buildscript.js

// concatinates file names 
function stringOfFiles(dir:string, array:[string], version:number, rev:boolean) {
  let finalArr = [];
  if (rev) {
    for (let i = array.length-1; i >= version;i--) {
      finalArr.push("-f " + dir + '/' + array[i])
    }
    return " -a " + finalArr.join(' ')
  } else {
    for (let i = 0; i < version;i++) {
      finalArr.push("-f " + dir + '/' + array[i])
    }
    return " -a " + finalArr.join(' ')
  }
}

// this function is called in this section of the db build script

...
func.filesInDir('./database-builds/up', function(err:Error, files:[string]){
  if (err) {
    console.log(err)
  } else {
    let fileString = func.stringOfFiles('./database-builds/up', files, result.version, false);
    console.log(fileString);
    func.childProcess(dbConnect + fileString, function(err:Error, stdout:string, stderr:string) {
      if (err) {
        console.error(`exec error: ${err}`);
        cb(err);
      } else {
        console.log(`stdout: ${stdout}`);
        console.log(`stderr: ${stderr}`);
        console.log('tables added');
        func.makeJSONfromObj('./sdist/config/connect-config.json', jsonConfig, function(err:string) { // store that information in a JSON
          if(err) {
            console.log(err)
            cb(err);
          } else {
            console.log('successfuly made config JSON')
            cb();
          }
        });
      }
    })
  }
})
...