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import * as React from 'react';
export class Counter extends React.Component<{}, { counter: number }> {
constructor(props: {}) {
super(props);
this.state = {
counter: 0
};
}
render() {
return (
<button onClick={ () => this.setState({ counter: this.state.counter + 1 }) }>{ this.state.counter }</button>
)
}
}
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