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async-settle

async-settle

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Settle an async function. It will always complete successfully with an object of the resulting state.

Handles completion and errors for callbacks, promises, observables and streams.

Will run call the function on nextTick. This will cause all functions to be async.

Usage

Successful completion

var asyncSettle = require('async-settle');
 
asyncSettle(function(done){
  // do async things 
  done(null, 2);
}, function(error, result){
  // `error` will ALWAYS be null on execution of the first function. 
  // `result` will ALWAYS be a settled object with the result or error of the first function. 
});

Failed completion

var asyncSettle = require('async-settle');
 
asyncSettle(function(done){
  // do async things 
  done(new Error('Some Error Occurred'));
}, function(error, result){
  // `error` will ALWAYS be null on execution of the first function. 
  // `result` will ALWAYS be a settled object with the result or error of the first function. 
});

API

asyncSettle(fn, callback)

Takes a function to execute (fn) and a function to call on completion (callback).

fn([done])

Optionally takes a callback (done) to call when async tasks are complete.

Executed in the context of async-done, with all errors and results being settled.

Completion is handled by async-done completion and error resolution.

callback(error, result)

Called on completion of fn and recieves a settled object as the result argument.

The error argument will always be null.

Settled Object

Settled values have two properties, state and value.

state has two possible options 'error' and 'success'.

value will be the value passed to original callback.

License

MIT