react native and flow error messages

问题:

Hi I was trying to do some hello world with React Native. I created project 'react-native init' change the flow version in '.flowconfig'.

Ran flow and it gave me 153 errors which are in the node_modules folder like node_modules/react-native/Libraries

Does any one happen have this same problem?

回答1:

I ran into very same problem. You need to do two steps:

1. Compare your .flowconfig with this file and add the lines that you're missing:

[ignore]
; We fork some components by platform
.*/*[.]android.js

; Ignore "BUCK" generated dirs
<PROJECT_ROOT>/\.buckd/

; Ignore unexpected extra "@providesModule"
.*/node_modules/.*/node_modules/fbjs/.*

; Ignore duplicate module providers
; For RN Apps installed via npm, "Libraries" folder is inside
; "node_modules/react-native" but in the source repo it is in the root
.*/Libraries/react-native/React.js
.*/Libraries/react-native/ReactNative.js

<PROJECT_ROOT>/node_modules/.*
<PROJECT_ROOT>/libdefs.js
.*/__tests__/.*

[include]

[libs]
node_modules/react-native/Libraries/react-native/react-native-interface.js
node_modules/react-native/flow
./libdefs.js

2. create libdefs.js into root folder. It should look something like this:

declare module 'react-native' { declare var exports: any; }
declare module 'jest' { declare var exports: any; }

Plus, declare all the modules flow throws errors about (e.g. 'mobx' -- I know this can be a bit frustrating, but it has to be done)

回答2:

Found this issue which recommended updating the flowconfig to use the latest version from create-react-native-app. Seems to have worked for me.