How to use the nexus.dynamicOutputProperty function in nexus

buildCRUD(): DynamicOutputPropertyDef<'crud'> {
    return Nexus.dynamicOutputProperty({
      name: 'crud',
      typeDefinition: `: NexusPrisma`,
      // FIXME
      // Nexus should improve the type of typeName to be AllOutputTypes
      factory: ({ typeDef: t, typeName, stage }) => {
        if (typeName === GraphQL.rootNames.Subscription) {
          // TODO Lets put a GitHub issue link in this error message
          throw new Error(
            `t.crud is not yet supported on the 'Subscription' type.`,
          )
        }

        if (
          typeName !== GraphQL.rootNames.Query &&
          typeName !== GraphQL.rootNames.Mutation
        ) {

buildModel() {
    return Nexus.dynamicOutputProperty({
      name: 'model',
      typeDefinition: `: NexusPrisma`,
      /**
       * This factory implements what .model will actually be.
       *
       * If the user's GQL typedef name matches a PSL model name,
       * then we infer that the user is trying to create a mapping
       * between them. This is the implicit mapping case.
       *
       * Otherwise we need the user to specify what PSL model
       * their GQL object maps to. This is the explicit mapping case.
       *
       * In the implicit case we eagerly do the .model implementation,
       * but in the explicit case we return a function in order that the
       * user may specify the mapping.
       *