> [Wiki](Home) ▸ [[API Reference|API-Reference]] ▸ [[Renderer|Renderer-API]] ▸ **Extension**
# Extension
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee)
## Table of contents
* [Extension](#extension)
* [**Class** Extension](#class-extension)
* [when](#when)
* [onWhenChange](#onwhenchange)
* [target](#target)
* [onTargetChange](#ontargetchange)
* [running](#running)
* [onRunningChange](#onrunningchange)
* [enable](#enable)
* [disable](#disable)
* [Glossary](#glossary)
# **Class** Extension
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee)
##when
- Syntax
*Boolean* Extension::when- Prototype property of
- Extension
- Type
- Boolean
##onWhenChange
- Syntax
*Signal* Extension::onWhenChange(*Boolean* oldValue)- Prototype method of
- Extension
- Parameters
- Type
- Signal
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee#signal-extensiononwhenchangeboolean-oldvalue)
##target
- Syntax
*Item* Extension::target- Prototype property of
- Extension
- Type
- Item
##onTargetChange
- Syntax
*Signal* Extension::onTargetChange(*Item* oldValue)- Prototype method of
- Extension
- Parameters
- Type
- Signal
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee#signal-extensionontargetchangeitem-oldvalue)
##running
- Syntax
ReadOnly *Boolean* Extension::running- Prototype property of
- Extension
- Type
- Boolean
- Read Only
##onRunningChange
- Syntax
*Signal* Extension::onRunningChange(*Boolean* oldValue)- Prototype method of
- Extension
- Parameters
- Type
- Signal
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee#signal-extensiononrunningchangeboolean-oldvalue)
##enable
- Syntax
Extension::enable()- Prototype method of
- Extension
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee#extensionenable)
##disable
- Syntax
Extension::disable()- Prototype method of
- Extension
> [`Source`](/Neft-io/neft/blob/8b1b771764f7b63d37551418b52ff56a86d16c1f/src/renderer/types/extension.litcoffee#extensiondisable)
# Glossary
- [Renderer.Extension](#class-extension)