YAML

const store = Nabu
  .configure({
    yaml: { indent: 4 }
  })
  .bootstrap();

import Memory from '@tashmet/memory';
import mingo from '@tashmet/mingo';
import yaml from '@tashmet/yaml';

const store = Memory
  .configure({})
  .use(mingo())
  .use(yaml({ /* configuration options */}))
  .bootstrap();

const data = dedent`
  title: foo
  list:
    - item1
    - item2
`;
const pipeline: Document[] = [
  { $documents: [{ data }] },
  { $set: { data: { $yamlToObject: '$data' } } }
];

const doc = await tashmet.db('test').aggregate(pipeline).next();

{ data: { title: 'foo', list: ['item1', 'item2'] } }

const data = dedent`
  ---
  title: foo
  ---
  Content goes here
`;
const pipeline: Document[] = [
  { $documents: [{ data }] },
  {
    $set: {
      data: {
        $yamlToObject: {
          data: '$data',
          frontMatter: true,
          contentKey: 'body'
        }
      } 
    }
  }
];
const doc = await tashmet.db('test').aggregate(pipeline).next();

{ data: { title: 'foo', body: 'Content goes here' } }

const input = [
  { data: { foo: 'bar' } }
];
const pipeline: Document[] = [
  { $documents: input },
  { $set: { data: { $objectToYaml: '$data' } } }
];

const doc = await tashmet.db('test').aggregate(pipeline).next();