I want to add items to [string].
But the following code fails at param.push statement.

EDIT

declare var sqlitePlugin:any;

var query: string = `SELECT * FROM items `;



var param: [string];



if (options['limit']) {

  var limit = options['limit'];

  query = query +  LIMIT ? ;

  param.push(String(limit));

}



if (options['offset']) {

  var offset = options['offset'];

  query = query +  OFFSET ? ;

  param.push(String(offset));

}



sqlitePlugin.openDatabase({name: 'Items.db', key: 'Password', location: 'default'}, (db) =>  {

  db.transaction((tx)=> {

    tx.execQuery(query, param, (resultSet)=>{

    this.items = [];

      for(let i = 0; i < resultSet.rows.length; i++) {

        var item: Item = new Item();

        item.code = resultSet.rows.item(i).item_code;

        item.name = resultSet.rows.item(i).item_name;

        this.items.push(item);

      }

      callback(this.items);

    } );

  }

});

Sorry to ask this very basic question but I'm struggling for 2 days..
Please give me any hint or link.

Thanks in advance.