notfloran/mjml-bundle

config/packages/mjml.yaml

# see https://github.com/notFloran/mjml-bundle#binary
mjml:
    renderer: 'binary'
    options:
        binary: '%kernel.project_dir%/node_modules/.bin/mjml'
        minify: false

config/packages/prod/mjml.yaml

mjml:
    options:
        minify: true