> DBRef()
(node:29726) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'toString' of undefined
    at DBRef.asPrintable (/snapshot/cli-repl/node_modules/@mongosh/service-provider-server/node_modules/@mongosh/service-provider-core/lib/printable-bson.js:17:66)
    at formatValue (internal/util/inspect.js:693:31)
    at Object.inspect (internal/util/inspect.js:264:10)
    at inspect (/snapshot/cli-repl/lib/format-output.js)
    at formatSimpleType (/snapshot/cli-repl/lib/format-output.js)
    at Object.formatOutput [as default] (/snapshot/cli-repl/lib/format-output.js)
    at REPLServer.writer (/snapshot/cli-repl/lib/cli-repl.js)
    at finish (repl.js:801:38)
    at CliRepl.<anonymous> (/snapshot/cli-repl/lib/cli-repl.js)
    at step (/snapshot/cli-repl/lib/cli-repl.js)
(node:29726) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:29726) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.