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June 5, 2018 21:26
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Broken ReasonReact component
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/src/ui-re/src/PageHeader.re 8:17-58 | |
6 _ | Select('a); | |
7 _ | |
8 _ let component = ReasonReact.reducerComponent("PageHeader"); | |
9 _ | |
10 _ let make = (~orgName, ~productName, ~tabs : list(('a, string)), ~onTab | |
Change : ('a => unit), _children) => { | |
This expression's type contains type variables that can't be generalized: | |
ReasonReact.componentSpec(state('_a), ReasonReact.stateless, | |
ReasonReact.noRetainedProps, | |
ReasonReact.noRetainedProps, action('_a)) | |
This happens when the type system senses there's a mutation/side-effect, | |
in combination with a polymorphic value. | |
Using or annotating that value usually solves it. More info: | |
https://realworldocaml.org/v1/en/html/imperative-programming-1.html#side-effects-and-weak-polymorphism | |
ninja: build stopped: subcommand failed. | |
>>>> Finish compiling(exit: 1) | |
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[%bs.raw {|require('./Header.css')|}]; | |
type state('a) = {selected: 'a}; | |
type action('a) = | |
| Select('a); | |
let component = ReasonReact.reducerComponent("PageHeader"); | |
let make = (~orgName, ~productName, ~tabs : list(('a, string)), ~onTabChange : ('a => unit), _children) => { | |
...component, | |
initialState: () => {selected: (tabs |> List.hd |> fst)}, | |
reducer: (action, state) => | |
switch(action) { | |
| Select(a) => ReasonReact.UpdateWithSideEffects({selected: a}, self => onTabChange(self.state.selected)) | |
}, | |
render: self => { | |
<nav className="bx--cloud-header"> | |
<div className="bx--cloud-header__wrapper"> | |
<button className="bx--cloud-header__app-menu" type_="button"> | |
<svg width="20" height="20" viewBox="0 0 20 20"> | |
<path d="M3 4h14v1H3zm0 6h14v1H3zm0 6h14v1H3z"></path> | |
</svg> | |
</button> | |
<a href="#" className="bx--cloud-header-brand"> | |
<h4 className="bx--cloud-header-brand__text"> | |
(ReasonReact.string(orgName ++ " ")) | |
<span> | |
(ReasonReact.string(productName)) | |
</span> | |
</h4> | |
</a> | |
<ul className="bx--cloud-header-list"> | |
<li className="bx--cloud-header-list__item"> | |
(ReasonReact.array( | |
Array.of_list(List.map(((a, l)) => | |
<a className="bx--cloud-header-list__link" | |
href="#" key=l | |
onClick=(_e => self.ReasonReact.send(Select(a)) )> | |
(ReasonReact.string(l)) | |
</a>, tabs)))) | |
</li> | |
</ul> | |
</div> | |
</nav> | |
}, | |
}; |
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