Function formatElement

src/helpers/format-element.ts:24–53

(
  instance: TestInstance | null,
  { compact, highlight = true, mapProps = defaultMapProps }: FormatElementOptions = {},
)

 * @param instance Instance to format.
 */
export function formatElement(
  instance: TestInstance | null,
  { compact, highlight = true, mapProps = defaultMapProps }: FormatElementOptions = {},
) {
  if (instance == null) {
    return '(null)';
  }

  const { children, ...props } = instance.props;
  const childrenToDisplay = typeof children === 'string' ? [children] : undefined;

  return prettyFormat(
    {
      // This prop is needed persuade the prettyFormat that the element is
      // a JsonNode instance, so it is formatted as JSX.
      $$typeof: Symbol.for('react.test.json'),
      type: `${instance.type}`,
      props: mapProps ? mapProps(props) : props,
      children: childrenToDisplay,
    },
    // See: https://www.npmjs.com/package/pretty-format#usage-with-options
    {
      plugins: [plugins.ReactTestComponent, plugins.ReactElement],
      printFunctionName: false,
      printBasicPrototype: false,
      highlight: highlight,
      min: compact,
    },
  );
}

export function formatElementList(instances: TestInstance[], options?: FormatElementOptions) {
  if (instances.length === 0) {