fix(core): read stdout and stderr in PackageRegistry.info before waiting for the process to exit

[ghost91-]

Issue for this PR

Fixes #16608
Fixes #10546
Fixes #15673

Type of change

• Bug fix

What does this PR do?

The previous implementation waited for the process to exit first, which resulted in empty stdout and stderr. Subsequently, this caused the PackageRegistry.isOutdated check to always return false and log

Failed to resolve latest version, using cached

Therefore, plugins that were configured to use latest as version were never actually updated.

To fix this, this change ensures stdout and stderr are read while still available. It uses the exact same approach as Process.run.

How did you verify your code works?

I manually tested it with a plugin. I first intentionally installed an older version of the plugin. Then changed it to @latest in the opencode config. Then we can observe in the logs that the new plugin version is automatically installed when running OpenCode:

INFO 2026-03-11T08:35:16 +8ms service=plugin path=opencode-handoff@latest loading plugin
INFO 2026-03-11T08:35:17 +524ms service=bun pkg=opencode-handoff cachedVersion=0.4.0 Cached version is outdated, proceeding with install
INFO 2026-03-11T08:35:17 +0ms service=bun pkg=opencode-handoff version=latest installing package using Bun's default registry resolution
INFO 2026-03-11T08:35:17 +0ms service=bun cmd=["/usr/bin/bun","add","--force","--exact","--no-cache","--cwd","/home/loherj/.cache/opencode","opencode-handoff@latest"] cwd=/home/loherj/.cache/opencode running
INFO 2026-03-11T08:35:17 +293ms service=bun code=0 stdout= stderr= done

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on the search results, I found one potentially related PR:

fix(bun): use direct npm registry fetch for plugin @latest update checks (#16609)

This PR appears related because it addresses similar issues around plugin version checking and @latest updates (PR #16998 fixes issue #16608, which this PR addresses). Both PRs are working on the plugin version update mechanism and the isOutdated check functionality.

However, the current PR (#16998) is the main fix for the root cause (reading stdout/stderr before process exit), while #16609 may be an alternative or related approach. You may want to review these together to ensure they don't conflict.

[unfrgivn]

Confirmed working for me. My plugins that are not pinned are now updating ~/.cache/opencode/package.json to the latest version in the bun registry when restarting Opencode.

[rekram1-node]

same test failures are occuring in dev currently, don't appear to be related.