Diff.blobToBuffer(old_blob, old_as_path, buffer, buffer_as_path, opts, file_cb, binary_cb, hunk_cb, line_cb).then(function() {
  // method complete});

Diff.fromBuffer(content, content_len).then(function(diff) {
  // Use diff
});

Diff.indexToIndex(repo, old_index, new_index, opts).then(function(diff) {
  // Use diff
});

Diff.indexToWorkdir(repo, index, opts).then(function(diff) {
  // Use diff
});

Diff.treeToIndex(repo, old_tree, index, opts).then(function(diff) {
  // Use diff
});

Diff.treeToTree(repo, old_tree, new_tree, opts).then(function(diff) {
  // Use diff
});

Diff.treeToWorkdir(repo, old_tree, opts).then(function(diff) {
  // Use diff
});

Diff.treeToWorkdirWithIndex(repo, old_tree, opts).then(function(diff) {
  // Use diff
});

diff.findSimilar(options).then(function(result) {
  // Use result
});

var diffDelta = diff.getDelta(idx);

var diffPerfdata = diff.getPerfdata();

diff.getStats().then(function(diffStats) {
  // Use diffStats
});

var result = diff.isSortedIcase();

diff.merge(from).then(function(result) {
  // Use result
});

var result = diff.numDeltas();

diff.patches().then(function(arrayConvenientPatch) {
  // Use arrayConvenientPatch
});

diff.patchid(opts).then(function(oid) {
  // Use oid
});

diff.toBuf(format).then(function(buf) {
  // Use buf
});