npm / mquery

mquery

What changed in mquery 5 to 6, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-25.

11 breaking1 security5 new APIs and options1 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

mquery 612 changes

count() is removed; use countDocuments() instead.
6.0.0release notes
findOneAndRemove() is removed; use findOneAndDelete() instead.
6.0.0release notes
Calling findOneAndX() with one argument sets the query filter rather than the update, aligning optional arguments with modern expectations.
6.0.0release notes
The minimum required Node.js version is 20.19.0.
6.0.0release notes
Calling updateMany() with one argument sets the query filter rather than the update, aligning optional arguments with modern expectations.
6.0.0release notes
Calling updateOne() with one argument sets the query filter rather than the update, aligning optional arguments with modern expectations.
6.0.0release notes

Operators including in and gte avoid prototype pollution.
4.0.4, 5.0.1, 6.0.1release notes release notes release notes

Adds countDocuments as the replacement for count().
6.0.0release notes
Adds estimatedDocumentCount.
6.0.0release notes
Adds findOneAndDelete as the replacement for findOneAndRemove().
6.0.0release notes
Adds findOneAndReplace.
6.0.0release notes

Filters and updates are no longer merged into inherited properties such as toString.
4.0.4, 5.0.1, 6.0.1release notes release notes release notes

Callback support was dropped; callers must no longer rely on callbacks.
5.0.0release notes
Support for custom promise libraries was removed.
5.0.0release notes
The first parameter is always treated as the query filter; collection ducktyping was removed.
5.0.0release notes
The long-deprecated remove function was removed.
5.0.0release notes
The long-deprecated update function was removed.
5.0.0release notes