f8app | Source code of the official F8 app | Frontend Framework library
kandi X-RAY | f8app Summary
kandi X-RAY | f8app Summary
Source code of the official F8 app of 2017, powered by React Native and other Facebook open source projects.
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QUESTION
The following function exists in Facebook's open source F8 Application
...ANSWER
Answered 2018-Apr-15 at 20:09This is Flow syntax signifying that configureStore
takes an optional callback parameter onComplete
, that can be null
.
However, the // @flow
annotation is missing in this file. Files using Flow type checking should include this annotation at the top of the file before any code.
There are two parts to this annotation:
1. () => void
denotes a Flow Function type. In the above case, the onComplete
parameter is a function with no arguments and return type void
.
2. ?
denotes a Maybe type. In the above case, onComplete
is an optional parameter.
Maybe types accept the provided type as well as
null
orundefined
.
Note: order matters. If ?
was instead before :
, (ie: onComplete?:
), then the function would accept the provided type and undefined
, but not null
.
Reference:
QUESTION
Following the style of this Facebook app sample using Redux and Flow together, I made an action type in this manner:
...ANSWER
Answered 2018-Aug-09 at 18:15This is simply a case of a type refinement invalidation:
https://flow.org/en/docs/lang/refinements/#toc-refinement-invalidations
Because you are using the value in a callback, Flow pessimistically assumes that you could have re-assigned action
before the callback runs (it does not know that the map
callback is called immediately). It also does not do the analysis to see that there is no place, in fact, that you re-assign it.
All that's needed is to pull the action
out as a const
:
QUESTION
I've started working with React-Native and run iOS. I'm creating an app based on f8App that is shared in github, but upgrading to the latest dependencies.
I'm also using Redux in order to run this app. The initial goal in this case is to load the Login page which will use firebase Auth.
Below is the setup.js
:
ANSWER
Answered 2017-Jul-12 at 07:42You have configureStore
exported as default
. Replace:
QUESTION
In the below code snippet from F8App, I am not able to understand what is going on, can someone explain what's going on in line 3 of code and point to resources on the web where I can read about this.
...ANSWER
Answered 2017-May-04 at 15:40I think you are having trouble with the type checking
that's added. That's actually not es6 but flow
. You can read more about it here
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