How can i read and write to cells in the same function?

I would like to read the spreadsheet cell H2 in the same function blackList

With this script, i am currently writing to cell H1. I would like to read cell H2 as well.

This is my updated script:

const { setTimeout } = require("timers/promises"); // cause a delay if needed

async function blackList() { 
    const sheets = google.sheets({ version: "v4", auth });
    const spreadsheetId = "myidhere";
  
    const sheetName = "BOTDATA";
    const cells = ["H1"];
    const valueInputOption = "USER_ENTERED";
    const userInput = interaction.options.get('steamid').value;
    await sheets.spreadsheets.values.update({
      spreadsheetId,
      range: `'${sheetName}'!${cells[0]}`,
      resource: { values: [[userInput]] },
      valueInputOption,
    });
     await setTimeout(1000); // set time on delay if needed

    const obj = await sheets.spreadsheets.values.get({spreadsheetId, range: `'${sheetName}'!H2`});
    const value = obj.data.values[0][0];
   // console.log(value);
    return value;
  }

})()

I believe your goal is as follows.

• You want to put a value to a cell "H1" and want to retrieve a value from "H2". From Depending on the value of the cell 'H1' is when the userInput is updated, it will change cell "H2" Value. And i would like to display H2., it seems that the value "H2" is changed by the value of "H1".

In this case, how about the following modification?

Modified script:

const { setTimeout } = require("timers/promises"); // added

async function blackList() {
  const sheets = google.sheets({ version: "v4", auth });
  const spreadsheetId = "myIdhere";

  const sheetName = "BOTDATA";
  const cells = ["H1"];
  const valueInputOption = "USER_ENTERED";
  const userInput = interaction.options.get("steamid").value;
  await sheets.spreadsheets.values.update({
    spreadsheetId,
    range: `'${sheetName}'!${cells[0]}`,
    resource: { values: [[userInput]] },
    valueInputOption,
  });

  await setTimeout(2000); // Please adjust this value to your situation.

  const obj = await sheets.spreadsheets.values.get({spreadsheetId, range: `'${sheetName}'!H2`});
  const value = obj.data.values[0][0];
  console.log(value);
}

• In this modification, after a value was put into the cell "H1", the cell value of "H2" is retrieved.
• In this modification, the wait time is set for calculating the formula of "H2". But, I have no information about your actual situation. So, I'm not sure whether await setTimeout(2000); is required to be used. So, please test with and without it, and decide whether you use it.

Note:

• setTimeout can be used after Node.js 16. Please be careful about this.