[Bug] LegacyMigrationResolver fails to handle aliases

[merceyz]

• I'd be willing to implement a fix

Describe the bug

The LegacyMigrationResolver fails to convert aliases from Yarn V1.
This part of the lockfile is parsed to vue-loader-v16@16.0.0-beta.8 instead of vue-loader@16.0.0-beta.8

"vue-loader-v16@npm:vue-loader@^16.0.0-beta.7":
  version "16.0.0-beta.8"

To Reproduce

Reproduction

---

Playground

await packageJson({
 dependencies: {
 	'vue-loader-v16': 'npm:vue-loader@^16.0.0-beta.7',
 },
});

require('fs').writeFileSync(
 `yarn.lock`,
 `# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1

"vue-loader-v16@npm:vue-loader@^16.0.0-beta.7":
version "16.0.0-beta.8"
resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-16.0.0-beta.8.tgz#1f523d9fea8e8c6e4f5bb99fd768165af5845879"
integrity sha512-oouKUQWWHbSihqSD7mhymGPX1OQ4hedzAHyvm8RdyHh6m3oIvoRF+NM45i/bhNOlo8jCnuJhaSUf/6oDjv978g==
`
);

await expect(yarn(`install`)).resolves.toBeTruthy();

Output:

Error: �[2mexpect(�[22m�[31mreceived�[39m�[2m).�[22mresolves�[2m.�[22mtoBeTruthy�[2m()�[22m

Received promise rejected instead of resolved
Rejected to value: �[31m[Error: Command failed: /usr/local/bin/node /sandbox/berry/scripts/actions/../run-yarn.js install·�[39m
�[31m➤ YN0000: ┌ Resolution step�[39m
�[31m➤ YN0016: │ vue-loader-v16@npm:16.0.0-beta.8: Registry failed to return reference "16.0.0-beta.8"�[39m
�[31m➤ YN0000: └ Completed�[39m
�[31m➤ YN0000: Failed with errors in 0s 159ms�[39m
�[31m]�[39m
 at expect (/sandbox/node_modules/expect/build/index.js:138:15)
 at module.exports (evalmachine.<anonymous>:20:7)

---

Environment if relevant (please complete the following information):

• OS: Windows 7
• Node version: v12.19.0
• Yarn version: 2.3.3.dev

[yarnbot]

We couldn't reproduce your issue (all the assertions passed on master).

[Knagis]

I can confirm that this issue is reproducible. In my case "mock-socket-6": "npm:mock-socket@6.0.4", was installed with yarn v1 but the yarn.lock triggered error when running first install on yarn 2.4.0

[Petercopter]

Confirmed here as well. Attempting to migrate from Yarn 1 to Berry. Running yarn install while following the migration guide.

Relevant Yarn 1 yarn.lock lines:

"@vue/cli-service@^4.0.0":
  version "4.5.11"
  resolved "https://registry.yarnpkg.com/@vue/cli-service/-/cli-service-4.5.11.tgz#b157e2eee2351889cbbd4ccb4a4a9d8575409175"
  integrity sha512-FXeJh2o6B8q/njv2Ebhe9EsLXt9sPMXGDY5zVvcV5jgj9wkoej9yLfnmwWCau5kegNClP6bcM+BEHuMYxJ+ubQ==
  dependencies:
    ...
  optionalDependencies:
    vue-loader-v16 "npm:vue-loader@^16.1.0"

$ yarn install
> YN0000:  Resolution step

i [Error]: vue-loader-v16@npm:16.1.2: Registry failed to return reference "16.1.2"
    at Object.resolve (/Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:231391)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:94:5)
    at async n.resolve (/Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:336461)
    at async n.resolve (/Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:336461)
    at async /Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:356788
    at async Module.w (/Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:417407)
    at async d (/Users/peter/work/performance-frontend/.yarn/releases/yarn-berry.cjs:2:356751)
    at async Promise.all (index 48) {
  reportExtra: undefined,
  reportCode: 16
}

Now what I found interesting was that there IS a vue-loader-v16 package in the npm registry:
https://www.npmjs.com/package/vue-loader-v16

The user was nice enough to be sure and mark it as a learning package. But notice how Berry was trying to install vue-loader-v16@npm:16.1.2. The only reason it failed is because that forked package doesn't have that version number.

So something with aliases does appear to be going very sideways.