GitHub Introduces Stacked Pull Requests: Split Massive Code Reviews Into Manageable Chunks.

GitHub Rolls Out Stacked Pull Requests Preview to Streamline Complex Code Reviews

GitHub has officially introduced its Stacked Pull Requests feature in public preview, enabling developers to split large codebases or multi-stage features into a series of smaller, sequential Pull Requests (PRs). This approach allows reviewers to examine code changes incrementally rather than processing massive, monolithic PRs at once, while giving project maintainers the flexibility to merge individual parts of a stack independently.

The feature spent several months in a closed testing phase with select open-source projects and enterprise teams. Developers working on high-profile projects like Next.js were early adopters, noting that stacking made reviewing large architectural updates significantly more manageable.

Despite the workflow improvements, GitHub acknowledged that the preview version still has minor edge cases and bugs. For instance, if an earlier PR in a stack is merged using a squash merge, downstream dependent PRs may lose their commit history reference, requiring authors to manually rebase or request a secondary review on subsequent changes.

Stacked Pull Requests are currently rolling out in public preview status and will gradually become available across all repositories over the coming weeks.

Changing the philosophy of code review: Large pull requests (mega-PRs) are often left unreviewed for weeks because reviewers can't handle thousands of lines of code changes. Breaking features down into logical workflows (e.g., database migration → backend API → frontend UI) allows reviewers to approve and integrate the underlying layers while lower layers continue to be improved.

PR cascading has long been a key part of the software engineering culture at tech giants like Meta (using internal tools like Phabricator) and Google (using Critique). External CLI tools like gt (Graphite) or spr have previously attempted to bridge this gap on GitHub. Bringing native PR cascading support directly to GitHub's web UI would democratize the enterprise code review workflow for open-source maintainers and smaller engineering teams.

 

Source: GitHub 

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GitHub Rolls Out Stacked Pull Requests Preview to Streamline Complex Code Reviews

GitHub has officially introduced its Stacked Pull Requests feature in public preview, enabling developers to split large codebases or multi-stage features into a series of smaller, sequential Pull Requests (PRs). This approach allows reviewers to examine code changes incrementally rather than processing massive, monolithic PRs at once, while giving project maintainers the flexibility to merge individual parts of a stack independently.

The feature spent several months in a closed testing phase with select open-source projects and enterprise teams. Developers working on high-profile projects like Next.js were early adopters, noting that stacking made reviewing large architectural updates significantly more manageable.

Despite the workflow improvements, GitHub acknowledged that the preview version still has minor edge cases and bugs. For instance, if an earlier PR in a stack is merged using a squash merge, downstream dependent PRs may lose their commit history reference, requiring authors to manually rebase or request a secondary review on subsequent changes.

Stacked Pull Requests are currently rolling out in public preview status and will gradually become available across all repositories over the coming weeks.

Changing the philosophy of code review: Large pull requests (mega-PRs) are often left unreviewed for weeks because reviewers can't handle thousands of lines of code changes. Breaking features down into logical workflows (e.g., database migration → backend API → frontend UI) allows reviewers to approve and integrate the underlying layers while lower layers continue to be improved.

PR cascading has long been a key part of the software engineering culture at tech giants like Meta (using internal tools like Phabricator) and Google (using Critique). External CLI tools like gt (Graphite) or spr have previously attempted to bridge this gap on GitHub. Bringing native PR cascading support directly to GitHub's web UI would democratize the enterprise code review workflow for open-source maintainers and smaller engineering teams.

 

Source: GitHub