Yarn Berry (v2 & v3) is not supported: Unsupported option name ("--no-lockfile")

[lolmaus]

Hi!

When trying to run yarn test:ember-compatibility in my addon, I receive:

❯ yarn test:ember-compatibility
Unknown Syntax Error: Unsupported option name ("--no-lockfile").

$ yarn install [--json] [--immutable] [--immutable-cache] [--check-cache] [--inline-builds] [--mode #0]
Error!
1
undefined

This is because Yarn Berry does not have the --no-lockfile option.

I cannot use Yarn 1 because it crashes on nohoist: *, and package hoisting in my monorepo breaks many things.

[kategengler]

You can customize the options passed to yarn with the buildManagerOptions() function in the config https://github.com/ember-cli/ember-try/blob/master/README.md#config

However, I think it is worth noting that ember-cli also does not support yarn > 1 https://github.com/ember-cli/ember-cli/issues/8164

[elwayman02]

@kategengler can we revisit this now that ember-cli does in fact support yarn berry? The issue you linked has been closed as the blocking problems were resolved in the last few years.

[kategengler]

I'd be happy to look at a PR, but, in general, yarn support in ember-cli and associated addons is somewhat stale. I opened this issue myself https://github.com/ember-cli/ember-cli/issues/10339 but have since moved to pnpm.

[elwayman02]

I can confirm that yarn berry works generally for ember apps - we've been using it in production for several years now. The main gap is that ember-try forces the non-existent --no-lockfile flag when useYarn is true, and as of Yarn 4+, that actually throws an error which crashes the tests. In Yarn 3, it fails silently instead (but likely still isn't doing the behavior ember-try wants).

As such, I'm less worried about overall yarn support in ember-cli and more about making sure that ember-try isn't actively causing failures while the rest of the ecosystem seems to be working fine.

[kategengler]

I'm happy to look at a PR to support, but until then, the buildManagerOptions above is a decent workaround.