Require state to be a record

Fixes #19

Author: maddie927

Diff for: examples/component/src/Container.purs

@@ -2,16 +2,14 @@ module Container where
 
 import Prelude
 
-import React.Basic (ReactComponent, createElement, react)
+import React.Basic (ReactComponent, createElement, stateless)
 import React.Basic.DOM as R
 import ToggleButton as ToggleButton
 
 component :: ReactComponent Unit
-component = react
+component = stateless
   { displayName: "Container"
-  , initialState: unit
-  , receiveProps: \_ _ _ -> pure unit
-  , render: \_ _ setState ->
+  , render: \_ ->
       R.div { children: [ createElement ToggleButton.component { on: true }
                         , createElement ToggleButton.component { on: false }
                         ]

Diff for: generated-docs/React/Basic.md

@@ -3,7 +3,7 @@
 #### `react`
 
 ``` purescript
-react :: forall props state fx. { displayName :: String, initialState :: state, receiveProps :: props -> state -> (SetState state fx) -> Eff (react :: ReactFX | fx) Unit, render :: props -> state -> (SetState state fx) -> JSX } -> ReactComponent props
+react :: forall props state fx. { displayName :: String, initialState :: {  | state }, receiveProps :: props -> {  | state } -> (SetState state fx) -> Eff (react :: ReactFX | fx) Unit, render :: props -> {  | state } -> (SetState state fx) -> JSX } -> ReactComponent props
 ```
 
 Create a React component from a _specification_ of that component.

Diff for: src/React/Basic.purs

@@ -28,9 +28,9 @@ import React.Basic.Types as React.Basic.Types
 react
   :: forall props state fx
    . { displayName :: String
-     , initialState :: state
-     , receiveProps :: props -> state -> (SetState state fx) -> Eff (react :: ReactFX | fx) Unit
-     , render :: props -> state -> (SetState state fx) -> JSX
+     , initialState :: { | state }
+     , receiveProps :: props -> { | state } -> (SetState state fx) -> Eff (react :: ReactFX | fx) Unit
+     , render :: props -> { | state } -> (SetState state fx) -> JSX
      }
   -> ReactComponent props
 react { displayName, initialState, receiveProps, render } =
@@ -54,13 +54,13 @@ stateless
 stateless { displayName, render } =
   react
     { displayName
-    , initialState: unit
+    , initialState: {}
     , receiveProps: \_ _ _ -> pure unit
     , render: \props _ _ -> render props
     }
 
 -- | SetState uses an update function to modify the current state.
-type SetState state fx = (state -> state) -> Eff (react :: ReactFX | fx) Unit
+type SetState state fx = ({ | state } -> { | state }) -> Eff (react :: ReactFX | fx) Unit
 
 -- | Create a `JSX` node from a React component, by providing the props.
 createElement
@@ -94,9 +94,9 @@ fragmentKeyed = runFn2 fragmentKeyed_
 foreign import component_
   :: forall props state fx
    . { displayName :: String
-     , initialState :: state
-     , receiveProps :: EffFn3 (react :: ReactFX | fx) props state (SetState state fx) Unit
-     , render :: Fn3 props state (SetState state fx) JSX
+     , initialState :: { | state }
+     , receiveProps :: EffFn3 (react :: ReactFX | fx) props { | state } (SetState state fx) Unit
+     , render :: Fn3 props { | state } (SetState state fx) JSX
      }
   -> ReactComponent props