This release includes a number of features we’re happy to announce. You can now run aggregation pipelines that write write to a MongoDB collection using $out and $merge stages on secondaries! We’ve added an option to limit the number of hosts the driver will connect to when using SRV DNS lookups to manage your host addresses. And lastly, the authorizedCollection option is now usable on the db.listCollections() function.
Additionally, in this release, we’ve marked collection.mapReduce() as deprecated. The same functionality can be replicated in the much more flexible aggregation pipeline. Visit Map-Reduce to Aggregation Pipeline to learn more.
The minimum supported MongoDB version is 3.6. Attempts to connect to a MongoDB server older than 3.6 will result in an error.
Please take note of the MongoDB Software Lifecycle Schedules for timeframes of supported server versions.
Features
NODE-3083: support aggregate writes on secondaries (#3022) (f696909)
Hello dear reader, thank you for adopting version 4.x of the MongoDB Node.js driver, from the bottom of our developer hearts we thank you so much for taking the time to upgrade to our latest and greatest offering of a stunning database experience.
We hope you enjoy your upgrade experience and this guide gives you all the answers you are searching for.
If anything, and we mean anything, hinders your upgrade experience please let us know via JIRA.
We know breaking changes are hard but they are sometimes for the best.
Anyway, enjoy the guide, see you at the end!
Key Changes
Typescript
We've migrated the driver to Typescript!
Users can now harness the power of type hinting and intellisense in editors that support it to develop their MongoDB applications.
Even pure JavaScript projects can benefit from the type definitions with the right linting setup.
Along with the type hinting there's consistent and helpful docs formatting that editors should be able to display while developing.
Recently we migrated our BSON library to TypeScript as well, this version of the driver pulls in that change.
Community Types users (@types/mongodb)
If you are a user of the community types (@types/mongodb) there will likely be compilation errors while adopting the types from our codebase.
Unfortunately we could not achieve a one to one match in types due to the details of writing the codebase in Typescript vs definitions for the user layer API along with the breaking changes of this major version. Please let us know if there's anything that is a blocker to upgrading on JIRA.
Node.js Version
We now require node 12.9 or greater for version 4 of the driver.
If that's outside your support matrix at this time, that's okay!
Bug fix support for our 3.x branch will not be ending until summer 2022, which has support going back as far as Node.js v4!
CRUD results
Our CRUD operations now return the drivers-wide spec-compliant results which are defined here:
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Bumps mongodb from 3.7.3 to 4.2.0.
Release notes
Sourced from mongodb's releases.
... (truncated)
Changelog
Sourced from mongodb's changelog.
... (truncated)
Commits
a766f1c
chore(release): 4.2.052520aa
feat(NODE-3729): add withId to default return type for collection.find and co...1f8b539
feat(NODE-3467): implement srvMaxHosts, srvServiceName options (#3031)0709ef2
chore(NODE-3754): bump mongodb-connection-string-url to v2.2.0 (#3038)d9c519e
chore: add our shared vscode settings (#3037)5757fcd
refactor(NODE-3273): remove undefined error param from topology open event (#...b6c73bf
feat(NODE-3446): deprecate mapReduce command (#3036)d5ae78e
feat(NODE-3692): make change stream events typing more generic (#3034)53b3164
fix(NODE-3344): allow settingdefaultTransactionOptions
with POJO rather th...526beb7
docs(NODE-3751): clarify contributing guidelines (#3029)Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
.Dependabot commands and options
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