update google sheet script with another script - google-apps-script

Question

I have a folder with approximately 140 google sheets and a main standalone google script that I call with a library script from each sheet but need to add/update all of the scripts attached to each google sheet script. Currently the only way I have found is to open each sheet script and add the library script save and move on but 140 sheets takes a long time. I know all my sheets that i need scripts adding or updating are in one folder so thinking I could use something like this to loop through all the gsheets but can't find away to edit the scripts from here...
function scriptupdate() {
var folder = DriveApp.getFolderById('FOLDER CONTAINING THE GSHEETS ID');
var files = folder.getFiles();
while (files.hasNext()) {
var file = files.next();
Logger.log("File Name is "+file.getName());
Logger.log("File ID is "+file.getId());
}
}
I'm not sure if what I'm trying to do is possible but trying to save a lot of time if this is doable but really appreciate any help and guidance offered

Answer 1

Answer
You can create and update projects and its content using the projects resource methods. As these have no built-in service in Apps Script they must be called with urlFetchApp.fetch.
When writing functions, remember to put them between grave accents (`). You can use the key combination Ctrl + Shift + I to fix all the indentation and spacing in the whole script file.
Code
function scriptupdate() {
// GET FILES
var folder = DriveApp.getFolderById('FOLDER CONTAINING THE GSHEETS ID');
var files = folder.getFiles();
while (files.hasNext()) {
// GET FILE INFORMATION
var file = files.next();
var name = file.getName()
var fileId = file.getId()
// CREATE CONTAINER-BOUND SCRIPT
var url = 'https://script.googleapis.com/v1/projects'
var formData = {
'title': name,
'parentId': fileId
};
var options = {
method: 'post',
headers: { Authorization: "Bearer " + ScriptApp.getOAuthToken() },
payload: formData,
muteHttpExceptions: true
};
var res = JSON.parse(UrlFetchApp.fetch(url, options).getContentText())
var scriptId = res["scriptId"]
// UPDATE PROJECT CONTENT
var url = 'https://script.googleapis.com/v1/projects/' + scriptId + '/content';
var formData = {
"files": [
{
"name": "appsscript",
"type": "JSON",
"source": `{
"timeZone": "America/New_York",
"dependencies": {},
"exceptionLogging": "STACKDRIVER",
"runtimeVersion": "V8"
}`
},
{
"name": "main",
"source":
`function main() {
console.log('hello world')
}`,
"type": "SERVER_JS"
}
]
}
var options = {
method: 'put',
contentType: 'application/json',
payload: JSON.stringify(formData),
headers: { Authorization: "Bearer " + ScriptApp.getOAuthToken() },
muteHttpExceptions: true
};
var res = UrlFetchApp.fetch(url, options).getContentText()
console.log(res)
}
}
Reference
projects
projects: create
projects: updateContent
urlFetchApp.fetch