export default function isValidElementType()

in packages/shared/isValidElementType.js [38:79]

• 34 lines of code
• 28 McCabe index (conditional complexity)

export default function isValidElementType(type: mixed): boolean {
  if (typeof type === 'string' || typeof type === 'function') {
    return true;
  }

  // Note: typeof might be other than 'symbol' or 'number' (e.g. if it's a polyfill).
  if (
    type === REACT_FRAGMENT_TYPE ||
    type === REACT_PROFILER_TYPE ||
    (enableDebugTracing && type === REACT_DEBUG_TRACING_MODE_TYPE) ||
    type === REACT_STRICT_MODE_TYPE ||
    type === REACT_SUSPENSE_TYPE ||
    type === REACT_SUSPENSE_LIST_TYPE ||
    (enableLegacyHidden && type === REACT_LEGACY_HIDDEN_TYPE) ||
    type === REACT_OFFSCREEN_TYPE ||
    (enableScopeAPI && type === REACT_SCOPE_TYPE) ||
    (enableCacheElement && type === REACT_CACHE_TYPE) ||
    (enableTransitionTracing && type === REACT_TRACING_MARKER_TYPE)
  ) {
    return true;
  }

  if (typeof type === 'object' && type !== null) {
    if (
      type.$$typeof === REACT_LAZY_TYPE ||
      type.$$typeof === REACT_MEMO_TYPE ||
      type.$$typeof === REACT_PROVIDER_TYPE ||
      type.$$typeof === REACT_CONTEXT_TYPE ||
      type.$$typeof === REACT_FORWARD_REF_TYPE ||
      // This needs to include all possible module reference object
      // types supported by any Flight configuration anywhere since
      // we don't know which Flight build this will end up being used
      // with.
      type.$$typeof === REACT_MODULE_REFERENCE ||
      type.getModuleId !== undefined
    ) {
      return true;
    }
  }

  return false;
}