gistfile1.txt

//import fs
const fs = require('fs').promises;

//this opens a file called app.json, parses it as json, changes a value, and then saves it.
//put this in an async function
const increment = async () => {

    //first open the file
    const appJson = await fs.readFile('app.json', 'utf8');

    //parse it as json
    const appJsonParsed = JSON.parse(appJson);

    //get the current version
    const currentVersion = appJsonParsed.expo.version;

    //split it into an array
    const currentVersionArray = currentVersion.split('.');

    //increment the last number
    const newVersion = currentVersionArray.map((n, i) => i === 2 ? parseInt(n) + 1 : n).join('.');

    //put this into the json
    appJsonParsed.expo.version = newVersion;

    //stringify it
    const appJsonStringified = JSON.stringify(appJsonParsed, null, 2);

    //write it back to the file
    await fs.writeFile('app.json', appJsonStringified);
    
    //say goodbye
    console.log('Version incremented to ' + newVersion);
}

increment();