postpack is not called after yarn pack

[thoov]

Bug description

postpack is not called after yarn pack has completed. Also the success message about creating the tarball during yarn pack no longer shows up. This only happens on node 12.16.*

What is the current behavior?

When executing the command yarn pack, yarn invokes the user defined script prepack before packing but does not invoke postpack.

What is the expected behavior?

When executing the command yarn pack, yarn should invoke the user defined script prepack before and postpack after the packaging.

Steps to Reproduce

1. Create a blank project (yarn init)
2. Add the following to package.json

"scripts": {
  "prepack": "echo \"Hello\"",
  "postpack": "echo \"World\""
}

3. Run yarn pack

Expected Output:

yarn pack v1.22.0
$ echo "Hello"
Hello
$ echo "World"
World
success Wrote tarball to "/private/tmp/yarn-test/yarn-test-v1.0.0.tgz".
✨  Done in 0.06s.

Actual Output:

yarn pack v1.22.0
$ echo "Hello"
Hello

Environment

• Node Version: 12.16.0 & 12.16.1
• Yarn v1 Version: 1.22.0
• OS and version: OSX 10.15.3

[thoov]

cc @haochuan

[stefanpenner]

This issue appears to continue into node@^14

[merceyz]

Fixed in v2

https://yarnpkg.com/getting-started/migration