alignments

alignments:Array<Scratch.ArgumentAlignment>

This changes the alignment of different things inside the block.
Add this property to a block as an array, and use the Scratch.ArgumentAlignment object to determine alignment.
There are a few things to note:

• Each argument is an index into the array (so adding hello [ABC] [DEF] will make ABC be the second item in the array, DEF be the third)
• Text counts as an argument (so in the above example, hello is the first item in the array)
• Branches count as arguments (its easier to see the item index for branches by looking at the block on the workspace)

Here is a visual representation:

{
  opcode: 'alignmentTest',
  blockType: Scratch.BlockType.CONDITIONAL,
  text: [
    'this block tests alignments',
    'left',
    'middle',
    'right'
  ],
  branchCount: 3,
  alignments: [
    null, // null or Scratch.ArgumentAlignment.DEFAULT act like no change
    null,
    Scratch.ArgumentAlignment.LEFT,
    null,
    Scratch.ArgumentAlignment.CENTER,
    null,
    Scratch.ArgumentAlignment.RIGHT
  ]
}