Typoscript file class

Property files. Example: page. Property references. Property collections. Property folders. A combined folder identifier looks like this: [storageUid]:[folderIdentifier]. Property sorting. Description Name of the field, which should be used to sort the files.

Property begin. Description The first item to return. If not set default , items beginning with the first one are returned.

Property maxItems. Background Reading: extends keyword MDN. Classes may extend from a base class. A derived class has all the properties and methods of its base class, and also define additional members. Background Reading: super keyword MDN. A derived class can also override a base class field or property. You can use the super. This can be a problem when you only want to re-declare a more accurate type for an inherited field.

To handle these cases, you can write declare to indicate to TypeScript that there should be no runtime effect for this field declaration.

The order that JavaScript classes initialize can be surprising in some cases. In ES, constructors which return an object implicitly substitute the value of this for any callers of super It is necessary for generated constructor code to capture any potential return value of super As a result, subclassing Error , Array , and others may no longer work as expected. Other downlevel compilers generally have the same limitation by default.

As a recommendation, you can manually adjust the prototype immediately after any super However, any subclass of MsgError will have to manually set the prototype as well. Unfortunately, these workarounds will not work on Internet Explorer 10 and prior. One can manually copy methods from the prototype onto the instance itself i.

You can use TypeScript to control whether certain methods or properties are visible to code outside the class. The default visibility of class members is public. A public member can be accessed anywhere:.

Derived classes need to follow their base class contracts, but may choose to expose a subtype of base class with more capabilities. This includes making protected members public :. Java, for example, considers this to be legal. Moreover, if accessing x through a Derived1 reference is illegal which it certainly should be!

This means that JavaScript runtime constructs like in or simple property lookup can still access a private or protected member:. If you need to protect values in your class from malicious actors, you should use mechanisms that offer hard runtime privacy, such as closures, WeakMaps, or private fields.

Note that these added privacy checks during runtime could affect performance. Classes may have static members. They can be accessed through the class constructor object itself:. Anything, excluding imports, inside a comment section is ignored. Imports within a block comment are still resolved.

Always use single line comments to comment out imports. Comment blocks are not detected inside a multi-line value block see parenthesis operator below. Loading data. This means that abstractly said each line normally contains three parts based on this formula: [Object Path] [Operator] [Value]. Dots in the object path can be escaped using a backslash. Be aware that the value will be trimmed, which means stripped of whitespace at both ends.

This is very useful when a value should be modified without completely redefining it again. This is the list of predefined functions: prependString Adds a string to the beginning of the existing value. Separate these using. There is no check for duplicate values, and the list is not sorted in any way. Optional parameters are: ascending Sort the items in ascending order: First numbers from small to big, then letters in alphabetical order.

This is the default method. Multiple parameters are separated by comma. Blocks can be nested. This is actually recommended for improved readability. Important You cannot use conditions inside of braces except the [GLOBAL] condition which will be detected and reset the brace-level to zero. Note Excessive end braces are ignored, but generate warnings in the TypoScript parser. Important You cannot use multi-line values in constants. An object and its copy.

Another object and its copy. Important When the original object is changed after copying, the copy does not change! Note If the copy operator does not give you any result, then the reason for this behaviour can be a wrong initialization order of the objects.