react-render-prop-type

Handy helper for components which need to have render prop.

Installation

yarn add react-render-prop-type

Description

By default the renderProp will extend your props with a children render prop:

type ColumnProps = {
  rowId: string;
};

const Column = ({
  rowId,
  attr,
  children /* <- default name */,
}: ColumnProps &
  RenderProp<{
    data: string;
  } /* <- props to be passed to the render function */>) => {
  const row = useFakeTable(rowId);

  return (
    <td>
      {children(
        { data: row[attr] } /* <- props to be passed to the render function */
      )}
    </td>
  );
};

const PhoneColumn = (props: ColumnProps) => (
  <Column {...columnProps} attr="phone">
    {({ data }) => <a href={`tel:${data}`}>{data}</a>}
  </Column>
);

const AvatarColumn = (props: ColumnProps) => (
  <Column {...columnProps} attr="imageUrl">
    {({ data }) => <Avatar img={data} />}
  </Column>
);

Optionally, you can specify custom prop name, e.g. when you can't use the default children prop.

type ColumnProps = {
  rowId: string;
};

const Column = ({
  rowId,
  attr,
  render, // <- custom name
}: ColumnProps &
  RenderProp<{ data: string }, 'render' /* <- custom name */>) => {
  const row = useFakeTable(rowId); // mock example

  return <td>{render({ data: row[attr] })}</td>;
};

const PhoneColumn = (props: ColumnProps) => (
  <Column
    {...columnProps}
    attr="phone"
    render={({ data }) => <a href={`tel:${data}`}>{data}</a>}
  />
);

const AvatarColumn = (props: ColumnProps) => (
  <Column
    {...columnProps}
    attr="imageUrl"
    render={({ data }) => <Avatar img={data} />}
  />
);

Advanced Example

Let's assume we are developing library component FormField which renders input and we want to enable our library users to decorate the input with before and after props. Both of these props receive current input value, so the before/after nodes can be styled accordingly:

import { RenderProp } from 'react-render-prop-type';

type Props = { name: string } & RenderProp<
  { value: string },
  'before' | 'after'
>;

const FormField = ({ before, after }: Props) => {
  const { value, ...control } = useFakeFormField({ name }); // mock example

  return (
    <>
      {before({ value })}
      <input value={value} {...control} />
      {after({ value })}
    </>
  );
};

const IconForm = () => (
  <FormField
    name="amount"
    before={({ value }) => (value ? <SuccessIcon /> : <EmptyIcon />)}
    after={({ value }) => (value ? <SuccessIcon /> : <EmptyIcon />)}
  />
);