how to type transition props in material ui popper

Question

I am using material ui popper and want to separate the transition into a separate function as follows

import React from 'react';
import { makeStyles, Theme, createStyles } from '@material-ui/core/styles';
import Popper from '@material-ui/core/Popper';
import Fade from '@material-ui/core/Fade';

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    paper: {
      border: '1px solid',
      padding: theme.spacing(1),
      backgroundColor: theme.palette.background.paper,
    },
  }),
);

export default function TransitionsPopper() {
  const classes = useStyles();
  const [anchorEl, setAnchorEl] = React.useState<null | HTMLElement>(null);

  const handleClick = (event: React.MouseEvent<HTMLElement>) => {
    setAnchorEl(anchorEl ? null : event.currentTarget);
  };

  const open = Boolean(anchorEl);
  const id = open ? 'transitions-popper' : undefined;

  const popperTrans = ({ TransitionProps }) => (
    <Fade {...TransitionProps} timeout={350}>
      <div className={classes.paper}>The content of the Popper.</div>
    </Fade>
  )
  return (
    <div>
      <button aria-describedby={id} type="button" onClick={handleClick}>
        Toggle Popper
      </button>
      <Popper id={id} open={open} anchorEl={anchorEl} transition>
        {popperTrans}
      </Popper>
    </div>
  );
}

I am using typescript and it's throwing tslint error Binding element 'TransitionProps' implicitly has an 'any' type . How can I type TransitionProps here?

Answer 1

Alternatively, TransitionProps is exported, so you can do:

import { TransitionProps as TransitionPropsType } from "@material-ui/core";

Then:

  const popperTrans = ({ TransitionProps }: { TransitionProps: TransitionPropsType }) => (
    <Fade {...TransitionProps} timeout={350}>
      <div className={classes.paper}>The content of the Popper.</div>
    </Fade>
  )

Answer 2

I found the answer. We can import FadeProps from Fade and use that to type TransitionProps .

import React from 'react';
import { makeStyles, Theme, createStyles } from '@material-ui/core/styles';
import Popper from '@material-ui/core/Popper';
import Fade, { FadeProps } from '@material-ui/core/Fade';

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    paper: {
      border: '1px solid',
      padding: theme.spacing(1),
      backgroundColor: theme.palette.background.paper,
    },
  }),
);

export default function TransitionsPopper() {
  const classes = useStyles();
  const [anchorEl, setAnchorEl] = React.useState<null | HTMLElement>(null);

  const handleClick = (event: React.MouseEvent<HTMLElement>) => {
    setAnchorEl(anchorEl ? null : event.currentTarget);
  };

  const open = Boolean(anchorEl);
  const id = open ? 'transitions-popper' : undefined;

  const popperTrans = ({ TransitionProps }: { TransitionProps: FadeProps }) => (
    <Fade {...TransitionProps} timeout={350}>
      <div className={classes.paper}>The content of the Popper.</div>
    </Fade>
  )
  return (
    <div>
      <button aria-describedby={id} type="button" onClick={handleClick}>
        Toggle Popper
      </button>
      <Popper id={id} open={open} anchorEl={anchorEl} transition>
        {popperTrans}
      </Popper>
    </div>
  );
}