Flow requires type annotation of props in HOC












2














I'm struggling with types of injected props by HOC.



It's just simple, in App Component, there are two props: title and message.



However title is provided by HOC.



Here's the code for this:



/* @flow */
import React, { Component } from 'react';
import type { ComponentType } from 'react';

interface AppProps {
title: string;
message: string;
}

class App extends Component<AppProps, {}> {
static defaultProps = {
message: 'Helloworld'
}
render() {
return (
<div>
<div>Title: {this.props.title}</div>
<div>Message: {this.props.message}</div>
</div>
);
}
}

function injectProp<Props: {}>(
Component: ComponentType<{ title: string } & Props>
): ComponentType<Props> {
return function EnhancedComponent(props: Props) {
return <Component title="Hello" {...props} />;
}
};

export default injectProp(App);


It seems fine, however when I run the flow, it fails with




Missing type annotation for Props.



32| export default injectProp(App);




So I tried this, but no luck:



export default injectProp<AppProps>(App);


Now I got bunch of error messages.



> babel-react-webpack-flow-boilerplate@1.0.0 flow F:devwebproptype-test
> flow

Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:16

Cannot compare boolean [1] to statics of `App` [2].

src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^ [1]

References:
src/js/components/App.js:10:7
10| class App extends Component<AppProps, {}> {

^^^ [2]


Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:27

Cannot reference type `AppProps` [1] from a value position.

src/js/components/App.js:32:27
32| export default injectProp<AppProps>(App);

^^^^^^^^

References:
src/js/components/App.js:5:11
5| interface AppProps {

^^^^^^^^ [1]


Error --------------------------------------------------------------------------------------------- src/js/index.js:17:1

Cannot call `ReactDOM.render` because boolean [1] is not a React component.

src/js/index.js:17:1
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot call `ReactDOM.render` with `<App />` bound to `element` because boolean [1] is incompatible with string [2] in
type argument `ElementType` [3].

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:159:5
159| | string

^^^^^^ [2]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:167:29
167| declare type React$Element<+ElementType: React$ElementType> = {|

^^^^^^^^^^^ [3]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot create `App` element because boolean [1] is not a React component.

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]



Found 5 errors

Only showing the most relevant union/intersection branches.
To see all branches, re-run Flow with --show-all-branches


Using flow-bin@0.69.0 and React@16.3.0. What am I missing? Why keep Flow complains about type annotation that doesn't needed?










share|improve this question
























  • how do you import App into index.js?
    – Alex
    Nov 25 at 19:28










  • @Alex I just import App from 'App'; something like this.
    – modernator
    Nov 26 at 15:03
















2














I'm struggling with types of injected props by HOC.



It's just simple, in App Component, there are two props: title and message.



However title is provided by HOC.



Here's the code for this:



/* @flow */
import React, { Component } from 'react';
import type { ComponentType } from 'react';

interface AppProps {
title: string;
message: string;
}

class App extends Component<AppProps, {}> {
static defaultProps = {
message: 'Helloworld'
}
render() {
return (
<div>
<div>Title: {this.props.title}</div>
<div>Message: {this.props.message}</div>
</div>
);
}
}

function injectProp<Props: {}>(
Component: ComponentType<{ title: string } & Props>
): ComponentType<Props> {
return function EnhancedComponent(props: Props) {
return <Component title="Hello" {...props} />;
}
};

export default injectProp(App);


It seems fine, however when I run the flow, it fails with




Missing type annotation for Props.



32| export default injectProp(App);




So I tried this, but no luck:



export default injectProp<AppProps>(App);


Now I got bunch of error messages.



> babel-react-webpack-flow-boilerplate@1.0.0 flow F:devwebproptype-test
> flow

Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:16

Cannot compare boolean [1] to statics of `App` [2].

src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^ [1]

References:
src/js/components/App.js:10:7
10| class App extends Component<AppProps, {}> {

^^^ [2]


Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:27

Cannot reference type `AppProps` [1] from a value position.

src/js/components/App.js:32:27
32| export default injectProp<AppProps>(App);

^^^^^^^^

References:
src/js/components/App.js:5:11
5| interface AppProps {

^^^^^^^^ [1]


Error --------------------------------------------------------------------------------------------- src/js/index.js:17:1

Cannot call `ReactDOM.render` because boolean [1] is not a React component.

src/js/index.js:17:1
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot call `ReactDOM.render` with `<App />` bound to `element` because boolean [1] is incompatible with string [2] in
type argument `ElementType` [3].

