pdi

PDI - Minimal Promise based Dependency Injection framework

Simple API:

• pdi.add(name, deps, fn) Adds a module by name and with depedencies
• pdi.start(deps, fn)
• pdi.clear used when testing to reset the DI

Extra utils for testing:

• pdi._test.clear()
• pdi._test.

While being small this library is powerful enough to be used for async flow control, for example:

const flow = pdi()
flow.add("body", req.body)
flow.add("userId", ["body"], prop("userId"))
flow.add("user", ["userId"], getUser)
flow.add("friends", ["user"], getFriends)
flow.add("result", ["friends", "user"], assoc("friends"))
flow.start(["result"])
.then((result) => res.send(result))
.catch((err) => res.sendStatus(500))