Add a etc/config/compiler-explorer.local.properties file
formatters keylib/formatters/<formatter>.js file using the template below, replacing Type and type as appropriateimport { BaseFormatter } from '../base-formatter'; export class TypeFormatter extends BaseFormatter { static get key() { return 'type'; } }
key above corresponds to the type property you set in the compiler-explorer properties configuration file.format(source, options) and isValidStyle(style) as necessary. See the JSDoc for format and the implementations for other formatters to get a further understanding of how to implement format(source, options).Add your TypeFormatter to lib/formatters/_all.js in alphabetical order
You can check the output of http://localhost:10240/api/formats to be sure your formatter is there.
Make an installer in the infra repository. An example patch for adding an installer can be found here