Type Alias: MoodleErrorCode

type MoodleErrorCode = 
  | "invalid-input"
  | "not-found"
  | "not-available"
  | "outside-site"
  | "unexpected-page"
  | "logout-failed"
  | "chromium-install-failed"
  | "background-browser"
  | "browser-busy"
  | "moodle-url"
  | "browser-not-found"
  | "browser-downloading"
  | "no-display"
  | "not-logged-in"
  | "login-timeout"
  | "login-window-closed"
  | "moodle-service"
  | "form"
  | "activity-settings"
  | "backup"
  | "not-viewable"
  | "not-an-assignment"
  | "grading"
  | "submission"
  | "calendar"
  | "completion"
  | "course"
  | "not-a-forum"
  | "forum"
  | "gradebook"
  | "no-grade-report"
  | "not-an-h5p-activity"
  | "scorm"
  | "workshop"
  | "lesson"
  | "message"
  | "no-participants"
  | "enrolment"
  | "question-bank"
  | "report"
  | "quiz"
  | "choice"
  | "survey";

Defined in: core/errors.ts:6

What went wrong, stable across releases: match errors by code (or by class), never by message, whose wording may change. Each error class has its own code; MoodleError itself takes one of the generic ones.