old_contents: import React, {PropTypes} from 'react';
  import Slider from 'material-ui/Slider';
  
  import {rangeSpec} from 'react-jsonschema-form/lib/utils';
  
  function RangeWidget(props) {
    console.log(props);
    const {
        schema,
        id,
        name,
        value,
        required,
        disabled,
        onChange
    } = props;
    return (
        <div>
          <span>{value}</span>
          <Slider
              id={id}
              name={name}
              value={value}
              required={required}
              disabled={disabled}
              onChange={(event, value) => onChange(value)}
              {...rangeSpec(schema)}/>
        </div>
    );
  }
  
  if (process.env.NODE_ENV !== "production") {
    RangeWidget.propTypes = {
      value: PropTypes.oneOfType([
        PropTypes.string,
        PropTypes.number,
      ]),
    };
  }
  
  export default RangeWidget;
  
new_contents: import React, {PropTypes} from 'react';
  import Slider from 'material-ui/Slider';
  
  import {rangeSpec} from 'react-jsonschema-form/lib/utils';
  
  function RangeWidget(props) {
    const {
        schema,
        id,
        name,
        value,
        required,
        disabled,
        onChange
    } = props;
    return (
        <div>
          <span>{value}</span>
          <Slider
              id={id}
              name={name}
              value={value}
              required={required}
              disabled={disabled}
              onChange={(event, value) => onChange(value)}
              {...rangeSpec(schema)}/>
        </div>
    );
  }
  
  if (process.env.NODE_ENV !== "production") {
    RangeWidget.propTypes = {
      value: PropTypes.oneOfType([
        PropTypes.string,
        PropTypes.number,
      ]),
    };
  }
  
  export default RangeWidget;
  
subject: remove console.log