Vitest loads multiple formats of the same package #747

marvinhagemeister · 2022-02-13T23:05:53Z

Describe the bug

During a test run it seems like libraries can be loaded twice when something requests a commonjs module and something else the ESM variant.

TypeError [Error]: Cannot read properties of null (reading 'context')
    at Proxy.exports.useContext (/app/node_modules/preact/hooks/dist/hooks.js:1:2437)
    at d.ExampleConsumer [as constructor] (/app/app/src/preact-bug.test.jsx:38:41)
    at d.M [as render] (/app/node_modules/preact/dist/preact.js:1:7837)
    at j (file:///app/node_modules/preact/dist/preact.mjs:1:5752)
    at file:///app/node_modules/preact/dist/preact.mjs:1:1494
    at Array.some (<anonymous>)
    at g (file:///app/node_modules/preact/dist/preact.mjs:1:1392)

As indicated by the stack trace, somehow preact.mjs AND preact.js are loaded. This sounds like vite or vitest is including both a CommonJS and an ESM Module of the same library.

(Originally reported at preactjs/preact#3220)

Reproduction

Clone https://github.com/dancras/preact-bug
Run npm install
Run npm run vitest

System Info

System:
    OS: macOS 12.1
    CPU: (8) arm64 Apple M1
    Memory: 92.44 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.6.2 - ~/.nvm/versions/node/v16.6.2/bin/node
    Yarn: 1.22.17 - /opt/homebrew/bin/yarn
    npm: 7.20.3 - ~/.nvm/versions/node/v16.6.2/bin/npm
    Watchman: 2021.10.18.00 - /opt/homebrew/bin/watchman
  Browsers:
    Brave Browser: 89.1.21.73
    Chrome: 98.0.4758.80
    Chrome Canary: 100.0.4886.0
    Edge: 98.0.1108.51
    Firefox: 96.0.3
    Safari: 15.2
  npmPackages:
    vite: ^2.8.0 => 2.8.0 
    vitest: ^0.3.2 => 0.3.2

Used Package Manager

npm

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The text was updated successfully, but these errors were encountered:

sheremet-va · 2022-02-14T07:25:28Z

To import libraries we use native import. And node doesn't understand module field, so I added exports field, and now I get another error.

  "exports": {
    ".": {
      "import": "./dist/hooks.mjs",
      "require": "./dist/hooks.js"
    }
  },

TypeError: Cannot read properties of undefined (reading '__H')
❯ m node_modules/preact/hooks/dist/hooks.module.js:110:20

❯ p node_modules/preact/hooks/dist/hooks.module.js:138:2
❯ Object.l node_modules/preact/hooks/dist/hooks.module.js:135:19
❯ d.ExampleProvider [as constructor] src/preact-bug.test.jsx:12:30
❯ d.M [as render] node_modules/preact/dist/preact.js:1:7837
❯ I node_modules/preact/dist/preact.js:1:5598
❯ m node_modules/preact/dist/preact.js:1:2096
❯ I node_modules/preact/dist/preact.js:1:5831
❯ N node_modules/preact/dist/preact.js:1:7951
❯ node_modules/@testing-library/preact/dist/pure.js:90:26
❯ exports.act node_modules/preact/test-utils/dist/testUtils.js:1:790
❯ Proxy.render node_modules/@testing-library/preact/dist/pure.js:86:22
❯ src/preact-bug.test.jsx:43:4
❯ runTest node_modules/vitest/dist/entry.js:1728:40
❯ async runSuite node_modules/vitest/dist/entry.js:1792:13
❯ async runSuites node_modules/vitest/dist/entry.js:1820:5
❯ async startTests node_modules/vitest/dist/entry.js:1825:3
❯ async node_modules/vitest/dist/entry.js:1849:7
❯ async withEnv node_modules/vitest/dist/entry.js:1479:5
❯ async run node_modules/vitest/dist/entry.js:1848:5

marvinhagemeister · 2022-02-14T09:11:16Z

That's interesting. I would've assumed that bundlers only look at the top level package.json of a package where all the export mapping happens.

sheremet-va · 2022-02-14T09:16:26Z

That's interesting. I would've assumed that bundlers only look at the top level package.json of a package where all the export mapping happens.

Vitest is not a bundler tho, it's more of a runner, and we dont use Vite to bundle code, only to transpile it. Also we don't perform Vite's transformations on node_modules for perfomance reasons, but it's possible to deps.inline them using config.

marvinhagemeister · 2022-02-14T10:23:40Z

FYI: The issue described here seems to relate to the "dual package hazard" section in Node's module docs: https://nodejs.org/api/packages.html#dual-package-hazard

sheremet-va · 2022-02-14T10:25:07Z

FYI: The issue described here seems to relate to the "dual package hazard" section in Node's module docs: https://nodejs.org/api/packages.html#dual-package-hazard

Yes, I think this is due to testing-library being cjs only. It requires preact to render, then user code imports hooks from mjs, where currentComponent is undefined

sheremet-va · 2022-02-14T10:28:08Z

So, to fix this we need to:

Either

Have exports field in all of preact packages
AND build ESM testing-library

Or

Somehow import only cjs versions in Vitest of these libraries, but this is harder, since we are ESM first, and it would be quite a rewrite - maybe some kind of config option will be necessary, but I would prefer the first variant, since it will work by default for most users

marvinhagemeister · 2022-02-14T12:43:50Z

Agree that pushing for ESM rather than moving back to CJS seems like the preferable move. Maybe if testing-library is ESM that problem will be resolved.

sheremet-va · 2022-02-14T12:55:49Z

Agree that pushing for ESM rather than moving back to CJS seems like the preferable move. Maybe if testing-library is ESM that problem will be resolved.

