This tiddler describes the different ways in which [[macros|Macros]] can be defined.
!! Macro Definition Pragma
Macros are created using the [[Pragma: \define]] at the start of a tiddler. The definitions are available in the rest of the tiddler that defines them, plus any tiddlers that it transcludes.
```
\define mymacro(param)
This is the macro text (param=$param$)
\end
```
!! Macro Definition with Set Widget
Macros are implemented as a special type of [[variable|Variables]] and so internally are actually defined with a <<.wlink SetWidget>> widget.
```
<$set name="mymacro" value="This is the macro text">
...
</$set>
```
<<.note """that it is not currently possible to specify parameters when defining a macro with the <<.wlink SetWidget>> widget.""">>
!! Importing Macro Definitions
The [[Pragma: \import]] or <<.wlink ImportVariablesWidget>> widget can be used to copy macro definitions from another tiddler.
The tag [[SystemTag: $:/tags/Macro/View]] is used to define macros that should only be available within the main view template and the preview panel.
The tag [[SystemTag: $:/tags/Macro/View/Body]] is used to define macros that should only be available within the main view template body and the preview panel.
!! JavaScript Macros
Macros can also be <<.js-macro-link "written as JavaScript modules">>.
