Pre-defined hotkeys are available, while you can also assign custom ones.
A list of pre-defined hotkeys can be found in Node Editor and Hypershade hotkeys. In addition, you can assign custom hotkeys to any of the Hypershade menu and toolbar items, as well as common node graphing functions.
Select Windows > Settings/Preferences > Hotkey Editor to open the Hotkey Editor. Under Edit Hotkeys For, select Editors, and select Hypershade from the list of editors.
All Hypershade menu and toolbar items are listed. Select the command that you want to assign a hotkey to and enter your hotkey shortcut.