Imagine you have graph layout algorithm, which uses a physical engine. The engine has dozens of configuration options. What do you think is the best way to expose these options?

option1.js

// engine is injected into layout:
var layout = forceBasedLayout(engine);

// Modify global gravity force:
engine.gravity(9.8);
// Modify drag coefficient:
engine.drag(0.1);
// ... you can also chain code above
// engine.gravity(9.8).drag(0.1);

option2.js

// engine is injected into layout:
var layout = forceBasedLayout(engine);

// Modify global gravity force and drag coefficient:
engine.options({
  gravity: 9.8,
  drag: 0.1
});

option3.js

// engine is injected into layout:
var layout = forceBasedLayout(engine);

// Modify global gravity force and drag coefficient:
engine.option('gravity', 9.8);
engine.option('drag', 0.1);