Represents the configuration for a text block placeholder. It has the following attributes:

• backgroundColor: takes a Css.Color and represents the background color of the lines.
• height: takes a Css.Px and represents the height of the lines.
• items: a list of integers which is used to randomize the number of lines.

Returns a default configuration for a block placeholder.

Adds items to a Block.

Adds height to a Block.

Adds backgroundColor to a Block.

Inits a block placeholder shuffling its items.

Block msg.

Block update.

Renders a block placeholder using the given configuration.