macos – Code works in ScriptEditor but not with osascript

I’m confused about what’s going wrong here.

I have this code

let Calendar = Application('Calendar');
console.log('Here #1');
console.log(Calendar.calendars.length);
console.log('Here #2');

If I run it in ScriptEditor the code works fine. I get this, expected, output.

/* Here #1 */
/* 17 */
/* Here #2 */

But if I run the code using osascript it doesn’t give me the expected output.

(0)~/<3>Documents>osascript -l JavaScript TestCalendar.scpt 
Here #1
TestCalendar.scpt: execution error: Error: Error: An error occurred. (-1743)

System I am running on:

• MacBook Air
• Chip Apple M2
• MacOS Sequoia 15.1