Go to the google apps script and create a new project by clicking in the button showed in the next image.

It would be a good idea to rename the project to something like "gcal-sync".

Click on the initial file, which is the rectangle-1 on the image.

Replace the initial content present in the rectangle-2 with the gcal-sync code provided bellow.

⚠️ Warning

Remember to update the configs object according to your data and needs.

function getConfigs() {
  const configs = {
    settings: {
      sync_function: 'sync',                // function name to run every x minutes
      timezone_offset_correction: 0,        // hour correction to match maybe a daylight saving difference (if you want the events 1 hour "before", then put -1)
      update_frequency: 5,                  // wait time between sync checks (must be multiple of 5: 10, 15, etc)
      skip_mode: false,                     // if set to true, it will skip every sync (useful for not messing up your data if any bug occurs repeatedly)
      per_day_emails: {
        time_to_send: '22:00',              // time to email the summary
        email_daily_summary: false,         // email all the actions done in the day on the above time
        email_new_gcal_sync_release: false, // check one time per day and email when a new gcal-sync version is released on the above time
      },
      per_sync_emails: {
        email_errors: false,                // email when some error occurs
        email_session: false                // email when any item was added, updated or removed from your gcal
      }
    },
    github_sync: {
      username: 'lucasvtiradentes',         // github username
      personal_token: '',                   // github token, required if you want to sync private repo commits
      commits_configs: {
        should_sync: true,                  // controls if the github commits sync should be done
        commits_calendar: 'gh_commits',     // google calendar to insert commits as events
        ignored_repos: ['github-assets'],   // ignored repositories string array: ['repo1', 'repo2']
        parse_commit_emojis: true           // parse string emojis (:tada:) to emojis (✨)
      }
    }
  };
  return configs
}
function getGcalSync(){
  let gcalSync;
  const configs = getConfigs()
  const useDevVersion = false
  if (useDevVersion){
    const GcalSync = getGcalSyncDev()
    gcalSync = new GcalSync(configs);
  } else {
    const version = "2.1.3"
    const gcalSyncContent = UrlFetchApp.fetch(https://cdn.jsdelivr.net/npm/gcal-sync@2.1.3).getContentText();
    eval(gcalSyncContent)
    gcalSync = new GcalSync(configs);
  }
  return gcalSync;
}
function install() {
  const gcalSync = getGcalSync();
  gcalSync.install();
}
function uninstall() {
  const gcalSync = getGcalSync();
  gcalSync.uninstall();
}
function sync(){
  const gcalSync = getGcalSync()
  try{
    console.log(gcalSync.sync())
  } catch(e){
    gcalSync.handleError(e)
  }
}
function doGet(reqParams) {
  const gcalSync = getGcalSync()
  const response = {
    sessionData: {},
    logs: [],
    error: null
  }
  try {
    response.sessionData = gcalSync.sync()
    response.logs = gcalSync.getSessionLogs()
  } catch (e){
    response.error = e
    gcalSync.handleError(e)
  }
  return ContentService.createTextOutput(JSON.stringify(response)).setMimeType(ContentService.MimeType.JSON)
}

Go to the project settings by clicking on the first image rectangle. After that, check the option to show the appsscript.json in our project, a file that manages the required google api access.

Go back to the project files, and replace the content present in the appsscript.json with the following code:

{
  "timeZone": "Etc/GMT",
  "dependencies": {
    "enabledAdvancedServices": [
      {
        "userSymbol": "Calendar",
        "serviceId": "calendar",
        "version": "v3"
      }
    ]
  },
  "oauthScopes": [
    "https://www.googleapis.com/auth/script.scriptapp",
    "https://www.googleapis.com/auth/script.external_request",
    "https://www.googleapis.com/auth/calendar",
    "https://www.googleapis.com/auth/tasks",
    "https://www.googleapis.com/auth/script.send_mail",
    "https://www.googleapis.com/auth/userinfo.email"
  ],
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8",
  "webapp": {
    "executeAs": "USER_DEPLOYING",
    "access": "ANYONE_ANONYMOUS"
  }
}

Just follow what the bellow image shows, which is to select the install function and run it.

After, a popup will appear asking your permission, and you'll have to accept it.

It will allow you to sync whenever you go to a generated link.

Just do as the image shows.

To setup this project in your computer, run the following commands:

``bash


Clone this repository

$ git clone https://github.com/lucasvtiradentes/gcal-sync

Go into the repository

$ cd gcal-sync

Install dependencies

$ npm install
`

If you want to contribute to the project, fork the project, make the necessary changes, and to test your work on google apps scripts with do this:

1. run npm run build in order to generate the dist files. After that, create a new GAS file (ex: dev_gcal.gs) and paste the content of gcalsync_dev on this new GAS file.

2. after that, update the content of the getGcalSync as specified bellow:

`js
function getGcalSync() {
// ...
const useDevVersion = true; // set this to true to use your gcal-sync version

if (useDevVersion) {
const GcalSync = getGcalSyncDev(); // your work is here
}
// ...
}
``

now you can test your work really easy on production/GAS!