function printComplexValue()

in packages/pretty-format/src/index.ts [203:298]
90 lines of code
24 McCabe index (conditional complexity)

function printComplexValue(
  val: any,
  config: Config,
  indentation: string,
  depth: number,
  refs: Refs,
  hasCalledToJSON?: boolean,
): string {
  if (refs.indexOf(val) !== -1) {
    return '[Circular]';
  }
  refs = refs.slice();
  refs.push(val);

  const hitMaxDepth = ++depth > config.maxDepth;
  const min = config.min;

  if (
    config.callToJSON &&
    !hitMaxDepth &&
    val.toJSON &&
    typeof val.toJSON === 'function' &&
    !hasCalledToJSON
  ) {
    return printer(val.toJSON(), config, indentation, depth, refs, true);
  }

  const toStringed = toString.call(val);
  if (toStringed === '[object Arguments]') {
    return hitMaxDepth
      ? '[Arguments]'
      : `${min ? '' : 'Arguments '}[${printListItems(
          val,
          config,
          indentation,
          depth,
          refs,
          printer,
        )}]`;
  }
  if (isToStringedArrayType(toStringed)) {
    return hitMaxDepth
      ? `[${val.constructor.name}]`
      : `${
          min
            ? ''
            : !config.printBasicPrototype && val.constructor.name === 'Array'
            ? ''
            : `${val.constructor.name} `
        }[${printListItems(val, config, indentation, depth, refs, printer)}]`;
  }
  if (toStringed === '[object Map]') {
    return hitMaxDepth
      ? '[Map]'
      : `Map {${printIteratorEntries(
          val.entries(),
          config,
          indentation,
          depth,
          refs,
          printer,
          ' => ',
        )}}`;
  }
  if (toStringed === '[object Set]') {
    return hitMaxDepth
      ? '[Set]'
      : `Set {${printIteratorValues(
          val.values(),
          config,
          indentation,
          depth,
          refs,
          printer,
        )}}`;
  }

  // Avoid failure to serialize global window object in jsdom test environment.
  // For example, not even relevant if window is prop of React element.
  return hitMaxDepth || isWindow(val)
    ? `[${getConstructorName(val)}]`
    : `${
        min
          ? ''
          : !config.printBasicPrototype && getConstructorName(val) === 'Object'
          ? ''
          : `${getConstructorName(val)} `
      }{${printObjectProperties(
        val,
        config,
        indentation,
        depth,
        refs,
        printer,
      )}}`;
}