ScriptEditorService

game.ScriptEditorService:DeregisterAutocompleteCallback("foo")

local ScriptEditorService = game:GetService("ScriptEditorService")

ScriptEditorService:DeregisterScriptAnalysisCallback("foo")

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

local documents = ScriptEditorService:GetScriptDocuments()
local scriptDocument
-- Find the first open script document
for _, document in documents do
	-- The Command Bar can't be closed, so don't select it
	if not document:IsCommandBar() then
		scriptDocument = document
		break
	end
end

if scriptDocument then
	local success, err = scriptDocument:CloseAsync()
	if success then
		print(`Closed {scriptDocument.Name}`)
	else
		warn(`Failed to close {scriptDocument.Name} because: {err}`)
	end
else
	print("No open scripts")
end

--!nocheck

--[[
	To run:
		1. Ensure Output view is open
		2. Run the below code in the Command Bar
		3. Scroll up and down in the opened Script window

	Print statements from the ViewportChanged event will appear in the Output
]]

local Workspace = game:GetService("Workspace")
local ScriptEditorService = game:GetService("ScriptEditorService")

-- Create text that spans many lines
local dummyText = string.rep("-- Dummy Text\n", 60)

-- Create a script containing the dummy text and open it
local otherScript = Instance.new("Script")
otherScript.Source = dummyText
otherScript.Parent = Workspace
local success, err = ScriptEditorService:OpenScriptDocumentAsync(otherScript)
if not success then
	warn(`Failed to open script because: {err}`)
	return
end

-- Get a reference to the opened script
local scriptDocument = ScriptEditorService:FindScriptDocument(otherScript)

local function onViewportChanged(startLine: number, endLine: number)
	print(`Script Viewport Changed - startLine: {startLine}, endLine: {endLine}`)
end
-- Connect the ViewportChanged event to the function above that prints the start and end line of the updated viewport
scriptDocument.ViewportChanged:Connect(onViewportChanged)

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

local scriptDocuments = ScriptEditorService:GetScriptDocuments()
for _, scriptDocument in scriptDocuments do
	-- Prints the name of each script
	if not scriptDocument:IsCommandBar() then
		print(scriptDocument.Name)
	end
end

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

type Request = {
	position: {
		line: number,
		character: number,
	},
	textDocument: {
		document: ScriptDocument?,
		script: LuaSourceContainer?,
	},
}

type Response = {
	items: {
		{
			label: string,
			kind: Enum.CompletionItemKind?,
			tags: { Enum.CompletionItemTag }?,
			detail: string?,
			documentation: {
				value: string,
			}?,
			overloads: number?,
			learnMoreLink: string?,
			codeSample: string?,
			preselect: boolean?,
			textEdit: {
				newText: string,
				replace: {
					start: { line: number, character: number },
					["end"]: { line: number, character: number },
				},
			}?,
		}
	},
}

local autocompleteCallback = function(request: Request, response: Response): Response
	local item = {
		label = "foo",
		preselect = true,
	}
	table.insert(response.items, item)
	return response
end

ScriptEditorService:RegisterAutocompleteCallback("foo", 1, autocompleteCallback)

-- To deregister the callback, run the following code in the Command Bar

ScriptEditorService:DeregisterAutocompleteCallback("foo")

type Request = {
  ["script"]: LuaSourceContainer,
}

type Response = {
  diagnostics: {
    {
      range: {
        start: {
          line: number,
          character: number,
        },
        ["end"]: {
          line: number,
          character: number,
        }
      },
      code: string?,
      message: string,
      severity: Enum.Severity?,
      codeDescription: { href: string }?,
    }
  }
}

local ScriptEditorService = game:GetService("ScriptEditorService")

ScriptEditorService:RegisterScriptAnalysisCallback("foo", 1, function(
  Req : Request): Response
  local response = {
    diagnostics = {}
  }
  local lineNo = 1
  
  -- Iterate line by line
  for text, newline in Req.script.Source:gmatch("([^\r\n]*)([\r\n]*)") do

    local startIndex, endIndex = string.find(text, "Foo")
    if startIndex and endIndex then
      table.insert(response.diagnostics, {
        range = {
          ["start"] = {
            line = lineNo,
            character = startIndex,
          },
          ["end"] = {
            line = lineNo,
            character = endIndex,
          },
        },
        code = "FooFinder",
        message = "Foo found here!",
        severity = Enum.Severity.Warning,
      })
    end
    lineNo = lineNo + #newline:gsub("\n+", "\0%0\0"):gsub(".%z.", "."):gsub("%z", "")
  end
  return response
end)

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")
local Workspace = game:GetService("Workspace")

local newScript = Instance.new("Script")
newScript.Parent = Workspace

local success, err = ScriptEditorService:OpenScriptDocumentAsync(newScript)
if success then
	print("Opened script document")
else
	print(`Failed to open script document: {err}`)
end

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

ScriptEditorService.TextDocumentDidChange:Connect(function(scriptDocument, changes)
	print("Changed", scriptDocument, changes)
end)

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

ScriptEditorService.TextDocumentDidClose:Connect(function(scriptDocument)
	print("Closed", scriptDocument)
end)

--!nocheck

-- Run the following code in the Command Bar

local ScriptEditorService = game:GetService("ScriptEditorService")

ScriptEditorService.TextDocumentDidOpen:Connect(function(scriptDocument)
	print("Opened", scriptDocument)
end)