facebook/react · error · Error

101

101

Error message

EventPluginRegistry: Cannot inject event plugin ordering more than once. You are likely trying to load more than one copy of React.

What it means

Error "EventPluginRegistry: Cannot inject event plugin ordering more than once. You are likely trying to load more than one copy of React." thrown in facebook/react.

Source

Thrown at packages/react-native-renderer/src/legacy-events/EventPluginRegistry.js:217

 */
export const possibleRegistrationNames: {
  [lowerCasedName: string]: string,
} = __DEV__ ? {} : (null as any);
// Trust the developer to only use possibleRegistrationNames in __DEV__

/**
 * Injects an ordering of plugins (by plugin name). This allows the ordering
 * to be decoupled from injection of the actual plugins so that ordering is
 * always deterministic regardless of packaging, on-the-fly injection, etc.
 *
 * @param {array} InjectedEventPluginOrder
 * @internal
 */
export function injectEventPluginOrder(
  injectedEventPluginOrder: EventPluginOrder,
): void {
  if (eventPluginOrder) {
    throw new Error(
      'EventPluginRegistry: Cannot inject event plugin ordering more than ' +
        'once. You are likely trying to load more than one copy of React.',
    );
  }

  // Clone the ordering so it cannot be dynamically mutated.
  // $FlowFixMe[method-unbinding] found when upgrading Flow
  eventPluginOrder = Array.prototype.slice.call(injectedEventPluginOrder);
  recomputePluginOrdering();
}

/**
 * Injects plugins to be used by plugin event system. The plugin names must be
 * in the ordering injected by `injectEventPluginOrder`.
 *
 * Plugins can be injected as part of page initialization or on-the-fly.
 *
 * @param {object} injectedNamesToPlugins Map from names to plugin modules.

View on GitHub (pinned to eafeac097b)

When it happens

Trigger: Thrown at packages/react-native-renderer/src/legacy-events/EventPluginRegistry.js:217 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of facebook/react@eafeac097b (2026-08-21). Data as JSON: /api/errors/555bb766cb1825c9. Report an issue: GitHub.