backport/dist/src/lib/get-source-branch-from-commits.js

A CLI tool that automates the process of backporting commits

export function getSourceBranchFromCommits(commits) {
    // sourceBranch should be the same for all commits, so picking `sourceBranch` from the first commit should be fine 🤞
    // this is specifically needed when backporting a PR like `backport --pr 123` and the source PR was merged to a non-default (aka non-master) branch.
    const firstCommit = commits.at(0);
    if (!firstCommit) {
        throw new Error('Expected at least one commit');
    }
    return firstCommit.sourceBranch;
}
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