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test_voodoo.js
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test_voodoo.js
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/* globals $Exact, $PropertyType */
/* eslint-disable no-unused-vars, no-unused-expressions, arrow-body-style */
/* @flow */
import React from 'react'
import {
compose,
withProps,
flattenProp,
renameProp,
renameProps,
withState,
} from '../..'
import type { HOC } from '../..'
type EnhancedCompProps = {
eA: number,
obj: { objPropA: string, objPropB: number },
}
const Comp = ({ eA, objPropA }) =>
<div>
{(eA: number)}
{(objPropA: string)}
{
// $ExpectError eA nor any nor string
(eA: string)
}
{
// $ExpectError eA nor any nor string
(objPropA: number)
}
</div>
const Comp2 = ({ eA, objPropA }) =>
<div>
{/* hack to preview types */}
{/* :: eA, objPropA */}
</div>
const flattenEnhacer: HOC<*, EnhancedCompProps> = compose(
(flattenProp('obj'): HOC<
{
...$Exact<EnhancedCompProps>,
...$Exact<$PropertyType<EnhancedCompProps, 'obj'>>,
},
EnhancedCompProps
>),
withProps(props => ({
eA: (props.eA: number),
// $ExpectError
eB: (props.eA: string),
}))
)
const EnhancedComponent = flattenEnhacer(Comp)
const EnhancedComponent2 = flattenEnhacer(Comp2)
// renameEnhacer voodoo (you don't need it, use withProps instead)
const RenameComp = ({ eA, objNew, obj }) =>
<div>
{(eA: number)}
{
// objNew has a type we need
(objNew.objPropA: string)
}
{
// $ExpectError eA nor any nor string
(eA: string)
}
{
// $ExpectError eA nor any nor string
(objNew.objPropA: number)
}
{
// obj is null
(obj: null)
}
{
// $ExpectError eA nor any nor string
(obj: string)
}
</div>
const renameEnhacer: HOC<*, EnhancedCompProps> = compose(
(renameProp('obj', 'objNew'): HOC<
{
...$Exact<EnhancedCompProps>,
...$Exact<{ obj: null }>,
// $PropertyType does not work here
...$Exact<{ objNew: { objPropA: string, objPropB: number } }>,
},
EnhancedCompProps
>),
withProps(props => ({
eA: (props.eA: number),
// $ExpectError
eB: (props.eA: string),
}))
)
renameEnhacer(RenameComp)
const renamePropsEnhacer: HOC<*, EnhancedCompProps> = compose(
(renameProps({ obj: 'objNew' }): HOC<
{
...$Exact<EnhancedCompProps>,
// --- repeat for every key ---
...$Exact<{ obj: null }>,
// $PropertyType does not work here
...$Exact<{ objNew: { objPropA: string, objPropB: number } }>,
},
EnhancedCompProps
>),
withProps(props => ({
eA: (props.eA: number),
// $ExpectError
eB: (props.eA: string),
}))
)
// use withStateHandlers instead
const withStateEnhancer: HOC<*, EnhancedCompProps> = compose(
(withState('a', 'setA', { hello: 'world' }): HOC<
{
...$Exact<EnhancedCompProps>,
...$Exact<{ a: { hello: string }, setA: (a: { hello: string }) => void }>,
},
EnhancedCompProps
>),
withProps(props => ({
eA: (props.eA: number),
// $ExpectError
eB: (props.eA: string),
}))
)
// withReducer see withState above
// lifecycle see withState above