isFallbackCompositionEnd() — react Function Reference

Source Code

packages/react-dom-bindings/src/events/plugins/BeforeInputEventPlugin.js lines 135–155

function isFallbackCompositionEnd(
  domEventName: DOMEventName,
  nativeEvent: any,
): boolean {
  switch (domEventName) {
    case 'keyup':
      // Command keys insert or clear IME input.
      return END_KEYCODES.indexOf(nativeEvent.keyCode) !== -1;
    case 'keydown':
      // Expect IME keyCode on each keydown. If we get any other
      // code we must have exited earlier.
      return nativeEvent.keyCode !== START_KEYCODE;
    case 'keypress':
    case 'mousedown':
    case 'focusout':
      // Events are not possible without cancelling IME.
      return true;
    default:
      return false;
  }
}