[Bug] Yarn does not include main entrypoint if the package installed from GitHub and does not list entrypoint in files

[larixer]

• I'd be willing to implement a fix

Describe the bug

Yarn does not include main entrypoint if the package installed from GitHub and does not list entrypoint in files

To Reproduce

await packageJsonAndInstall({
  dependencies: {
    "pg-many-to-many": "github:hsanoyan/pg-many-to-many#e4af0e86927d62f3e6c9e8fdfdb8941fa08482fb"
  }
});

await expect(node(`require.resolve('pg-many-to-many')`)).resolves.not.toMatchObject({code: 'MODULE_NOT_FOUND'});

[yarnbot]

The reproduction case in your issue seems broken (ie it neither pass nor fail due to throwing an unmanaged exception):

Error: expect(received).resolves.not.toMatchObject(expected)

Matcher error: received value must be a non-null object

Received has type:  string
Received has value: "/tmp/tmp-27lQBEhAcYDBSI/.yarn/cache/pg-many-to-many-https-57cfeae214-4cab54e880.zip/node_modules/pg-many-to-many/index.js"
    at /github/workspace/.yarn/cache/expect-npm-24.8.0-8c7640c562-0ac41999f0.zip/node_modules/expect/build/index.js:205:73
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async module.exports (evalmachine.<anonymous>:8:1)
    at async /github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:56:13
    at async executeInTempDirectory (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:17:16)
    at async Object.executeRepro (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:24:12)
    at async ExecCommand.execute (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/commands/exec.js:25:38)
    at async ExecCommand.validateAndExecute (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Command.js:161:26)
    at async Cli.run (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Cli.js:74:24)
    at async Cli.runExit (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Cli.js:83:28)

Remember: any non-Jest exceptions will cause the test to be reported as broken. If you expect something to pass without throwing, you must wrap it into something like await expect(...).resolves.toBeTruthy(). If you instead expect something to throw, you need to wrap it into await expect(...).rejects.toThrow().

[merceyz]

Yarn v2 now packs those files correctly since #1574
That project however will be packed with v1 since #1261 which also includes those files