I need to read a file line by line and store the result in a variable, is that possible?

const fs = require('fs');

const allFileContents = fs.readFileSync('test.log', 'utf-8');
allFileContents.split(/\r?\n/).forEach(line =>  {
  console.log(`Line from file: ${line}`);
  return line; *<-- Returns undefined because it goes through all the lines of the file, but could everything be stored in a single variable to return the result?*
});

File example:

1 Word
2 Word
3 Word

Part of my complete code:

function readLogFile(){
        const allFileContents = fs.readFileSync('test.log', 'utf-8');
                allFileContents.split(/\r?\n/).forEach(line =>  {
                return line;
        });
}

var file = await readLogFile();
console.log(file); //Response: Undefined
sendEmailNotification(jobname, status, email, file)