]

As of the latest Snowpack, namedExports should no longer be required thanks to an internal rollup upgrade.

[lemcii]

Thanks, upgrade the example and removed the namedExports workaround above.

Did have this error:

Uncaught ReferenceError: global is not defined
    web_modules elastic/eui.js:192579

Used a workaround from this issue, imagine this may be "fixed" by Snowpack later.

[FredKSchott]

+1, we should be able to handle global without the need for a node polyfill plugin

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