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:159:5
159| | string

^^^^^^ [2]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:167:29
167| declare type React$Element<+ElementType: React$ElementType> = {|

^^^^^^^^^^^ [3]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot create `App` element because boolean [1] is not a React component.

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]



Found 5 errors

Only showing the most relevant union/intersection branches.
To see all branches, re-run Flow with --show-all-branches


Using flow-bin@0.69.0 and React@16.3.0. What am I missing? Why keep Flow complains about type annotation that doesn't needed?










share|improve this question
























  • how do you import App into index.js?
    – Alex
    Nov 25 at 19:28










  • @Alex I just import App from 'App'; something like this.
    – modernator
    Nov 26 at 15:03














2












2








2







I'm struggling with types of injected props by HOC.



It's just simple, in App Component, there are two props: title and message.



However title is provided by HOC.



Here's the code for this:



/* @flow */
import React, { Component } from 'react';
import type { ComponentType } from 'react';

interface AppProps {
title: string;
message: string;
}

class App extends Component<AppProps, {}> {
static defaultProps = {
message: 'Helloworld'
}
render() {
return (
<div>
<div>Title: {this.props.title}</div>
<div>Message: {this.props.message}</div>
</div>
);
}
}

function injectProp<Props: {}>(
Component: ComponentType<{ title: string } & Props>
): ComponentType<Props> {
return function EnhancedComponent(props: Props) {
return <Component title="Hello" {...props} />;
}
};

export default injectProp(App);


It seems fine, however when I run the flow, it fails with




Missing type annotation for Props.



32| export default injectProp(App);




So I tried this, but no luck:



export default injectProp<AppProps>(App);


Now I got bunch of error messages.



> babel-react-webpack-flow-boilerplate@1.0.0 flow F:devwebproptype-test
> flow

Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:16

Cannot compare boolean [1] to statics of `App` [2].

src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^ [1]

References:
src/js/components/App.js:10:7
10| class App extends Component<AppProps, {}> {

^^^ [2]


Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:27

Cannot reference type `AppProps` [1] from a value position.

src/js/components/App.js:32:27
32| export default injectProp<AppProps>(App);

^^^^^^^^

References:
src/js/components/App.js:5:11
5| interface AppProps {

^^^^^^^^ [1]


Error --------------------------------------------------------------------------------------------- src/js/index.js:17:1

Cannot call `ReactDOM.render` because boolean [1] is not a React component.

src/js/index.js:17:1
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot call `ReactDOM.render` with `<App />` bound to `element` because boolean [1] is incompatible with string [2] in
type argument `ElementType` [3].

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:159:5
159| | string

^^^^^^ [2]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:167:29
167| declare type React$Element<+ElementType: React$ElementType> = {|

^^^^^^^^^^^ [3]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot create `App` element because boolean [1] is not a React component.

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]



Found 5 errors

Only showing the most relevant union/intersection branches.
To see all branches, re-run Flow with --show-all-branches


Using flow-bin@0.69.0 and React@16.3.0. What am I missing? Why keep Flow complains about type annotation that doesn't needed?










share|improve this question















I'm struggling with types of injected props by HOC.



It's just simple, in App Component, there are two props: title and message.



However title is provided by HOC.



Here's the code for this:



/* @flow */
import React, { Component } from 'react';
import type { ComponentType } from 'react';

interface AppProps {
title: string;
message: string;
}

class App extends Component<AppProps, {}> {
static defaultProps = {
message: 'Helloworld'
}
render() {
return (
<div>
<div>Title: {this.props.title}</div>
<div>Message: {this.props.message}</div>
</div>
);
}
}

function injectProp<Props: {}>(
Component: ComponentType<{ title: string } & Props>
): ComponentType<Props> {
return function EnhancedComponent(props: Props) {
return <Component title="Hello" {...props} />;
}
};

export default injectProp(App);


It seems fine, however when I run the flow, it fails with




Missing type annotation for Props.



32| export default injectProp(App);




So I tried this, but no luck:



export default injectProp<AppProps>(App);


Now I got bunch of error messages.



