I have a value that comes from a select input and is of type string, however I want to pass it into a function (updateLanguage) that receives as argument a string enum with a type alias (Language).   The problem I'm facing is that Flow only allow...

Let's say I have this function (try online):  type Person = { name: string } function getName(p: ?Person): ?string {   if (!p) {     return p   } else {     return p.name   } }  const frank: Person = { name: 'Frank' } /*  * In order to wo...

I'm trying to type the redux store like this : const s:Store<S,A>=createStore (todoApp) but I get   identifier Store ... Could not resolve name flow error  any idea how to fix this ?   I am using this flow typed declarations:  // flow-typed...

I get this error when running flow check, but I'm not sure what it means.     Cannot use exports as a type because exports is a value. To get the type of a value use typeof.   The error location is 0:1 (at the @flow comment). Here's the code:...

Here's a boiled down example that fail with the error  assignment of computed property/element. Indexable signature not found  Surely flow can read the types and strings in the methods array. Why is it complaining?...

I have defined a custom Flow type  export type MyType = {   code: number,   type: number = 1, }   I want the type parameter to default as 1 if no value is present. However, Flow is complaining with Unexpected token =.    Can this be done with Flow?...

In the following code (Try Flow):  type Response = {     err: ?string;     data: Object; } function length(x): Response {   return { data : {} }; }  length(10)   I made err optional, but still get an error:     Property err not found in object litera...

I have a project that uses the convo GraphQL, Relay and Flow. Is there a way to use GraphQL schema to feed Flow so the React props can be typed without redeclaring the types?   For Relay I'm already using the script that generates two files: sche...

This doesn't compile on the "Try Flow":  /* @flow */  type A = { a: number, b: string}; type B = { a: string, b: string };  const x: A = { a:1, b:'2' }; const y: B = { ...x, a: x.a.toString() }   Error is:  const y: B = { ...x, a:...

Given a website object created like this   import {Map} from 'immutable'  const website = new Map({name: 'My Website', url: 'http://www.myw.fr'})   How could I declare a websiteType which would be a map containing exactly the...