fsaction

Flux Standard Action object creator.

A little shorthand to help creating flux standard action objects.

Installation

npm install fsaction

Usage

import fsaction from 'fsaction';

expect(fsaction('INCREMENT')).to.deep.equal({
	type: 'INCREMENT'
});
expect(fsaction('INCREMENT', 42)).to.deep.equal({
	type: 'INCREMENT',
	payload: 42
});
expect(fsaction('INCREMENT', 42, 'foo')).to.deep.equal({
	type: 'INCREMENT',
	payload: 42,
	meta: 'foo'
});
expect(fsaction('INCREMENT', new Error('foo'))).to.deep.equal({
	type: 'INCREMENT',
	payload: Error<'foo'>,
	error: true
});
expect(fsaction('INCREMENT', (action) => 42, (action) => 'foo'))).to.deep.equal({
	type: 'INCREMENT',
	payload: 42,
	meta: 'foo'
});

API

fsaction(type: string, payload?: any, meta?: any) : object

When payload or meta are functions, they - and any functions they return - will be called until something else than a function is returned.

expect(fsaction('INCREMENT', () => () => () => 42))).to.deep.equal({
	type: 'INCREMENT',
	payload: 42
});

payload or meta functions receive action object as their 1st argument.

payloadCreator(action: object) : payload | payloadCreator

In payload(), this object only has a type property.

In meta(), this object has type, maybe payload, and maybe error properties.

You should treat this object as read only, as that is the resulting FSA object, and modifying it in non-standard way will break FSA compliance.

fsaction.error(type: string, payload?: any, meta?: any) : object

Forces error flag on the resulting action object.

Aliases: fsaction.err(), fsaction.e()

Why not redux-actions?

My actions are usually complex and async, and I prefer them returning a promise instead of an object with promise on its payload property, so combined with redux-thunk and redux-promise I can do stuff like this:

const deleteUser = id => async dispatch => {
	await dispatch(deleteUserData(id));
	return fsaction(DELETE_USER, id);
};

If deleteUserData() was created with redux-actions' createAction(), I'd have to do:

	await dispatch(deleteUserData(id)).payload

which just feels weird to me, and doesn't seem right ™.

In other words, fsaction provides more control over how your actions look like, and how they work. And you can easily use an arrow to replace the redux-actions' createAction():

const payloadCreator = amount => amount;

// redux-actions' `createAction()`
const increment = createAction('INCREMENT', payloadCreator);

// fsaction
const increment = amount => fsaction('INCREMENT', payloadCreator(amount));

License

ISC License (ISC)