@microsoft/fast-element > FASTElementConstructor > define

FASTElementConstructor.define() method

Defines a platform custom element based on the provided type and definition.

Signature:

define<TType extends Constructable<HTMLElement> = Constructable<HTMLElement>>(type: TType, nameOrDef?: string | PartialFASTElementDefinition<TType>, extensions?: FASTElementExtension[]): Promise<TType>;

Parameters

Parameter	Type	Description
type	TType	The custom element type to define.
nameOrDef	string | PartialFASTElementDefinition<TType>	(Optional) The name of the element to define or a definition object.
extensions	FASTElementExtension[]	(Optional) Optional callbacks to run before registration.

Returns:

Promise<TType>