if (__DEV__) {
      warning(
        prevID === undefined || prevID === nextID,
        'RelayResponseNormalizer: Invalid record. The record contains ' +
          'references to the conflicting field, %s and its id values: %s and %s. ' +
          'We need to make sure that the record the field points ' +
          'to remains consistent or one field will overwrite the other.',
        storageKey,
        prevID,
        nextID,
      );
    }
// NOTE: Only call this function in DEV
Only call this function in DEV
Only call this function in DEV
if (__DEV__) {
      warning(
        prevID === undefined || prevID === nextID,
        'RelayResponseNormalizer: Invalid record. The record contains ' +
          'references to the conflicting field, %s and its id values: %s and %s. ' +
          'We need to make sure that the record the field points ' +
          'to remains consistent or one field will overwrite the other.',
        storageKey,
        prevID,
        nextID,
      );
    }
if ( __DEV__ ) { warning ( prevID === undefined || prevID === nextID , 'RelayResponseNormalizer: Invalid record. The record contains ' + 'references to the conflicting field, %s and its id values: %s and %s. ' + 'We need to make sure that the record the field points ' + 'to remains consistent or one field will overwrite the other.' , storageKey , prevID , nextID , ) ; }
NOTE: Only call this function in DEV
NOTE : Only call this function in DEV