Merge.analysis(repo, their_heads, their_heads_len).then(function(result) {
  // Use result
});

Merge.analysisForRef(repo, our_ref, their_heads, their_heads_len).then(function(result) {
  // Use result
});

Merge.base(repo, one, two).then(function(oid) {
  // Use oid
});

Merge.bases(repo, one, two).then(function(oidarray) {
  // Use oidarray
});

Merge.commits(repo, ourCommit, theirCommit, [options]);

Merge.merge(repo, theirHead, [mergeOpts], [checkoutOpts]);

Merge.trees(repo, ancestor_tree, our_tree, their_tree, opts).then(function(index) {
  // Use index
});