if (__DEV__) {
      const dataID = RelayModernRecord.getDataID(record);
      var previousValue = RelayModernRecord.getValue(record, storageKey);
      warning(
        storageKey === TYPENAME_KEY ||
          previousValue === undefined ||
          areEqual(previousValue, fieldValue),
        'RelayResponseNormalizer: Invalid record. The record contains two ' +
          'instances of the same id: `%s` with conflicting field, %s and its values: %s and %s. ' +
          'If two fields are different but share ' +
          'the same id, one field will overwrite the other.',
        dataID,
        storageKey,
        previousValue,
        fieldValue,
      );
    }
// NOTE: Only call this function in DEV
Only call this function in DEV
Only call this function in DEV
if (__DEV__) {
      const dataID = RelayModernRecord.getDataID(record);
      var previousValue = RelayModernRecord.getValue(record, storageKey);
      warning(
        storageKey === TYPENAME_KEY ||
          previousValue === undefined ||
          areEqual(previousValue, fieldValue),
        'RelayResponseNormalizer: Invalid record. The record contains two ' +
          'instances of the same id: `%s` with conflicting field, %s and its values: %s and %s. ' +
          'If two fields are different but share ' +
          'the same id, one field will overwrite the other.',
        dataID,
        storageKey,
        previousValue,
        fieldValue,
      );
    }
if ( __DEV__ ) { const dataID = RelayModernRecord . getDataID ( record ) ; var previousValue = RelayModernRecord . getValue ( record , storageKey ) ; warning ( storageKey === TYPENAME_KEY || previousValue === undefined || areEqual ( previousValue , fieldValue ) , 'RelayResponseNormalizer: Invalid record. The record contains two ' + 'instances of the same id: `%s` with conflicting field, %s and its values: %s and %s. ' + 'If two fields are different but share ' + 'the same id, one field will overwrite the other.' , dataID , storageKey , previousValue , fieldValue , ) ; }
NOTE: Only call this function in DEV
NOTE : Only call this function in DEV