I see it wasn't updated for quite some time now. Will try and create an issue there. Also, having exports is highly encouraged for native Node module resolution. That way we don't need to guess what file to load :p

danielweck · 2022-04-01T12:51:37Z

Yep, my Preact hook tests are broken because of this :)
I am going to try using preact/text-utils directly instead...

userquin · 2022-04-01T13:00:34Z

Somehow import only cjs versions in Vitest of these libraries, but this is harder, since we are ESM first, and it would be quite a rewrite - maybe some kind of config option will be necessary, but I would prefer the first variant, since it will work by default for most users

maybe this can help to load cjs https://github.com/iconify/iconify/blob/master/packages/utils/vitest.config.cjs running:
vitest --config vitest.config.cjs

danielweck · 2022-04-01T13:38:43Z

Ah, my workaround is to delete / rename node_modules/preact/hooks/package.json, which interferes with the top-level import map in node_modules/preact/package.json (which itself references preact/hooks)
👍

brianblakely · 2022-04-15T13:41:11Z

Running vitest in --no-threads mode resolved this issue for me. Although there are other issues now as a result of doing that, they seem more manageable.

danielweck · 2022-05-25T15:44:39Z

There's an update: testing-library/preact-testing-library#50 (comment)
Unfortunately still fails at my end, so my workaround persists :)
(basically, a copy of https://github.com/testing-library/preact-testing-library/blob/1f9851894ff4fc772addef39855ecc0d8b219dca/src/pure.js and https://unpkg.com/browse/@testing-library/[email protected]/types/index.d.ts in my ESM / TS codebase)

danielweck · 2022-05-26T19:47:20Z

Another update: fixed now :)
testing-library/preact-testing-library#50 (comment)

wight554 · 2022-05-27T21:07:41Z

Another update: fixed now :) testing-library/preact-testing-library#50 (comment)

Have you managed to get everything working ootb?
Last (>3.0.2) preact-testing library updates breaks preact/hooks import for me like here: preactjs/preact#2690

wight554 · 2022-05-28T09:55:22Z

Another update: fixed now :) testing-library/preact-testing-library#50 (comment)

Have you managed to get everything working ootb? Last (>3.0.2) preact-testing library updates breaks preact/hooks import for me like here: preactjs/preact#2690

for those who came with typescript 4.7 and new module resolution config:
While @testing-library/preact fully supports esm, some of modules you use may not, eg recoil, mui (which is weird actually) in my case. That leads to CJS/ESM import issues (like preact/hooks error). To workaround this, use TypeScript CJS import interop:

import tlp = require('@testing-library/preact');

const { screen, waitFor, fireEvent, cleanup } = tlp;

Another solution is to use @testing-library/preact of version 3.0.2 and lower

That did help in my case. If anyone has better solution, please share. Forcing everyone to have proper ESM support is nice, but it may take a lot of time

danielweck · 2022-05-29T15:53:54Z

Thanks for the tip @wight554
As mentioned previously in this thread, what worked for me is the following (but I appreciate that projects with different dependency trees might experience different issues):

Ah, my workaround is to delete / rename node_modules/preact/hooks/package.json, which interferes with the top-level import map in node_modules/preact/package.json (which itself references preact/hooks)

sheremet-va · 2022-06-13T11:55:58Z

Fixed, according to #747 (comment)

This fixes an issue with Preact + Vite + SSR. Without the export maps, Vite SSR and Node.js gets confused and loads both the ESM and CJS versions of Preact. This breaks the hooks system of Preact as discussed here[1] and here[2]. During SSR, Vite starts as ESM and loads my modules (and Preact). But when I load React-Router, as it does not have the exports map, Node loads the CJS version, which loads the CJS version of Preact. Then Preact breaks because it can't find the hooks registered in the ESM code. Also, in the version of Node that I tested, v16.14.0, Node printed the warning below, so I also changed the extension of the ES module for node from ".js" to ".mjs". (node:5753) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension. [1] preactjs/preact#3220 (comment) [2] vitest-dev/vitest#747 (comment)

marvinhagemeister mentioned this issue Feb 13, 2022

Possible race condition leading to "TypeError: Cannot read property 'context' of undefined" preactjs/preact#3220

Closed

sheremet-va mentioned this issue Feb 14, 2022

When using Preact and Svelte Vite plugins together, Preact tests suddenly fail #737

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6 tasks

sheremet-va added the upstream label Feb 14, 2022

sheremet-va mentioned this issue Feb 14, 2022

Add ESM support testing-library/preact-testing-library#50

Closed

smarlhens mentioned this issue May 17, 2022

How to use hljsVuePlugin in unit test w/ vitest + @testing-library/vue ? highlightjs/vue-plugin#30

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frankwallis mentioned this issue May 28, 2022

Testing with Vitest vanilla-extract-css/vanilla-extract#666

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sheremet-va closed this as completed Jun 13, 2022

danielweck mentioned this issue Jun 13, 2022

Add exports field to subpackages to align module resolution with the root level package.json preactjs/preact#3564

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wight554 mentioned this issue Jul 26, 2022

Can not run tests when using preact compat alias #1652

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rhengles mentioned this issue Mar 8, 2023

fix: Add export maps and .mjs to node ES modules (Fixes #10172) remix-run/react-router#10175

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Vitest loads multiple formats of the same package #747

Vitest loads multiple formats of the same package #747

marvinhagemeister commented Feb 13, 2022 •

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sheremet-va commented Jun 13, 2022

Vitest loads multiple formats of the same package #747

Vitest loads multiple formats of the same package #747

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marvinhagemeister commented Feb 13, 2022 • edited by sheremet-va Loading

Describe the bug

Reproduction

System Info

Used Package Manager

Validations

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