treefmt/test/examples/javascript/source/hello.js

const helloFactory = function ({ React }) {
    const { string, func } = React.PropTypes;

    return function Hello(props) {
        // React wants propTypes & defaultProps
        // to be static.
        Hello.propTypes = {
            word: string,
            mode: string,

            actions: React.PropTypes.shape({
                setWord: func.isRequired,
                setMode: func.isRequired,
            }),
        };

        return {
            props, // set props

            componentDidUpdate() {
                this.refs.wordInput.getDOMNode().focus();
            },

            render() {
                const { word, mode } = this.props;

                const { setMode, setWord } = this.props.actions;

                const styles = {
                    displayMode: {
                        display: mode === "display" ? "inline" : "none",
                    },

                    editMode: {
                        display: mode === "edit" ? "inline" : "none",
                    },
                };

                const onKeyUp = function (e) {
                    if (e.key !== "Enter") return;

                    setWord(e.target.value);
                    setMode("display");
                };

                return (
                    <p>
                        Hello,&nbsp;
                        <span
                            style={styles.displayMode}
                            onClick={() => setMode("edit")}
                        >
                            {word}!
                        </span>
                        <input
                            ref="wordInput"
                            style={styles.editMode}
                            placeholder={word}
                            onKeyUp={onKeyUp}
                        />
                    </p>
                );
            },
        };
    };
};

export default helloFactory;