Flow types: intersecting inexact shape types is too buggy, causes errors in userland with more recent versions of flow

Let me know if you want a PR...I think we need to investigate workarounds before we proceed...

I'm getting errors like this:

Error ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ src/universal/components/CalibrationForm/index.js:119:10

Cannot create FieldArray element because property defaultValue is missing in object type [1] but exists in props [2].

     src/universal/components/CalibrationForm/index.js
     116│
     117│     if (isInCalibration) {
     118│       return (
 [2] 119│         <FieldArray
     120│           name="points"
     121│           key={numPoints + 1}
     122│           validate={validatePoints}
     123│           render={props => (
     124│             <CalibrationTable
     125│               {...props}
     126│               units={units}
     127│               rawInputUnits={rawInputUnits}
     128│               bodyClass={classes.body}
     129│             />
     130│           )}
     131│         />

     node_modules/react-final-form-arrays/dist/types.js.flow
 [1]  43│ export type RenderableProps<T> = $Shape<{
      44│   children: (props: T) => React.Node,
      45│   component: React.ComponentType<*>,
      46│   render: (props: T) => React.Node
      47│ }>

Problem is here:

react-final-form-arrays/src/types.js.flow

Line 57 in 16f19c5

export type FieldArrayProps = { name: string } & UseFieldArrayConfig &

Intersecting inexact shape types in Flow has always caused problems like this sporadically.

It seems like this appears to work, though I don't trust it until I've played with it more:

type FieldArrayProps = { name: string, ...$Exact<UseFieldArrayConfig>, ...$Exact<RenderableProps<FieldArrayProps>> }

I don't trust it until I've played with it more though, because I remember seeing inexact spreads like { name: string, ...UseFieldArrayConfig } produce buggy errors (facebook/flow#1326 (comment)).

It's reproducible in try flow:

https://flow.org/try/#0PTAEAEDMBsHsHcBQBLAtgB1gJwC6gFSgCGAzqAEoCmRAxnpFrKqAORbV0uI4Ce6loAGLJK0ACYBlAK4AjEjSzJ0OZLAB2oALygA3gG0SORWoDmAXQBcoGbFjRqagL6IQoQ7JmUxb5GpoCASVAaIjUWPDRMXFAGJhjfImgAWkhsZgALSnZuPgFhUUkcIhwBbR0AHwA3ROQxKxs7B3LnHP5QAFlKIq1QABIJdKJ+AB4dRFBiOmRKygB+ett7UIAacdAxYqJ50AB5GQArSjpVibFkXB5thqW1E-Xz3glffwAZUhxpGVRkHCvFhzuWUYWG2oR4d18P2QiVBanBa181WgtT+jRWa3sphw6W2aikqE8WDuqFgZ0gIjEqJud3QikMvjmCzRtzWJFk3xwAFEsMDYfCJmyvj9BERkPZKUzqaz2T9pDR-F4vFSAdKhTgVKZleiJjhYFIaJkJdZ-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-rox1mNswATANaxgSekGmNFbniJ570lX5nNddzWBs4FHBVZF0XpfFai-FYlWpYbmXZbl+UmYVKu81Y6uhpr2sVbr4X66q02jeoE0i1NCgzWN82UIty1rZ9W0IjtKh7ZHR2Mba52XdA703f9cLPg9JostaL3FIyqFKd9v3-dAgOfSDBxHDgdYVkUUMwwX8OIy0MXifQtiOyL1NY7zUt4+BrCpLALB1hMSPt4YMS2OL3cFL3EsDzLVgsCPY-ps6QA

Also the $Shape around Meta is unnecessary since all properties in it are optional anyway

The solution for me was to downgrade from 3.1.3 to 3.1.1
Please take care about it so in future we can use the newest versions.