Incompatible with Yarn 2

[araujogui]

Describe the bug
Yarn 2.4.1 fails to run Svelte Kit's scripts.

Logs

➤ YN0000: ┌ Resolution step
➤ YN0032: │ fsevents@npm:2.3.2: Implicit dependencies on node-gyp are discouraged
➤ YN0032: │ fsevents@npm:2.3.2: Implicit dependencies on node-gyp are discouraged
➤ YN0002: │ @sveltejs/vite-plugin-svelte@npm:1.0.0-next.6 [6e7b7] doesn't provide rollup (p9cae2), requested by @rollup/pluginutils
➤ YN0000: │ Some peer dependencies are incorrectly met; run yarn explain peer-requirements <hash> for details, where <hash> is the six-letter p-prefixed code
➤ YN0000: └ Completed in 11s 534ms
➤ YN0000: ┌ Fetch step
➤ YN0013: │ vite@npm:2.1.5 can't be found in the cache and will be fetched from the remote registry
➤ YN0013: │ which@npm:2.0.2 can't be found in the cache and will be fetched from the remote registry
➤ YN0013: │ wide-align@npm:1.1.3 can't be found in the cache and will be fetched from the remote registry
➤ YN0013: │ wrappy@npm:1.0.2 can't be found in the cache and will be fetched from the remote registry
➤ YN0013: │ yallist@npm:4.0.0 can't be found in the cache and will be fetched from the remote registry
➤ YN0000: └ Completed in 2s 749ms
➤ YN0000: ┌ Link step
➤ YN0007: │ svelte-preprocess@npm:4.7.0 [2d2f7] must be built because it never did before or the last one failed
➤ YN0000: └ Completed
➤ YN0000: Done with warnings in 14s 455ms

(node:5987) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
/home/araujo/Área de trabalho/eurora.store/.yarn/$$virtual/@sveltejs-kit-virtual-6e7b74d398/0/cache/@sveltejs-kit-npm-1.0.0-next.74-7ec168993f-79c42c4576.zip/node_modules/@sveltejs/kit/svelte-kit.js:2
import './dist/cli.js';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at Object.compileFunction (node:vm:355:18)
    at wrapSafe (node:internal/modules/cjs/loader:1022:15)
    at Module._compile (node:internal/modules/cjs/loader:1056:27)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1121:10)
    at Module.load (node:internal/modules/cjs/loader:972:32)
    at Function.external_module_.Module._load (/home/araujo/Área de trabalho/eurora.store/.pnp.cjs:6480:14)
    at Function.executeUserEntryPoint [as runMain] (node

To Reproduce
https://github.com/araujogui/svelte-kit-yarn

Stacktraces
Information about your SvelteKit Installation:

Diagnostics

System: OS: Linux 5.11 Arch Linux CPU: (8) x64 Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz Memory: 365.53 MB / 7.65 GB Container: Yes Shell: 3.2.1 - /usr/bin/fish Binaries: Node: 15.14.0 - /usr/bin/node Yarn: 2.4.1 - /usr/bin/yarn npm: 7.9.0 - /usr/bin/npm Browsers: Brave Browser: 89.1.22.71

Severity
It entirely blocks my usage of SvelteKit.

Additional context
There's no issue when NPM or PNPM.

[thefrana]

Having the same problem, thanks for opening an issue.

[Conduitry]

yarnpkg/berry#638 Yarn 2 does not support ESM in packages. We're not going to ship CJS just for the sake of Yarn 2. I'd suggest using a different package manager and watching that issue.

In the meantime, I am adding the 'documentation' label to this until we note somewhere in the docs or in the starter template that Yarn 1 is fine but Yarn 2 is not.

[orta]

FWIW, that's yarn 2+ with PNP mode (which admittedly is their default).
It should probably work by using the node_modules resolver.

[Rich-Harris]

I've updated the FAQ page, so will close this