Add support for root-level version lifecycle

[bigtimebuddy]

Description

This change introduces an optional, root-level postversion script that can be run when publishing. This happens after all per-package postversion scripts have been called.

Motivation and Context

Currently, postversion hooks can only be run per-package. It's useful to have a postversion hook immediately before publishing and after version bumping to rebuild or do anything else which might need to use the updated global version number. In my particular circumstance, I'm using Rollup to build all the packages at the top-level and not relying on lerna run (for performance and memory reasons). While my circumstance is admittedly somewhat specific, the utility of adding a hook here seems pretty generalized.

How Has This Been Tested?

It has been run locally within a project by running lerna publish --skip-npm within a project. This triggers postversion if it's set in the root-level package.json scripts. It has been run with and without the hook and performs as expected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[evocateur]

I like this. I'll add preversion and version calls at the root level, too, because I like the symmetry.

[evocateur]

What I'm thinking, additionally:

diff --git a/src/commands/PublishCommand.js b/src/commands/PublishCommand.js
index f1d3d994..f76c703b 100644
--- a/src/commands/PublishCommand.js
+++ b/src/commands/PublishCommand.js
@@ -570,6 +570,9 @@ export default class PublishCommand extends Command {
     const { exact, conventionalCommits } = this.options;
     const changedFiles = [];
 
+    // exec preversion lifecycle in root (before all updates)
+    this.runSyncScriptInPackage(this.repository.package, "preversion");
+
     this.updates.forEach((update) => {
       const pkg = update.package;
       const packageLocation = pkg.location;
@@ -632,6 +635,9 @@ export default class PublishCommand extends Command {
       }
     }
 
+    // exec version lifecycle in root (after all updates)
+    this.runSyncScriptInPackage(this.repository.package, "version");
+
     if (this.gitEnabled) {
       changedFiles.forEach((file) => GitUtilities.addFile(file, this.execOpts));
     }

[lock]

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