[Bug] Prestart scripts no longer run

• I’d be willing to implement a fix

Describe the bug

In both npm and yarn legacy, when running a script named xxx, if a script named prexxx exists it would be run beforehand. Likewise, a script named postxxx would be run afterwards.

In yarn berry, this is no longer the case; prestart, poststart no longer work for custom script names.

To Reproduce

{
  "name": "test-package",
  "scripts": {
    "prestart": "echo prestart",
    "start": "echo start"
  }
}

Screenshots

npm and yarn 1 work correctly:

yarn berry works incorrectly:

Sherlock repro

await packageJsonAndInstall({
  "scripts": {
    "prestart": "echo prestart",
    "start": "echo start"
  }
});
await expect(await yarn(`start`)).toContain(`prestart`);

[configurator]

This should also be specified in the migration guide, as it is an incredibly large difference from how things used to work, and will break many user scripts.

[arcanis]

Now documented as of #1002