import tsToJoi from 'typescript-schema-to-joi';

    const config = {
        path: './folder/toto.ts', // The path to the file in which the type is
        tsconfig: './tsconfig.json', // The path to your typescript config
        type: 'MyType', // The name of the typ
    };

    const schema = tsToJoi(config);

    const payload = {
      test: true
    }

    const { error } = schema.validate(payload)
    if (error) {
      console.log('invalid format')
    } else {
      console.log('format is valid')
    }

  tsToJoi(
    config,
    true,
    './path/to/write/file.json' // optional third param, it will write the file in the same folder as the type by default
  )