@node types
@subsection types.js

Collection of type information for calendar data.

@defvar all_types
Name of all valid icalendar types.

    text, uri, binary, float, integer, date-time, date, duration,
    period, utc-offset, cal-address, recur, boolean,
@end defvar

@deftp {Data Type} ical_type
The union of all elements in @var{all_types}.
@end deftp

@defvar property_names
All known names properties (top level keys) can have.
Such as ``calscale'', ``dtstart'', ...
@end defvar

@deftypevar {Map<string, string[]>} valid_fields
Which property fields each component can hold.

@verbatim
{ 'VCALENDAR': ['PRODID', 'VERSION', 'CALSCALE', 'METHOD'],
    ...
}
@end verbatim
@end deftypevar

@deftypevar {Map<string, Array<ical_type | ical_type[]>>} valid_input_types
Which types are valid to store under each property.
If multiple values are an option for that property, then
the list of possibilities will contain a sub-list (see example).

@verbatim
{ 'DTSTART': ['date', 'date-time'],
  'CATEGORIES': [['text']],
  ...
}
@end verbatim
@end deftypevar

@deftp {Data Type} tagname
Alias of (@code{'vevent'} | @code{'string'}).
@end deftp

@deftp {Data Type} uid
Alias of @code{'string'}.
@end deftp

@c TODO link to the RFC
@c - RFC 7265 (jCal)

@deftp {Data Type} JCalProperty
Alias for a record consisting of
@itemize @bullet
@item the name of the type, as a string
@item All parameters of the object, as a @code{Record<string, any>}
@footnote{Which is simply a regular javascript object, mapping strings to anything}.
@item An @code{ical_type} value, noting the type of the final field(s)
@item And one or more values of the type specified by the third field.
@end itemize
@end deftp

@deftp {Data Type} JCal
A record consisting of a @code{tagname}, a list of
@code{JCalProperties}, and a list of other @code{JCal} objects.
@end deftp

@defvar xcal
The xml namespace name for xcalendar, which is
``urn:ietf:params:xml:ns:icalendar-2.0''.
@end defvar


@deftp {Interface} ChangeLogEntry
@anchor{ChangeLogEntry}

@ref{VEventChangelog}

@deftypecv {Interface Field} ChangeLogEntry {(@code{'calendar'} | @code{'property'})} type
@end deftypecv

@deftypecv {Interface Field} ChangeLogEntry {string} name
@end deftypecv

@deftypecv {Interface Field} ChangeLogEntry {string?} from
@end deftypecv

@deftypecv {Interface Field} ChangeLogEntry {string?} to
@end deftypecv

@end deftp