Subtitle.js

import * as React from "react";
import { makeStyles } from "@material-ui/styles";
import { upperFirst } from "lodash";
import Breadcrumbs from "@material-ui/core/Breadcrumbs";
import NavigateNextIcon from "@material-ui/icons/NavigateNext";
import Typography from "@material-ui/core/Typography";
import { toVerboseTimeRange } from "../util";

const useStyles = makeStyles({
  root: {
    "& > * + *": {
      marginTop: 2,
    },
  },
  link: {
    cursor: "pointer",
  },
});

const Subtitle = ({ report, onClick }) => {
  const classes = useStyles();

  const { aggregateBy, window } = report;

  return (
    <div className={classes.root}>
      <Breadcrumbs
        separator={<NavigateNextIcon fontSize="small" />}
        aria-label="breadcrumb"
        onClick={onClick}
      >
        {aggregateBy && aggregateBy.length > 0 ? (
          <Typography>
            {toVerboseTimeRange(window)} by {upperFirst(aggregateBy)}
          </Typography>
        ) : (
          <Typography>{toVerboseTimeRange(window)}</Typography>
        )}
      </Breadcrumbs>
    </div>
  );
};

export default React.memo(Subtitle);