> babel-react-webpack-flow-boilerplate@1.0.0 flow F:devwebproptype-test
> flow

Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:16

Cannot compare boolean [1] to statics of `App` [2].

src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^ [1]

References:
src/js/components/App.js:10:7
10| class App extends Component<AppProps, {}> {

^^^ [2]


Error ----------------------------------------------------------------------------------- src/js/components/App.js:32:27

Cannot reference type `AppProps` [1] from a value position.

src/js/components/App.js:32:27
32| export default injectProp<AppProps>(App);

^^^^^^^^

References:
src/js/components/App.js:5:11
5| interface AppProps {

^^^^^^^^ [1]


Error --------------------------------------------------------------------------------------------- src/js/index.js:17:1

Cannot call `ReactDOM.render` because boolean [1] is not a React component.

src/js/index.js:17:1
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot call `ReactDOM.render` with `<App />` bound to `element` because boolean [1] is incompatible with string [2] in
type argument `ElementType` [3].

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:159:5
159| | string

^^^^^^ [2]
C:UsersUserAppDataLocalTempflowflowlib_6db8195react.js:167:29
167| declare type React$Element<+ElementType: React$ElementType> = {|

^^^^^^^^^^^ [3]


Error -------------------------------------------------------------------------------------------- src/js/index.js:17:17

Cannot create `App` element because boolean [1] is not a React component.

src/js/index.js:17:17
17| ReactDOM.render(<App message="A" />, entryEl);

^^^^^^^^^^^^^^^^^^^

References:
src/js/components/App.js:32:16
32| export default injectProp<AppProps>(App);

^^^^^^^^^^^^^^^^^^^^^^^^^ [1]



Found 5 errors

Only showing the most relevant union/intersection branches.
To see all branches, re-run Flow with --show-all-branches


Using flow-bin@0.69.0 and React@16.3.0. What am I missing? Why keep Flow complains about type annotation that doesn't needed?







reactjs flowtype high-order-component






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 25 at 19:29









Alex

3,195621




3,195621










asked Nov 22 at 17:22









modernator

1,24432448




1,24432448












  • how do you import App into index.js?
    – Alex
    Nov 25 at 19:28










  • @Alex I just import App from 'App'; something like this.
    – modernator
    Nov 26 at 15:03


















  • how do you import App into index.js?
    – Alex
    Nov 25 at 19:28










  • @Alex I just import App from 'App'; something like this.
    – modernator
    Nov 26 at 15:03
















how do you import App into index.js?
– Alex
Nov 25 at 19:28




how do you import App into index.js?
– Alex
Nov 25 at 19:28












@Alex I just import App from 'App'; something like this.
– modernator
Nov 26 at 15:03




@Alex I just import App from 'App'; something like this.
– modernator
Nov 26 at 15:03












1 Answer
1






active

oldest

votes


















0














This problem will resolve by export module like this:



export default injectProp<AppProps>(App);


And update to latest version(0.86.0) will works.



I made repo for this:
https://github.com/rico345100/hoc-prop-types-test



Might be helpful to people who has same issue like me.






share|improve this answer





















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    1 Answer
    1






    active

    oldest

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    active

    oldest

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    active

    oldest

    votes









    0














    This problem will resolve by export module like this:



    export default injectProp<AppProps>(App);


    And update to latest version(0.86.0) will works.



    I made repo for this:
    https://github.com/rico345100/hoc-prop-types-test



    Might be helpful to people who has same issue like me.






    share|improve this answer


























      0














      This problem will resolve by export module like this:



      export default injectProp<AppProps>(App);


      And update to latest version(0.86.0) will works.



      I made repo for this:
      https://github.com/rico345100/hoc-prop-types-test



      Might be helpful to people who has same issue like me.






      share|improve this answer
























        0












        0








        0






        This problem will resolve by export module like this:



        export default injectProp<AppProps>(App);


        And update to latest version(0.86.0) will works.



        I made repo for this:
        https://github.com/rico345100/hoc-prop-types-test



        Might be helpful to people who has same issue like me.






        share|improve this answer












        This problem will resolve by export module like this:



        export default injectProp<AppProps>(App);


        And update to latest version(0.86.0) will works.



        I made repo for this:
        https://github.com/rico345100/hoc-prop-types-test



        Might be helpful to people who has same issue like me.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 26 at 15:04









        modernator

        1,24432448




        1,24432448






























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