React createElement type is invalid - reactjs

Question

I am having trouble trying to publish a node module, material-ui-next-datepicker
It is working locally but not when installed as a node module
import * as React from 'react'
import * as ReactDOM from 'react-dom'
import {MuiThemeProvider, createMuiTheme, withStyles, StyledComponentProps, Theme} from 'material-ui/styles'
import DateFormatInput from 'material-ui-next-datepicker'
const theme = createMuiTheme()
const styles = (theme:Theme):Record<string, React.CSSProperties> => ({
container: {
width: '100vw',
height: '100vh',
display: 'flex',
justifyContent: 'center',
alignItems: 'center'
}
})
#(withStyles as any)(styles)
class DemoPage extends React.Component<DemoPageProps, DemoPageState> {
constructor(props) {
super(props)
this.state = {
date: undefined
}
}
onChange = (date:Date) => {
console.log(date)
this.setState({date})
}
render() {
const {classes} = this.props
const {date} = this.state
return (
<div className={classes.container}>
<DateFormatInput name='date-input' value={date} onChange={this.onChange} label='Date'/>
</div>
)
}
}
interface DemoPageProps extends React.Props<{}>, StyledComponentProps {
}
interface DemoPageState {
date: Date
}
ReactDOM.render(
<MuiThemeProvider theme={theme}>
<DemoPage/>
</MuiThemeProvider>
, document.getElementById('root'))
Here's the error in the browser
When I do print out DateFormatInput, it looks fine...definitely not undefined
I am not too familiar with dependencies and how to differentiate between peer, ambient or bundled. So, I do need some help in making this node module work

Answer 1

Finally able to solve this issue simply by adding .npmignore
I removed all my demo files like:
demo/
src/
index.html
tsconfig.json
webpack.config.js
Then it starts working fine by importing...