filter block transforms

gistfile1.txt

const { addFilter } = wp.hooks;
const { assign, merge } = lodash;
const { createBlock } = wp.blocks;

function filter(settings) {
	return assign({}, settings, {
		transforms: merge(settings.transforms, {
			from: [
				{
					type: 'block',
					blocks: ['core/paragraph'],
					transform: ({ content }) => {
						return createBlock('core/heading', {
							content,
							className: 'big-headline',
						});
					},
				},
			],
		}),
	})
	return settings;
}

addFilter(
  'blocks.registerBlockType',
  'test',
  filter,
);