Tracks which types of errors can be caught by Sentry.

Coverage for global error handling

See T88874

• Old browsers: message only
• Modern browsers
  • JS cache hit
    • Chrome/FF(/IE?): full stack (see also T90524)
    • Other: message only
  • JS cache miss: no info T508

Coverage for callback wrapping

See T85262 - not merged!, this approach has been abandoned for now.

Error types

• module init: errors occuring when the JS code of the module is executed
• setTimeout: error in a setTimeout/setInterval callback
• $.ready: error in a jQuery onready handler ($(handler))
• $.event: error in a jQuery event handler ($elem.click(handler) etc)
• $.ajax: error in a jQuery AJAX callback
• misc cb: error in an event handler / callback which is none of the above (e.g. native handler via addEventListener, native AJAX callback) - these should be caught via window.onerror
• mw.loader: error in an mw.loader callback which is swallowed by ResourceLoader
• CSS: error when styles are added by ResourceLoader via the IE compatibility hack (T33676)