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export default function visit(vertex, fn, visited, path) { var name = vertex.name; var vertices = vertex.incoming; var names = vertex.incomingNames; var len = names.length; var i; if (!visited) { visited = {}; } if (!path) { path = []; } if (visited.hasOwnProperty(name)) { return; } path.push(name); visited[name] = true; for (i = 0; i < len; i++) { visit(vertices[names[i]], fn, visited, path); } fn(vertex, path); path.pop(); }